ctronic hnic · 2019-07-17 · ctronic hnic including 16 pages of latest circuit digests...

CTRONICHNIC

including 16 pages of latest

CIRCUIT DIGESTS

MILLIROENTGENS/HOUR

ELECTR C DEVICES DETECT RADIATION

0 (I f

ALSO IN THIS ISS E:

Whipping TV Transformer Problems

How to Install FM Au -o Converters

113)13V!grits!I 10 MARCH 1962

.34

3,516,032facts of life!

At Seneca Falls, New York, Ottawa,Ohio, and Fullerton, California-whereSylvania manufactures picture tubes-engineers give Silver Screen 85's hoursupon hours of severe performance andlife tests. Tubes taken at random fromproduction lines are actually operatedin commercial TV sets typical of thoseyour customers own. Additional tubesare placed in specially designed life testracks, where operating conditions areeven more severe than in normal re-ceivers. In this way, Sylvania gets allthe facts of tube -life. These facts pro-vide the feedback data that are essen-tial to a continuing program of pro-ducing top-level quality picture tubes.

What is the significance of 3,516,032?This is the number of hours of severelife testing to which Silver Screen 85'swere subjected in the year 1961! Cov-ering some 120 tube types, these over31/2 million life test hours assureSylvania and you that Silver Screen 85picture tubes remain second to none inlife and sustained top performance. Itis your most reliable assurance of nocostly callbacks due to premature pic-ture tube failure, or complaints ofunsatisfactory picture performance.Remember Sylvania's 3,516,032 hoursof quality monitoring-they can meanmore profits for you.

Electronic Tubes Division, SylvaniaElectric Products Inc., 1740 Broad-way, New York 19, N. Y

Syllania Silver Screen 85 -available wherever there is TV.

SYI'Asin soi+Av of

TANIAGENERAL TELEPHONE &ELECTRON/CS"`4,

ALL PARTS

SENCORE

A new day is dawning in electronics. Tstay ... they are now being used everywhere; in radio, television, Hi-Fi,intercoms, and in nearly all new electronic equipment...

Why put off transistor circuit servicing any longer...there's gold in them thar hills. But you must beequipped to do the job fast and efficiently. Here arethe tools that you will need.

NEW SENCORE TRANSI-MASTERThis Tester will analyze the entire circuit in minutes and test transistorsin -circuit or out of circuit. Here is how you can pin point troubles stepby step.First, check the batteries with the 0 to 12 voltmeter. If the batteries areO.K., check the current drain with the 0 to 50 milliamp meter. A specialprobe is provided so that you do not need to break the circuit. Excessivecurrent indicates a short; low current indicates an open stage or crackedboard. All PF schematics indicate average current.If trouble is not located by now, isolate the trouble to a specific stageby touching the output of the harmonic generator to the base of eachtransistor and note spot where sound from speaker (or scope where nospeaker is used) stops or becomes weak. The generator becomes a sinewave generator for audio stages to help find distortion.If trouble points to a transistor, check it in a jiffy with the exclusivein -circuit power oscillator check provided by the TR110. A special probeis also provided for this.If the transistor checks had in -circuit, remove it and give it an out ofcircuit check with the oscillator check or the more accurate DC check.The DC check is provided for comparison reasons, experimental or engi-neering work and to match transistors in audio outputstages. Beta (current gain) is read direct or on a good -bad scale for service work. DEALER NET. ONLY $ 4 950

MAND DIODE CHECKERNEW SENCORE TRANSISTOR

Here is a low cost tester that has become Amer-ica's favorite. The TR115 provides the sameDC out of circuit checks as the TR110; leakageand current gain. Beta (circuit gain) can alsobe read direct or as good or bad. Opens orshorts in the transistor are spotted in a minute.The TR115 checks them all from power tran-sistors to the small hearing aid type. Japaneseequivalents are listed also. This famous testeris used by such companies as Sears Roebuck,Bell Telephone and. Commonwealth Edison.New circuits enable you to make service checkswithout set-up charts even though charts areprovided for critical checks.

Model TR115Dealer Net

$1995

Now in stock atyour AuthorizedSencore Distributor

MADE IN AMERICA

Tests all transistorsin -circuit or out -of -circuit

Model TR110It's a COMPLETE TRANSISTOR TESTER SIGNAL TRACER VOLTMETER BATTERY TESTER MILLIAMMETER

SENCORE BATTERY ELIMINATORAND TROUBLE SHOOTER

For replacing batteries during repair.Many servicemen say that they wouldn't serv-ice transistor circuits without this power supply.The tried and proven PS103 is a sure fireanswer. It can be used to charge the nickelcadmium batteries as well. Dial the desiredoutput from 0 to 24 volts DC and read onmeter. Low ripple insures no hum or feedback.Total current drawn can also be read on thePS103 by merely flicking the function switchto milliamps. The PS103 is the only supplythat will operate radios with tapped batterysupplies such as Philco, Sylvania and Motorola.No other supply has a third lead.

4\

Model PS103Dealer NetS1995

MARCH 1962

- - - for more details, circle 48 on page 50

3

in the wonderful

AD 3989

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Nylon Bag, GlovesClutch style purse with gold fin-ished chain. Nylon palm stretchgloves to match. Black only.FREE with $60 worth of purchases

Fitted Travel CaseFor the ladies. Scuff resistant vinylcovering, fitted with JeweliteNylon brush, comb and mirror set.FREE with $125 worth of purchases

Ronson CFL Shaver1962 Mark II Electric Shaver.323.50 value. Mu'ti-blade miraclecutter gives quickest shaves.FREE with S250 worth of purchases

Redwood and AluminunFoam CushionCHAISE

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tired wheels, plastic covered 2' chi(soft poly -foam cushion. 3 position

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$415 WORTHRCHASES . . .

$25 LESS WITH BONUS CHECK- - - for more details, circle 38 on page 50

MANY OTHER OFFERS NOT SHOWN

Men's Ban -Lon SoxFirst quality, 100% Ban -Lon yarn,reinforced top and heel. Stretchtype, fits sizes 10 to 13.FREE with $12 worth of purchases

AD 3986

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FREE with $225 worth of purchase

SEE YOUR PHILCO DISTRIBUTOR TODAY .. . SELECT YOUR FREE GIFTS NOW .. . PROGRAM ENDS APRIL 30t

HOWARD A. REED

ALBERT J. FORMAN

ARTHUR P. SALSBERG

JACK HOBBS

VIC BELL

B. V. SPINETTA

HERB HOENE

EARL HINTZ

Publisher

Editor

Managing Editor

Technical Editor

Associate Editor

Assistant Editor

Circulation Manager

Production Manager

it? AN OJIBWAYPUBLICATION

`CY

OJIBWAY PRESS, Inc.1 East First StreetDuluth 2, Minn.

Telephone: RA 7-8511

Saks Offices:

NEW YORK: Ron Kipp, National SalesManager, 480 Lexington Ave., NewYork 17, N. Y. TN 7-0011

CHICAGO: William Klusack, 221 N.LaSalle St., Chicago 1, Ill. CE 6-1600

CLEVELAND: Bernie Edstrom, 15605Madison Ave., Cleveland 7, OhioLA 1-7900

LOS ANGELES: Boyd B. Garrigan,1145 W. Sixth St., Los Angeles 17, Calif.HU 2-2838

ELECTRONIC TECHNICIAN and Circuit Di-gests, published monthly at 1 East FirstStreet, Duluth 2, Minnesota, by OjibwayPress, Inc., Marshall Reinig, president; Robart Edge'', executive vice president; Law-rence Rosenthal, vice president; H. B

Fryberger, Jr., y, E. A. Kuefner,treasurer. Single copies, 60c. Subscriptionrates: United States and Canada S5 forone year; S8 for two years; SIO for threeyears. Pan American and Foreign countries,S9 for one year; S14 for two years; S18for three years. Application for second classre-entry pending at Waseca, Minn. Copy-right 1962 by Ojibway Press, Inc., Duluth,Mirn. Reproduction and reprinting prohibitedexcept by written authorization of publisher.POSTMASTER: SEND NOTIFICATION tForm35791 TO ELECTRONIC TECHNICIAN, 1 EASTFIRST STREET, DULUTH 2, MINNESOTA.

ELECTRONICECHNICIAN

Including

SERVICEMagazine

WORLD'S LARGEST ELECTRONIC TRADE MAGAZINE

March 1962 Vol. 75 No. 3

FRONT COVER Radiation cannot be observed by iuman senses. Consequently, devices areemployed to detect it, such as specially treated material that changes color to indicate"danger" or instruments that buzz or can be read on a meter. The latter two are of interestto us since they are electronic devices and measure amount of radiation as well as "danger."Circuitry and operation of these instruments are discJssed starting on page 26.

FEATURES and ARTICLES

"Tuning in the Picture" 14

TV Manufacturers Technical Digest 18

Electronic Devices Detect Radiation 26by Allan Cantor

Whipping TV Transformer Problems 30by Jack Hobbs

"Tough Dog" Corner 33by Frank Salerno and Thomas Gregg

Troubleshooting Hi Fi Tone Controls 34by Monnie Horowitz

New Test Instruments for Bench and Caddy 38

TV Industry Advertising Guide 40

DEPARTMENTS

Editor's Memo

Letters to the Editor

Calendar of Coming

ET Viewpoint

Technical L brary

Shop Hints

Events

CIRCUIT DIGESTS

8 Free Literature 50

10 New Products 52

15 News of the Industry 60

25 Catalogs and Bulletins 62

42 Audio News Letter 63

46 Association News 64

New Books 74

PRECEDING BACK COVER

IN THIS ISSUE( 6 pages latest schematics and data)

ELECTROHOME: TV Chassis CHT-213-611

EMERSON: TV Chassis 120507A,-88, 120515C, -16D, 120541C, -42D

FISHER: FM Stereo Tuner Model 800

MONTGOMERY -WARD: TV Models WG-4234A,NG-4334A

TRAVLER: TV Chassis 1156-89

ZENITH: TV Chassis 16J2805

PVC

TC TUBULAR ELECTROLYTICS

Economical filter capaci-tors. Also special TCXtype for -55°C. Twin -pack keeps leads free fromkinks.

FP ELECTROLYTICS

Original 85°C capacitor,now better than ever.Etched cathode gives hum -free performance. Chassisor printed circuit mounting.

STA-LOC® CONTROLS

End searching and waiting.Your distributor can cus-tom -build, in just 30 sec-onds, any of over 38,000,000single or dual controls.

GOLD LABEL® VIBRATORS

Quietest ever made . . . forthe best in auto radio ser-vicing. Buttonless contactdesign gives longest trouble -free service.

*Advt. No. 9-2-5100-2 facing pages, 2 colore-PF Reporter-March, 1962Electronic Technician-March, 1962

6 ELECTRONIC TECHNICIAN

STOPCALL-BACKSWITHMALLORYPVC MYLAR*CAPACITORS

Best thing about Mallory PVC coupling and by-passcapacitors is that you can install 'em and forget 'em.They won't drift, won't pop out. Not even when youput them in a hot spot, load 'em up to full voltage (oreven higher). Not even when the weather stays hot andwet for months. Here's why.

All Mylar dielectric. Not a combination of paper andMylar that invites moisture absorption and causesvoltage failure and capacitance drift. There's nothingbut Mylar between capacitor foils. And you know that'sthe most moisture -impervious dielectric used today.

Performance -plus. Use PVC's at any ambient from-40 to +105°C . . . no need for derating. Push themup to full rated voltage. They've been tested at twicethe voltage marked on 'em. They won't drift . . . nodanger of a call-back to fix a sweep circuit that won'thold sync.

Foolproof leads. Flexible PVC case lets you bendleadwires at sharp angles without breaking themoisture seal.

Small and handy. Rating for rating, Mallory PVCMylar capacitors are almost one-third smaller thanother capacitors. And they're furnished in a handy,zip -close reusable package.

There's a wide range of ratings, priced lower than you'dthink possible for so much quality. Get Mallory PVCMylar capacitors-and all other Mallory quality com-ponents-from your Mallory distributor.Registered Trademark of E. I. du Pont de Nemours & Co., Inc.

Distributor DivisionIndianapolis 6. Indiana

P. R. Mallory & Co. Inc. MALLORY

MALLORY RMC DISCAPSR

Ceramic capacitor replace-ments...tops for customersatisfaction. Long the qual-ity standard in originalequipment.

MALLORY MERCURY BATTERIES

Tops for transistor radios.Steady power, up to 3 timeslonger service ... they livefor years when idle. Guar-anteed leakproof.

GEMS

Rugged, moistureproof tubularcapacitors. Handy five -packkeeps stock clean, leadskink -free.

MARCH 1962


7

MAKING ROOM AT THE TOPAC VTVM & AMPLIFIER #250

, L NEW ::::-3i= Kit $49.95 Wired $79.95

Phenomenally good AC VTVM, bound to,

make room for itself at the top of the pro-NI NI WI fessional market. 12 ranges from 1 my to

..... V Tf OIRCIl 300 V full-scale, 10c-600kc ±0 db response,10 megohms input impedance, ±3% of fullscale accuracy. At the flick of a switch, theinternal wide -band amplifier is available forexternal use. Provides 8c-800kc ±0 db re-., --43:1:3 ' 1-.1 sponse, 5 VRMS output, 5 kilohm output

Regulated power supply, frame grid tubes.0 Itipimpedance, gain control, noise -40 db.

., AC VTVM #255Kit $44.95Wired

$72.956 40 00 All the precision VTVM facilities of the #250, less

the external use of the wide -band amplifier.

ARMED TO TitiiiiiL .1

a.....----..,ir.

TEST LEADS

ANSISTOR GAMEall-HilliTRANSISTOR GAMEt,

IV. it

KitMeasurespecial settings-plusto serviceprovidesurements.transistor

TRANSISTOR AND CIRCUIT$25.95

ICEO, ICBO & dcfl directly, acB indirectly,all dc volts, currents, and

transistor equipment. 50 µA, 31/2" facesensitivity and scale length necessary

Built-in 20,000 ohms/volt VOM facilitiesequipment with minimum equipment

TESTER #680Wired $39.95

without charts orresistances needed

meter movementfor accurate meas-

let you work ontie-up.

Nar,Call SITTING DUCKPrillialD

FOR THIS SNOOPER ----t-D

.......m.wismigti _ . . _..._

ti) - iiiir....-4.0IN-CIRCUIT CAPACITOR TESTER #955Kit $19.95 Wired $39.95

Leave those capacitors where they are! Without unsoldering:-check for shorts (even in the presence of as little as 1 ohm shunt

resistance)-check for opens (determine the presence of as little as 5mmf

the circuit), and to confirm open indication ...-measure capacitance with ±10% accuracy between 0.1 mf

50 mf-measure RC product, convertible into dissipation or power factor.

in

and

Also New

MlleFrom EICO:

Battery ' MSEliminatorand Charger#1064 i

Kit $43.95Wired $52.95

AC BenchSupplies:Model 1073-Kit $35.95Wired $47.95Model 1078-Kit $42.95Wired $54.95

0 41

AC Volt -WattMeter #260Kit $49.95Wired $79.95

EICOw ,F,otraeconsmpraledt,e.,chaatamloggeoa: ovpelursenoamEleCOof kits anddw:srterd.buutzts-w,h,;:liotedsetpet.qui:73nt,

/ ELECTRONIC INSTRUMENT CO., INC., 3300 N. BLVD., L. I. C. 1, N. Y.Add .5% in the West Export Dept: Roburn Agencies, Inc. 431 Greenwich St., N. Y. 13, N. Y.

EDITOR'SMEMO

It's not unusual for customers to com-plain that TV sets are unreliable. Re-liability, of course, is a relative thing.

Because electrical and electronic de-vices utilize such intricate parts whichdemand very critical performance, theirreliability cannot be measured in termsof relatively simple devices.

To indicate that these problems arenot limited to the radio -TV field, con-sider the fairly complex construction ofan automobile. Besides the engine, au-tomatic transmission, steering and dif-ferential, there are many other mechan-ical linkages. Yet it is the electricalsystem which is the biggest headache.

The American Automobile Associa-tion, for example, reports that of the65,000,000 car service distress calls re-ceived during a year. some 38%, or25,000,000 of these calls, are attributedto failures in the electrical system. Andremember, the automobile electrical sys-tem is not nearly as complex as a TVreceiver.

Further evidence of reliability prob-lems being inherent in electrical andelectronic equipment are the all toofrequent failures in some of our guidedmissiles. Here, despite the most ad-vanced engineering, despite the fact thatno cost is spared, failures still occur.It's in the nature of the beast.

When one considers that TV setshave improved substantially over thepast 15 years, it is to the industry'scredit that this accomplishment has beenaccompanied by a decrease in price.Nowhere else can the consumer buysuch a wealth of entertainment in suchan intricate unit for, perhaps, $200.

I think it is a feather in the cap ofthe TV service industry that in spiteof built-in limitations, technical prob-lems and financial difficulties, at anyone time the public has over 98% ofits TV sets in suitable condition foroperation.

So we ought to be grateful for littlethings at least.

Think of the woman who bought aparrot, and after having him in thehouse for a day, returned him to thestore complaining that the bird was un-desirable. It spouted a steady stream ofprofane language.

The petshop owner told the womanthat she should not be unhappy withthe parrot because of this one smallshortcoming. After all, the bird did notsmoke, drink, gamble or run after wildwomen!

cteSEE US AT IRE BOOTH NO. 3701

- for more details, circle 21 on page 508 ELECTRONIC TECHNICIAN

SERVIa

\IECIATICIPS

CAN YOU SOLVE THIS MYSTERY?(Using the clues below, identify the Company that offers you the industry's best service)

Service technicians-and set manufacturers, as well-use this company's capac-

itors oftener than any other brand.

Providing the right sizes, styles, ratings, mountings, this company offers the

industry's most complete capacitor line.

Replacements for new capacitors in latest model sets are promptly made avail-

able to the service technician.

A continuous research program, employing a staff of over 500 scientists, engi-

neers and technicians, assures our ability to keep up with new capacitor needs.

Guaranteed for performance and dependability, every type of capacitor wemake is double-checked by our rigid quality control program.

Unequalled service aids include replacement guides, wall charts, service manuals,

capacitor calculators, and other technical helps which simplify your job ofcorrect capacitor selection and replacement.

Effective posters and advertising mats are available to you as part of ourcustomer relations program for dealers.

WHO ARE WE ? If you still don't know the answer, read the initial letterof each of the sentences above. This is the name that stands for the most com-

plete and best quality line of capacitors, unsurpassed service help, continuedtechnical assistance-and less call-backs for our friends, the service technicians.

- for more details, circle 51 on page 50

MARCH 1962 9

I'd walk a mile.

forL & T Pad Attenuators

I'm not an ordinary camel-I'ma thinking man's camel-and Ithink highly of Centralab L & T PadAttenuators.

These units work good-like anL & T Pad should-because of theirsmall size, high wattage, and anti -backlash construction. Measuring lessthan 1X6" deep from the mountingsurface, and with 1%" diameter, theyfit into any standard junction orswitch box with room to spare.

In L & T Pads, though, it's what's in back that counts-and these Centralabunits have exclusive "thermo-pass" insulation, which combines fast heattransfer with a high dielectric constant to achieve a conservative rating of20 watts audio, 5 watts D.C., in a unit the size of conventional 2 watt controls.

Because of Centralab's anti -backlash construction, the "play" frequentlyfound in dual controls is eliminated. The wiper contacts move in unison,so there's no alteration in frequency response due to variations in wiperposition on the resistance tracks.

So hump down to your Centralab distributor and stock up on these L & TPad attenuators. They satisfy!

B -6205S

CenttAlaixTHE ELECTRONICS DIVISION OF GLOBE -UNION INC.

902C EAST KEEFE AVENUE MILWAUKEE 1, WISCONSIN

In Canada: Centralab Canada Ltd., P.O. Box 400, Ajax, Ontario

ELECTRONIC SWITCHES VARIABLE RESISTORS CERAMIC CAPACITORSPACKAGED ELECTRONIC CIRCUITS ENGINEERED CERAMICS


LETTERSTO THE EDITOR

Radiation InstrumentsEditor, ELECTRONIC TECHNICIAN:

Radiation measurement instrumentsare beginning to get into the customer'sbands. Please publish an article on un-derstanding and servicing these units.A technician should study radioactivemonitoring as a service to himself andthe country.

WILLIAM H. ANTHONYWashington. D. C.

Electronic technicians can certainlyplay a vital role in civilian defense.The cover story article in this issue onradiation detection devices should be anaid in the national effort, and opennew earning opportunities for interestedservice dealers.-Ed.

Foreign Tube ReplacementsEditor. ELECTRONIC TECHNICIAN:

I have a "Philips," of Holland radioin for repair. The Model No. is B3X66Uwith a tube complement of UCH81.UF89, UY42, UL84, UBC81. I checkedthese on my tube checker and the lasttwo are bad. I cannot find any Ameri-can tube listed as a substitute, andcannot find out where to order the ex-act replacements.

I would appreciate any help ypu cangive me on this.

ARTHUR D. ERICKSONSt. Paul, Minnesota

The tube typeForeignUCH 81OF 89UY 42UL 84UBC 81

equivalents are:U. S.19D8I2DA655N345B5

All are US equivalents except the lastwhich does not have one. The foreigntubes or equivalents can be purchasedfrom: Amperex Electronic Corp., 230Duffy Avenue, Hicksville, New Yorkand International Electronics-MullardCorp., 81 Spring Si., New York 12,New York.-Ed.

Sensitive SensitivityEditor, ELECTRONIC TECHNICIAN:

In November's article, "ReplacingComponents in Transistor Radios," sec-ond paragraph on page 46, AnthonyStern used sensitivity instead of selec-tivity. This made his paragraph incor-rect. You see, the lower the sensitivityfigure, the better the receiver and thegreater its ability to bring in distantor weak stations. Mr. Stern used theword sensitivity in the opposite fashion.The word to make his paragraph cor-rect is selectivity, not sensitivity. Se -


MN TRANSISTOR RADIO ANALYSTmakes it Easy and Profitable to Service all Transistor Radios

TRANSISTOR RADIO ANALYST

with Exclusive DYNA-TRACESingle -Point Probe-and Built-in

Metered Power Supply and VTVM

Complete Transistor RadioService Shop in One Instrument

Signal -Generator, Power Supply,Milliammeter, VTVM, Battery Tester,Ohmmeter, and Both In -Circuit andOut -of -Circuit Transistor Tester-

All in One

circuits - FutpoimtcuAy Vioub ... bit Kim&Now you can profit from transistor radioservicing! This amazing new B&K "960"ANALYST gives you everything in one com-plete easy -to -use instrument. Makes tran-sistor radio servicing quick and easy. Nothingelse is needed except the transistor radiosthemselves waiting to be serviced. Bringsyou new customers for service, parts, andbatteries. Makes this new business yours.

EASILY TROUBLE -SHOOT ANY STAGEBY UNIQUE POINT-TO-POINT SIGNAL INJECTION

The ANALYST gives you a complete signal -generatingsource for point-to-point signal injection. Easily enables youto trouble -shoot any transistor radio-check all circuitsstage-by-stage-isolate and pinpoint the exact trouble inminutes.Supplies modulated signals, with adjustable control, tocheck r.f., i.f., converter, and detector. Supplies audio signalto check audio driver and audio output. Provides unmod-ulated signal to teat local oscillator. Provides separate audiolow -impedance output for signal injection into loudspeakervoice coils to check speaker performance.

BUILT-IN METERED POWER SUPPLY FOR EASY SERVICING

Makes it easy to operate radio under test, while you injectyour own signals. Provides from 1 to 12 volts in 1 2 voltsteps. Supplies all bias taps that may be required.

SIMPLIFIES IN -CIRCUIT TRANSISTOR TESTWITH NEW DYNA-TRACE SINGLE -POINT PROBE

Unique single -point prcbe needs only the one contact totransistor under test. No longer are three wires required toconnect to emitter, base, and collector. Gives fast, positivemeter indication. Saves time. Makes trouble -shooting simpleand easy.

BUILT-IN VTVM

Includes high -input -impedance vacuum -tube voltmeter,which is so necessary for transistor radio servicing.

TESTS ALL TRANSISTORS OUT -OF -CIRCUIT

Meter has "Good -Bad" scale for both leakage and beta.Also has direct -reading Beta scale, calibrated 0-150. Assuresquick, accurate test. Also automatically determines whethertransistor is NPN or PNP. Meter is protected against acci-dental overload and burn -out.

Model 960. Net, $9995

Solve Every Service Problem and Profitwith a Modern B&K Service Shop. See YourB&K Distributor or Write for Catalog AP18T

Bak MANUFACTURING CO.1801 W. BELLE PLAINE AVE CHICAGO 13, ILL.Canada. Altos Roeto Corp., 50 Wingold, Toronto 19, Ont.Export. Empire Exportrs, 277 Broadway, Now York 7, U.S.A.

MARCH 1962

- - for more details, circle 12 on page 50

II

SILICON

Tarzian 400 and 600 volt F and H seriesunits are available in handy Ten-Paks,in Doubler Replacement Kits, and inbulk; M150 and M500 units are avail-able in Conversion Kits and in bulk.Nine standard tube replacement recti-fiers replace over 95% of all popular

vacuum tube rectifiers; S5347 replaces6BW4 or 12BW4 in Citizen's Bandradios; your 50 to 500 ma requirementsare covered by four "condensedstack" selenium rectifiers, whichSarkes Tarzian has made more effi-cient-and smaller-than before.

Sarkes Tarzian...the preferred silicon rectifiers

that mean fewer call-backs Tarzian silicon rectifier dependability virtually eliminatescall-backs that waste your time and profits. Units are availableimmediately from distributors throughout the country ... in theshapes, sizes, and specifications you need to do your workquickly and easily.

Tarzian's industry -wide reputation for high quality at a pace-setting low price is a basic reason why more technicians likeyourself prefer Sarkes Tarzian rectifiers than the next two mostpopular makes combined.

That statement is firmly based on the results of a 1961 mail-ing by Brand Name Survey, an independent research organiza-tion, to 23,000 service technicians in all major market areas ofthe United States, covering 36 states. You're in good company-and lots of it-when you make Tarzian rectifiers your firstchoice for replacement applications.

Free Tarzian "Distributor Line" catalog is available nowas your guide to replacement rectifier quality. Ask yournearest Tarzian distributor for your copy.

SARKES TARZIAN, INC.World's Leading Manufacturers of TV and FM Tuners Closed Circuit TV Systems Broadcast

Equipment Air Trimmers FM Radios Magnetic Recording Tape Semiconductor Devices

SEMICONDUCTOR DIVISION BLOOMINGTON, INDIANAIn Canada: 700 Weston Rd., Toronto 9 Export: Ad Auriema, Inc., New York


I

LETTERS Ank

TO THE EDITOR

lectivity is the ability of the receiverto bring in weak stations without in-terference.

DAVID CRUMPTON

Brooklyn, New York

The author was referring to sensi-tivity, rather than sensitivity rating orfigure. With a loss of sensitivity, thesensitivity rating increases (that is, moremicrovolts are required at the antenna).Incidentally, as the sensitivity loss be-comes greater, the band pass peak islower, thereby broadening the responsecurve and affecting the selectivity. Justkeep in mind that the more sensitive areceiver is, the lower its sensitivity rat-ing.-Ed.

Manufacturer Address

Editor, ELECTRONIC TECHNICIAN:

Can you give me the name of themanufacturer of the Seco VT Grid Cir-cuit Tester? The address is Seco Electronics, Inc.,5015 Penn Avenue South, Minneapolis19, Minn. All manufacturer addressesare listed in the annual May Directoryissue.-Ed.

Evaluating UHF

Editor, ELECTRONIC TECHNICIAN:

I cannot help commenting on youreditorial in the December issue of ETconcerning the FCC and UHF television.For several years in New Orleans wewere in the position of having twonearby UHF stations, Channel 61, whichlater changed to Channel 20, then fin-ally to Channel 13. This gave us, andother TV servicemen quite an oppor-tunity of evaluating UHF versus VHFin both communities.

Personally, in the immediate servicearea (20 odd miles) I consistently foundUHF vastly superior to VHF TV iftwo important considerations were takeninto account. First, the TV receiverwhich was mainly a matter of whichmanufacturer and secondly, the antenna.

It would seem to me that if theFCC makes the drastic decision to re-turn UHF to the American public, thisis a step in the right direction, pro-vided that the industry maintain properengineering. The failure of UHF layprimarily in the lack of public accept-ance, which was due to faulty engineer-ing of the products. Of course, the serv-ice technician got the blunt of theblame.

Being a radio engineer and physicistmyself, I was able to evaluate the prod-ucts. Some manufacturers would show agood picture and good sound with aslittle as 50 microvolts of signal from anindoor antenna. Other sets would re-

Continued on page 16

12ELECTRONIC TECHNICIAN

TESTSAll TV and Radio

Tubes-Old and New

TESTSthe New 10 -Pin Tubes

TESTSEuropean Hi-Fi Tubes,

Voltage Regulators, andMost Industrial Types

NEWESTFINEST

MONEY-MAKERfor Professional

Servicemen

TESTSthe Nuvistors

TESTSthe New 12 -Pin

Cornpactrons

TESTSfor True Dynamic

Mutual Conductance (Gm)

OBSOLESCENCEPROOF

Designed fcr MaximumUse Today and

Tomorrow

Multiple -Socket Speed

with Gm Accuracy PLUSOBSOLESCENCE

Model 100DYNA-QUIKFastest, Most Complete

Most Up -to -Date

DYNAMICMUTUAL CONDUCTANCE

TUBE TESTER

See your B&K Distributor,or Write for Catalog AP18-T

TESTS BOTH OLD AND NEW TUBE TYPES-SELLS MORE TUBES PER CALL

Again you benefit from proved B&K techniques! This up-to-date, obso-lescence -proof, professional instrument is designed for maximum usetoday and tomorrow. Provides multiple -socket section to quick -checkmost of the TV and radio tube types the true dynamic mutual conductanceway-plus simplified switch section to check new tube types in Dyna-Quik emission circuit. Also includes provision for future new sockets.

Makes test under set -operating conditions. Checks each section ofmulti -section tubes separately. Checks fcr all shorts, grid emission,leakage and gas. Makes quick "life" test. Exclusive adjustable gridemission test provides sensitivity to over 100 megohms.

Makes complete tube test in seconds. Checks average set in a fewminutes. Discovers weak tubes that need replacement. Satisfies morecustomers. Sells more tubes. Saves call-backs. Insures your reputation.Patented automatic compensation for line voltage variation. Large 434' plasticmeter with easy -to -read "Replace -Good" scale. Lists most commonly used tubetypes with settings directly on socket panel for fastest operation. Completelisting in reference chart in cover. Phosphor -bronze contacts for long life. 7, 9,and 10 -pin straighteners on panel. Operates on 117 volts 50-60 cycle a.c. Hand-some leatherette -covered carrying case.Size: 16N" x 15W x 57i" deep. Net wt: 1534 lbs. Net, $16995

NEW TUBE INFORMATION SERVICEAvailable every 3 months, on subscription,

for all B&K Dyna-Quik Tube Testers

BILK MANUFACTURING CO.1801 W. BELLE PLAINE AVE CHICAGO 13, ILL.Canada' Atlas Fadio Corp., 50 Wingold, Toronto 19, Ont.Export: Empire Exporters, 277 Broadway, New York 7, U.S.A.


MARCH 1962 13

CUSTOMERS NO LONGER PAY for removal andre -installation of Motorola car radios during the oneyear warranty, said C. 1. "Red" Gentry, Car RadioSales Manager in introducing their new line. In thepast customers have had to pay if the set needed to beremoved for repair during the warranty period. Thisexpense will now be borne by the factory, accordingto Gentry, thus freeing dealers and distributors fromthis expense.

COLOR TV studies are continuing at Westinghouse,but the company has no firm plans for marketing acolor receiver during 1962, according to 0. H. Yoxsi-mer, TV -radio division general manager. He said theybelieve color TV is an increasing factor in TV receiversales, probably accounting for three percent of total1961 TV receiver sales.

TV RECEIVER factoryto rise by more than 300,000 units over the total sold

COLOR CRT PRODUCTION

Solder application machine helps accelerate production of color CRT'sat RCA's $10 million Lancaster, Pa. plant, where $1.5 million expan-sion program is underway to meet anticipated 250% increase in1962 demand. The machine spreads a thin ribbon of special glass -sealing solder to the edge of a 21 -inch type CRT envelope while itis rotating.

"Yes, we can blue you terms. How about 27 dollars down and 25cents a month for the next two months?"

in 1961, and sales of radio sets and phonographs mayremain at about the same levels as last year, accordingto estimates released by EIA. Estimates for 1962: TVReceivers, 6,201,000; Radio, 11,463,000; Phono-graphs, 3,915,000. Although firm statistics for 1961factory sales are not yet available, EIA estimates totalsas: TV Receivers, 5,900,000; Radio, 11,500,000;Phonographs, 3,900,000.

ONE -GUN COLOR CRT by Paramount PicturesCorp. under consideration by domestic and foreign TVset manufacturers. Sony Corp. of Japan has just beenlicensed and will be the first to make and use the tubefor entertainment purposes.

THREE OUNCE RADIO, reportedly world's smallestseven -transistor receiver, is made by Standard RadioCorp. of Tokyo. The "Micronic Ruby" measures1-9110 inches by 1-7110 inches by 8110 inches, aboutthe size of a flameproof pocket cigarette lighter. Retailsat about $22 in Japan and will be introduced in theUnited States this spring.

AUDIOPHILES BECOME HAMS. "It's no secretthat amateur radio operators were among the earliest


hi-fi fans," says Bill Colbert, president of Audio Ex-change Stores, Inc., a New York hi-fi sale chain."Today, the average Ham is bound to be interestedin hi-fi and every hi-fi enthusiast is a potential Ham.It's come the full circle." The firm has, therefore, de-veloped a unique "4 -Way Trade -In" system for trad-ing equipment: hi-fi for Ham; Ham for hi-fi; Ham forHam; and hi-fi for hi-fi.

"COMPACTRON" TRADEMARK ABANDONEDby the General Electric Co. The trademark, as appliedto multi -function electronic devices, is now in thepublic domain. L. Berkley Davis, vice president andgeneral manager of G -E's electronic components divi-sion, said the general acceptance and use of the termby the public has caused its loss of distinctiveness asan indication of origin of goods. He

FOGHORN FOR BLIND

A "foghorn for the blind," has been developed by Standard Tele-phones and Cables Ltd., ITT British affiliate. Sound from a special,transistorized, high -frequency dog whistle, blown by the blind person,is selectively picked up by a microphone on the device anda self-contained bell to sound. The direction and intensity of thebell's sound enables the blind person to estimate his position inrelaion to the known location of the device. The range of thedevice is about 60 yards.

Mar. 20-25:

Mar. 21-23:

Mar. 26-29:

Mar. 28-31:

Apr. 1-4:

Apr. 11.13:

Apr. 29-30:

May 21-24:

CALENDAR OF COMING EVENTS

1962 Los Ange es High Fidelity Music Show, Instituteof High Fidelity Manufacturers, Inc. (IHFM) AmbassadorHotel, Los Angeles, Calif.

9th Annual Spring Convention and Technical Sessions,Audio Engineering Society, Ambassador Hotel, Los An-geles, Calif.

IRE International Convention, Coliseum and Waldorf-Astoria Hotel, New York, N. Y.

11th biennial Electrical Industry Show and Conference.Elecrical Maintenance Engineers Association of Calif.Shrine Exposition Hall, Los Angeles, Calif.

Annual Convention, National Association of Broadcasters,Conrad Hilton Hotel, Chicago, Ill.

S. W. IRE Conference and Electronics Show, (SWIRECO)Rice Hotel, Houston, Texas

91st Convention, the Society of Motion Picture andTelevision Engineers, Ambassador Hotel, Los Angeles,Calif.

1962 Electronic Parts Distributors Show, Conrad HiltonHotel, Chicago, Ill.

that other manufacturing companies, making compac-trons, will continue to join G -E in using this term as acommon generic term to designate these multi -functiondevices.

HARASSING NOISE in his home, complained Schen-ectady suburbanite Eugene Binkowski, in a letter toPresident Kennedy. Investigating technicians, from theGriffiss Air Force Base, told Mrs. Binkowski that herfamily's hearing is so acute it picks up high-pitchedsounds others do not hear. A hearing test given a six -year old son shows that he hears sounds in the 20,000-21,000 cps range, twice the normal hearing range forhigh-pitched sounds. Mrs. Binkowski said one of thetechnicians told her the house is in the midst of a hot-bed of electro-magnetic radiation. Transmission towersof three radio stations are within sight of the house.

EMOTIONAL OUTLET FOR SMALL FRY . . .

Shooting darts at moving characters on the TV screen!Patented recently, a dart game for children consists ofa transparent target, which fastens over the face of aTV set, and darts with rubber suction cups. Its purposeis to provide a means for children to discharge psychicenergy stimulated to highly emotional levels by TVprograms.

MARCH 1962 16

Now with New FeaturesFor Added Versatility

.3

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RCA WO -91A 5 -INCHOSCILLOSCOPENew 2 -Stage Sync Separator Simpli-fies Checking TV Horizontal andVertical Sweep SynchronizationThis popular RCA 5 -inch scope now at yourdistributor's includes a new feature to sim-plify TV servicing: a built-in two -stage syncseparator. This circuit, connected in the pre-set TV "H" and "V" positions, provides ex-ceptionally solid lock -in action on compositeTV signals.

Other "PLUS" Features: 5 -inch screen with high resolution Dual bandwidth (4.5 Mc with 0.053 volt rms/

in. sensitivity; 1.5 Mc with 0.018 volt rms/in. sensitivity)

Internal calibrating voltage and calibratedgraph screen

Includes special direct/low capacitanceshielded probe and cable

$249"*factory -wired and calibrated

SEE THEM BOTH AT YOUR AUTHORIZED

RCA TEST EQUIPMENT DISTRIBUTOR.

'User Price (Optional

RCA WV -98CSENIOR VOLTOHMYST®New 0.5 Volt Full -Scale DC Rangefor Testing Transistor CircuitsNow you can check the low voltages used intransistor circuits even more accurately withthe latest model of the famous RCA SeniorVoitOhmyst.

The new "C" version of this time -testedinstrument includes a high -sensitivity rangethat provides full-scale deflection at onlyone-half volt DC!

Other "PLUS" Feature= Easy -to -read 6I/2" meter face 200-na meter movement with less than 1%

tracking error Precision multiplier resistors accurate to

1% Meter electronically protected against

burnout Separate color -coded peak -to -peak and rms

voltage scales Die-cast aluminum case with leather carry-

ing handle

MEASJRES:DC volts, 0.02 to 1500 voltsAC volts, 0.1 to 1500 volts rms or 0.2 to 4200

volts peak -to -peakRes staice, 0.2 ohm to 1000 megohms

$795°.factory -wired and calibrated

RCA ELEC1RCN TUBE DIVISION, HARRISON,

The Most Trusted Name in Electronics

N J

LETTERSTO THE EDITOR

Continued from page 12

quire 300 to 1000 microvolts from agood outside antenna and still get abad picture, with inadequate sound.

One of the primary failures of setswere the older 21-26 me i-f, whereadaption to UHF reception was doneby strips. These strips contained an os-cillator section often obtaining the IFby beating the incoming UHF signalagainst the third, fourth, or even fifthharmonic of the oscillator. These almostnever gave a proper picture without thebest of antennas. These sets were moreoften better treated with a converteron an unused VHF channel.

I have measured some "directional"UHF antennas, to find that the ratiobetween signal strength with the an-tenna in the advantageous position, ver-sus the signal strength with the an-tenna rotated to the least advantageousposition was something like 300 micro-volts to 298 microvolts, hardly a di-rectional beam at all. One of the prob-lems concerning UHF antennas was theflagrant use of aluminum, which is oneof the worst materials manufactured forantennas in the world. The velocity ofradio waves (in the UHF region) in alu-minum is very poor compared with cop-per.

wish that theFCC has good luck with this venture,but I differ with you since I believethe real reason for failure of this me-dium lies with industry.

CHARLES R. MADUELL, JR.

Delta ElectronicsNew Orleans, La.

Rewiring Multiplex AdaptorsEditor, ELECTRONIC TECHNICIAN

We are writing a few lines com-mending you for the splendid job be-ing done by you and your staff in ex-plaining the new multiplex system forkeeping us posted on all new develop-ments in the TV field. We have hadseveral calls from owners on multiplexadaptors which were bought before FCCadopted the Zenith -GE method-as youknow these adaptors were made forthe Crosby system. We would like toknow, is there a way to convert thesewithout too much expense, and is itlegal?

FRANK CERRONE

State -Television -ServiceValley Stream, N. Y.

It's perfectly legal to redesign re-ceiving equipment. However, it wouldbe a tricky, time consuming job to re-wire your adapter. It may be lesstrouble in the long run to interest thecustomer in a new unit. - Ed.

l6 ELECTRONIC TECHNICIAN

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Join the crowd. When you need a wire -woundcontrol replacement, insist on Clarostat in thegreen box-your assurance that you're gettingthe control that works best.

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Series 39 2 -watt "Humdinger" for screwdriveradjustment.

DISTRIBUTOR SALES DIVISION

R CD BTATCLAROSTAT

MARCH 1962

MFG. CO., INC. DOVER, NEW HAMPSHIRE- - - for more details, circle 19 on page 50

17

TV MANUFACTURERS TECHNICAL DIGEST

GENERAL ELECTRICTV Chassis MW-Correcting UHF Tuning Problem

If fine tuning of the UHF on "MW" receiversbecomes difficult, the problem may be caused by thedial cord slipping on the fine tuning plate. The direct

UHF tuning problems in General Electric ."MW" TV chassis causedby dial cord slipping on fine tuning plate, can be cured by revisions.

drive operation will perform normally, but the finevernier tuning is affected.

This condition can be cured by restringing theassembly to provide more tension on the fine tuningplate. This revision also requires the addition of a ten-sion spring to the UHF pulley, identical to the onealready used, and employment of a slightly longer dialcord.

Note the position of the two springs on the UHFpulley, one for start and the other for finish, placingtension at each end of the dial string. Note that thesprings are placed in separate holes in the pulley. Cor-rect looping of the dial string around the ears on thefine tuning plate is important. This provides the neces-sary drag -increase on the fine tuning plate. Both the19 in. models and the 23 in. set require the samelength of dial cording. However, placement of the open-ing in the pulley in the start position differs.

MAGNAVOXTV Chassis 38 Series-Production Changes

The following changes have been made in produc-tion to improve Magnalux circuit operation:

1. The 180K resistor (R529) in series with thebrightness control has been changed to 150K, 5% tol-erance.

2. The 47K resistor (R528) connected across theseries combination of the LDR and the 3.3K resistorhas been changed to 33K, 2W.

3. The 150K, 10% resistor (R530) in the CRTcathode has been changed to 150K, 5% tolerance.

4. Note that the schematic diagrams on pages 5and 6 of Manual 7248 are incorrectly identified inthe heading. Should read "38" instead of "36."

5. R526 is incorrectly shown on the schematicas 3.3, instead of 3.3K.

MOTOROLATV Chassis TS 581 Series-Removing Coil Shields

The shielded coils in this series are locked in posi-tion inside the shield. To gain access to the coil andcomponents located within the shield, the shield mustbe separated from the coil form as illustrated. If coilform and shield do not separate easily, more pressuremust be exerted at the sides of the shield in order torelease the tabs of the coil form. Reshape shield beforereplacing coil. Be sure coil form locks into position

COIL INSECURED

POSITION

SQUEEZE CAN AT

THESE POINTS &

7_ AT SAME TIME

- PUSH FORM DOWN

AT C) TO RELEASE

COIL

OSQUEEZE PRONGS

TOGETHER TO RELEASE

CANBOTTOM VIEW

Coil shields in Motorola TS 551 series chassis can be removed forcoil component replacement by following the steps outlined here.

inside the shield and that the shield prongs lock intothe chassis. Coils which are dipped in wax must bereplaced as an assembly to maintain proper moistureprotection in high humidity areas.

PACKARD BELLTV Combination Chassis Model 23DK2 - Separate

Radio Operation 8 Production Changes

The radio section of this combination can be op -

I8 ELECTRONIC TECHNICIAN

This Service -Dealer is making a $940 profit

in 7 minutesinstalling a

The Place: Any radio -TV service shop

EXACT REPLACEMENTTV ANTENNA for aPORTABLE TV

The Time: Any working hour

The Product: Two JFD Exact Replacement No. TA386Antennas-one of 74 different O.E.M. portable TV setantennas now in stock at your JFD distributor.

The Facts: portable TV with two broken TA386antennas that need replacement:

Actual Selling Price (2 @ $4.25 ea.) $8.50Dealer Cost (40% off) (2 @ $2.55 ea . ) 5.10Profit on Sale 3.40Charge for Installation 6.00

Total Profit $9.40

Result: The service -dealer makes and keeps a hand-some profit-the customer gets the antenna that isthe precise electrical and mechanical mate for hisportable TV.

No wonder more service -dealers are earningmore money by selling and installing JFD ExactReplacements!Remember, next to receiving tubes, portable and

tote -able set antennas require the most frequent re-placement. Makes sense, doesn't it, to call your dis-tributor for your JFD Exact Replacement Profit Plan.

FREE SALES AIDS!Merchandisers, displays,kits, reference guides,streamers, direct mail,listings in SamsPhotofact folders helpyou sell, sell, sell!

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JFD ELECTRONICS CORPORATION6101 Sixteenth A Brooklyn 4, N. Y.

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MARCH 1962


19

PRODUCTNEWS from EPL

...nothing cheapbut the price!

Compare performance, filtering, quality, output

New DC Power SuppliesGuaranteed 1 Year

They'll sell you on sight. Neverbefore has so much value and per-formance been packed into a com-pletely assembled power supply.Auto radio...Use EC -2 for all servicing needs. UseEC -1 for "warm-up" and "check-out" or as low costpower source for FM and AM demonstrations.

$2995

-4P** C)

Save benchspace. Only107/4" x 43/4"61/2" ... usevertically orhorizontally.

Transistor portable servicing ... Ideal as a hum -freeDC voltage source.

Research and development work ... Reliable perform-ance for wide application in industry and laboratory.

DC VOLTAGE OUTPUT

AMPERAGE OUTPUT

RIPPLE

REGULATION

METER

DC IMPEDANCE

PANEL FEATURES

EC -20.16 VDC continuouslyadjustable0-5 ADC

0.5% at 5A1.8 V/A

0.20 V/O - 10A1.8 ohmsOn -off switch, pilotlight, meter functionswitch, variable volt-age control, insulatedbinding posts, fuse,6' cord.

EC -112 VDC (adjustable)

0.5 ADC

0.5% at 5A1.4 V/A

1.4 ohms

4 -position voltage ad-justment switch, pilotlight, wing nut outputterminals. 6' cord.

Writ* for Complete Line Catalog PS -561

Elatcy

Since

Available Now atYour ElectronicDistributor.

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1936 . . . Pioneers in Low Voltage DC Power Supplies- - - for more details, circle 22 on page 50

TV MANUFACTURERS

TECHNICAL DIGEST

erated without the TV section by inserting the a -ccord from the DPA-30 amplifier into an a -c outlet.Operation may be desired while the TV chassis is outfor repair. This connection will bypass the a -c switchon the tuner panel, and the radio section power willbe on as soon as the cord is plugged in. The plug isremoved from the wall outlet to turn the set off.

The TV can be operated without the tuner chassis.Pins 2 and 3 (ccw, top view) of the 7 -pin socket mustbe shorted together. This can be done with a 7 -pinadapter plug. The socket is located at the top rightcorner of the chassis. Be sure the remote control cableis plugged in (two plugs) before connecting the a -ccord to the wall a -c outlet.

In some sets the two resistors, R-430 and R-431,across the loudness and balance controls, are 180Kohms instead of 150K. Change to 150K if excessiverumble is encountered.

If additional sensitivity is needed for AM receptionthe detector diode 1N295A should be replaced witha 1N541 diode (PB-72089). This change will be madein tuners stamped 3325 or higher. Capacitors C-204and C-205 in tuner 8TU4 were changed from 68 pfto 150 pf (23942) to decrease tendency to oscillate.Changes will be made in chassis stamped 3353 orhigher.

Two resistors, R-401.1 and R-401.2, were addedin the Gorier f -m tuner as a production modificationto prevent drift. R-401.1 is 500K ohms, 3/4 watt, witha negative temperature coefficient, part number 73785(special), while R-401.2 is a standard 4700 ohms,1/2 watt resistor.

PHILCO

TV Chassis 12N50 Series-Production changes

1. Run 2. Transformer T5 was changed frompart No. 32-4745-2 to part No. 32-4745-4, to improvesound sensitivity.

2. Run 3. Capacitor C38 was changed from .02i.tf to .01 pi, part No. 30-1262-53, to reduce drive lines.

3. Run 4. Resistor R57A was changed from 4.7megohm to 5.6 megohm, part No. 66-5568340, toimprove interference rejection. Resistor R-19 waschanged from 470 ohms to 560 ohms, part No.66-1564350, to center vertical linearity control.

4. Run 5. A four inch piece of vinyl tape wasadded to the 1G3 high voltage rectifier tube cap toprevent corona.

WESTINGHOUSE

TV Models With "Mobile-Sound"-Circuit Operation

A system employing an amplitude modulated r -ftransistor oscillator rebroadcasts TV sound so that itcan be received on any a -m radio, while the TVspeaker remains silent. Sound level can be adjusted bythe radio's volume control. The oscillator is attached


Another outstandingdevelopment by themakers of BUSS Fuses

BUSS In -the -Lineor Panel Mounted Fuse&Holder Combination

HLR Holder for GLR and GMF Fuse

For the Protection of Fluorescent Fixturesor Other Equipment ... 300 Volts or less

These BUSS Fuse & Holder combinations make itespecially simple to protect fluorescent fixtures. They arealso being used in a wide variety of other applicationsto protect any device or equipment on circuits of 300volts or less.

BUSS GLR fast -acting type fuses or BUSS GMFslow -blowing type fuses are used in combination withBUSS HLR fuseholders. Fuseholder can be installed in -the -line or panel mounted.

Fuse and knob of fuseholder are in one piece. Whena fuse blows, the entire fuse knob assembly is replaced.Cap of holder is insulated to protect user against possi-bility of shock.

Why safety demands that fluorescent fixtures be protected.

Trouble in fluorescent fixtures generally starts whenthe insulation in the ballast breaks down. This causesa short which develops heat, and can result in:

Molten compound dripping on people, equipment andmerchandise ... Gases forming and exploding, injuringpersonnel or damaging stock and equipment ... Firesstarting in ceiling or walls near fixture ... Short continu-ing until branch circuit fuse blows and cuts off all lightson circuit.

All these dangers can be minimized by proper BUSSGLR or GMF fuse protection.

To get the full story write for BUSS bulletin SFH-6.

BUSS-The complete line of fuses& mountings of unquestioned high quality

BUSSMANN MFG. DIVISIONMcGraw -Edison Co.ST. LOUIS 7, MO.

ELECTRONIC TECHNICIAN


21

ADD A NEW SIGN TO YOUR DOOR TV MANUFACTURERS

TECHNICAL DIGEST

5

RADIO REPAIR 17, ry

- etTV SERVICING

MOBILECOMMUNICATIONS

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1962 starts a new era in mobile communications when you getyour FCC License. Under the skilled direction of RCA Institutesexperts, you can obtain at home the technical qualifications foremployment in the Communications Industry. In addition to pre-paring you for an FCC license, you are supplied with the trainingneeded to service and maintain 2 -way radio communications fortruck and taxi fleets, police, fire, bus, railroad and other publicservice vehicles. You also get the technical foundation for ad-vancement in space and aviation communication electronics. Thisis not a cram course ... not a rehash of old radio lessons. Learnfrom RCA what it takes to get ahead in the ever-expanding fieldof communications.With RCA Institutes home training in Communications Electron-ics, you set the pace that suits your ability, finances and time.RCA's liberal Voluntary Tuition Plan is the most economical homestudy method, because you pay for lessons only if you order them...one study group at a time! If you drop out at any time, for anyreason, you do not owe RCA one penny! No other obligations!Licensed by New York State Education Department. Approvedfor Veterans.

Prepares You for an FCC License

RCA INSTITUTES, INC.Other home studycourses available:Electronics FundamentalsBlack & White and Color TVAutomation ElectronicsComputer ProgrammingTransistors

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RCA INSTITUTES, INC. Home Study School, Dept. ET -32350 West Fourth Street, N. Y. 14, N. Y.Without obligation. rush me the FREE 64 page illustrated booklet "Tow Career In Electronics" dincrlb-ing your electronic home study training program No salesman will Call.

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to the inside cabinet base. A plastic shaft, projectingthrough the TV's rear cover, is attached to a tuningcapacitor (C-6) which is adjusted by the customer sothat the TV sound is received at a remote point onone or more a -m radio sets. The TV sound is tunedin at a spot on the radio dial where no station is trans-mitting.

The oscillator circuit consists of TR-1A; the pri-mary of LI, C6, L3 and transmitting antenna L2;feedback capacitor C5; and C2-for r -f ground. Itoperates as follows: TR-1A is cut off during most ofeach cycle by the reverse bias that exists between itsbase and emitter. However, when the positive feed-back, coupled to the emitter through C5, becomes suf-

Circuit of Westinghouse transistorized "Mobile -Sound" transmitter isamplitude modulated by a TV set's audio signal. Unit "transmits" theTV set's sound to any nearby a -m broadcast receiver.

ficiently positive, the instantaneous emitter voltagewill rise above the base voltage. TR-1A is now forwardbiased for an instant. The transistor operates Class C-beyond cut off-but is driven into conduction duringeach cycle.

A +20 volt source, tapped from the TV set'saudio output tube cathode is supplied to TR-1A througha stepping relay. This voltage is divided by R2 andRI to provide the proper base voltage, and by R3,R4 and TR-1A to provide emitter voltage. The col-lector is at zero volts since there is no appreciabled -c drop across the primary of LI.

The audio signal is supplied to TR-1A throughpoints on the stepping relay. It is then coupled throughCl and placed across the transistor's base and emitter.This audio signal varies the base to emitter bias, caus-ing collector current to vary at an audio rate.

The collector current flowing in the primary ofL1 causes a similar current to flow through its sec-ondary and also L2, the transmitting antenna. Thusa modulated r -f carrier is transmitted.

L3 is used to suppress harmonics which couldcause tweet interference; C4 drops the bass level slight-ly to compensate for a small loss of treble throughC2; C3 equalizes the amount of oscillator output overthe tuning range of C6.

The "transmitter" has been built to comply withFCC regulations and should not be modified.


Tarzian offersONLY

FAST, DEPENDABLE

TUNER

REPAIR SERVICE

V.7.101.1

1

1

ALLMAKES

It just makes sense that a manufacturer of tuners shouldbe better -qualified, better -equipped to offer the most de-pendable tuner repair and overhaul service.

Sarkes Tarzian, Inc., pioneer in the tuner business,maintains a complete, well-equipped Factory Service Dept.-assisted by Engineering personnel-and staffed by spe-cialized technicians who handle ONLY tuner repairs . . .

on ALL makes and models.Tarzian-made tuners received one day will be fixed and

shipped out the next. Cost is only $8.50 and $15 for UVcombinations. That includes ALL parts (except tubeswhich are furnished at our cost) and labor, and a 6 -monthguarantee against defective workmanship and parts failuredue to normal usage. Replacements available at low coston tuners beyond practical repair.

Tarzian-made tuners are identified by this stamping.When inquiring about service on other tuners, alwaysgive tube complement . . . shaft length . . . filament . . .voltage . . . series or shunt heater . . . IF frequency . . .

chassis identification. All tuners repaired on approved,open accounts. Check with your local distributor forSarkes Tarzian replacement tuners, replacement parts, orrepair service.

SERVICE MANAGER TUNER DIVISION DEPT. 3A

\-TISARKES TARZIAN INCeast hillside drive bloomington, indiana

edison 2-7251

MANUFACTURERS OF TUNERS SEMICONDUCTORS ... AIRTRIMMERS ... FM RADIOS ... AMFM RADIOS ... AU010TAPE . . . BROADCAST EQUIPMENT and SHISH -KABOB GRILLES

INCLUDING

PARTS111

Fand LABOR

24 -HOUR SERVICE

6 -MONTH WARRANTY

Tuners Repaired on

Approved, Open Accoun

See your distributor, oruse this address for fast,

factory repair service

MARCH 1962


23

easiest way to service a TV!CDIN. alr 4:feateX mad.ed 04reieenee

Put it in the mail, and we'll take it from there. Not the whole SONY 8-301WTV, of course. That wouldn't be very economical, despite its truly portableweight of only 131/4 lbs. No, lust the printed circuit board, one of the threeon which all 23 transistors and nearly every other component is mountedto make service an absolute cinch. No need to worry about stocking partswith SONY TV. Just isolate the faulty component, snap out the board andship it off to us. In amazingly little time you'll have it back, good as new,and at surprisingly reasonable cost. Just another reason the SONY 8-301WTV, $249.95 list, is a pleasure to sell-and service. Battery Pack Optional.

SONY CORP. OF AMERICA514 Broadway, New York 12, N. Y.

SONY CORPORATION OF AMERICA 514 Broadway, New York 12, N. Y.Gentlemen: I am interested in the SONY portable television. Please rush

full details.

STORE NAMERegional Of

NAME TITLECentral: 4959 W. Belmont Ave., Chicago 41, Ill.ADDRESS

Western 627 South Towne Ave., Los Angeles 21, Calif.CITY ZONE STATE

- - - for more details, circle 50 on page 5024 MARCH 1962

ET VIEWPOINT

A Bold Approach to Industry Problems

The electronic service industry suffers from manyan ache and pain. Some are the fault of service dealers,while others are caused by manufacturers and dis-tributors who take advantage of the dealer's inabilityor unwillingness to act forcibly.

Two elements operate in the area where the servicetechnician has no one to blame but himself. First, ithas always been deplorable that the great majority oftechnicians do not recognize the importance of beingactive in their local service associations. This deprivesthe technician of a unified voice capable of correct-ing industry ills. It's a cumulative effect at that, sincethe weaker association offers still less appeal to theunaffiliated technicians who are sitting on the fence.

The second point which operates against servicedealers is their frequent reluctance to operate undersound business practices. If you made a financial an-alysis, you would see that there's an insufficient profitreturn on house calls that charge $3.00. Furthermore,all businesses borrow money to expand and merchan-dise additional profitable products. Too many servicedealers are hesitant to do so. Look at other businessesin your community. Locksmiths sell affiliated hardwareproducts; watchmakers sell such gift items as radiosand pens. The service dealer should at least be thecommunity supply source for consumers who want tobuy antennas, transistor portables, hi-fi components,and various hobby devices over the counter.

There is also the need to meet competition on itsown ground. When self-service tube testers became pop-ular a few years ago, some service dealers bemoanedthe fact-and lost the business. More enterprising deal-ers set up their own tube tester routes, and so re-couped the tube sales lost.

Now let's look at some of the people who takeadvantage of the service dealer's all too frequent in-ferior position. High up on the list must be the so-called distributor who buys from a manufacturer andsells retail to the public, by-passing the dealer who isoften his major customer. In those communities where

the dealers stood up on their hind legs and told thedistributors that they must be either retail or whole-sale constructive results have been obtained. However,in other communities, technicians take the "why fightCity Hall" attitude, and the unhappy status quo re-mains. If a distributor is willing to serve your interests,travel the extra distance or pay the extra few penniesto patronize him. In the long run, it will cost a lotmore in terms of business loss when you support thedistributor who doesn't think, much less care, aboutyour welfare.

Manufacturers are far from blameless. Just as thetechnician catches the consumer's ire for improperlymade products, and the distributor may receive thewrath of a technician, many a manufacturer is alsodeserving of a figurative horsewhipping. Not only dothey cater to distributors who care not a fig for theservice dealer, but they even turn around and pushtheir products as hard as possible in channels entirelyoutside the electronic industry. When electronic prod-ucts are sold through drugstores, supermarkets anddepartment stores, particularly TV system parts andcomponents, only the uncaring manufacturer benefits.The distributor and dealer both lose their normalbusiness. Even the consumer often ends up spendingmore than he should for an improperly selected product.

We hope that readers who recognize these dis-tasteful situations in their own community will writedirectly to the manufacturer. The addresses of allmanufacurers are listed in our annual Directory pub-lished each May.

Lest these statements be misinterpreted, we wishto make clear our recognition of those distributors andmanufacturers who do work for the welfare of the serv-ice dealer. Also, a number of enterprising service deal-ers can be held up as prime examples of what theindustry should be doing. We have, however, em-phasized the undesirable aspects because these are theones that need attention and correction if the elec-tronic service industry is to thrive.

Reminder for the Big Show

The 1962 Institute of Radio Engineers Interna-tional Convention will be held in New York City'sColiseum, March 26-29.

Though the great emphasis is on military and in-dustrial products, we are sure that our readers willfind many informative and interesting displays.

Those technicians who are looking forward to apossible career in industrial electronics will obtain abit of insight at this show. In this regard, you may be

interested to hear what the general maintenance fore-man of a large guided missile company had to sayabout background requirements for electronic main-tenance personnel: "Radio or TV repair experience isfar more vital than any other electrical repair experi-ence."

Furthermore, to increase one's professional knowl-edge and status, technicians should also consider ap-plying for IRE membership.

MARCH 1962 25

Fig. 1 - Victoreen's Model489 Thyac II transistorizedmeter detects alpha, betaand gamma radiation.

How Geiger andscintillation detector circuits operate

Ateleue .4tel

Radiation detectors are used formonitoring radiation leakage fromX-ray machines, observing radio-active materials used in industry,and for radioactive ore prospecting.These detectors take many differentforms. A typical portable unit withsearching probe attached is shownin Fig. 1. The probe contains thedetector and all of the circuitry isin the case. Some units have the de-tector built into the case itself.

Electrically, these are not com-plex units as may be seen fromthe schematic shown in Fig. 2. Ra-diation energy causes conduction inthe ion chamber and a current flowI. This appears across R as anIR drop which is amplified by thetwo tubes. Output is read on Min the plate circuit of tube No. 2.Note the feedback and balance ofE-2 is equal to V-2 so there is nometer reading for zero radiation.

Some radiation detector units areequipped with a flashing neon lamp

Electronic Devices

Detect Radiation

as well as earphones, or speaker(See Figs. 3 and 4) which provideboth visible and audible signals in-dicating the presence of radiation.The heart of these devices is theradiation detector, usually a GeigerMueller tube, for picking up thedifferent forms of radiation. Someunits employ photomultipliers inscintillation detectors.

Geiger Mueller Tube

The Geiger Mueller (G -M) tubeis generally employed in low-costGeiger counters for radiation de-tection. The Geiger tube consists ofa thin wire of tungsten passingthrough an inner cylinder of thinmetal or coated glass. This assemblyis placed inside an outer cylinderwhich is filled with a gas. In ef-fect, the tube is somewhat similarto a gas -filled voltage regulatortube.

A voltage is applied to the G -Mtube, with the center wire positive,

and the inner cylinder negative.As a particle of radiation enters thetube through a window in the cyl-inder, the particle collides with agas atom inside the tube and theatom loses an electron. The atomthen becomes a positive ion. Thefreed electron is attracted to thepositive wire but, in its travel, itcollides with another gas atom andproduces another free electron, etc.Thus, for each single particle ofradiation many free electrons areproduced. These are all attractedto the positive wire which actssimilarly to a plate in an amplifiertube. The total number of free elec-trons arriving at the wire becomesthe output current. The positiveions are attracted to the cylinderwhich has a negative potential.Here they are neutralized by pick-ing up electrons to make them neu-tral gas atoms again.

Thus, when a single particle ofradiation reaches the G -M tube, a


rapid multiplication of free elec-trons occurs, and in a very shorttime all of the free electrons arriveat the wire and all the gas ionsarrive at the cylinder. The tube hasprovided an output and is nowready for the next particle.

Based upon the detection actionof the G -M tube many simple,portable Geiger counters can bebuilt. The design depends upon thenature of the particular tube andthe final desired cost. Models areavailable from the most simple toquite complex units with completeamplifiers and several types of de-tectors.

Forms of Radiation

Radioactive elements, such asradium and uranium, throw offparticles and rays in the process ofnatural disintegration. These parti-cles and very high frequency wavesare used as a means of detectingthe presence of radioactive mate-rials. This radiation has essentiallythree types of energy: alpha andbeta particles, and gamma rays.

Alpha particles have high ener-gies but they travel only a few inches-being stopped by a few centi-meters of air. They can also bestopped by thin aluminum foil ora sheet of paper. These particles areequivalent to helium nuclei, or he-lium atoms which have beenstripped of their orbital electrons.They are made up of two neutronsand two protons and carry a posi-tive charge.

Beta particles are high-energyelectrons with greater force thanalpha particles and they travel fargreater distances before they arestopped by collision with other ma-terials. At average speed, a one -eighth inch thickness of aluminumis required to stop them. Of course,they carry a negative charge.

Gamma rays are extremely shortwave -length electromagnetic radia-tions, or photons. They are a typeof X-ray radiation which are verypowerful and move easily throughmost materials. Depending upontheir speed, they can pass throughseveral inches of lead.

Other Detector Types

Radiation from radioactive ma-terials can be converted into visible

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Fig. 5-Phosphor crystal converts radiation to ligFt. ligl-t sensitive photo-cathoce converts lightinto electrons which are progressively increased ay the photo -multiplier tube anodes.

MARCH 1962 27

light by using the flourescent ef-fect of certain substances. Amongthese substances are zinc sulphideand calcium tungstate. When a ra-diation particle strikes a transpar-ent crystal phosphor made of oreof these materials a flash of lightor a scintillation is produced. Whilethese scintillations themselves maybe used as indications, they areusually too faint, and must be am-plified.

Scintillation detectors may beused to record alpha, beta, or gam-ma radiations depending on thetype of materials used. These count-ers are more sensitive than Geigercounters and they can also detectparticles which are close together.It is possible by the use of countersto record in an accurate manner

Fig. 6-Simple radiation detectorformer to boost voltage.

Fig. 4 - Diagram ofamplifier, rang* andindicating section ofHeath Model RC -1

portable radiationcounter.

a large number of pulses in a veryshort time. In this way the scin-tillation detector is sensitive to boththe rate (frequency per unit oftime) and the strength of the ra-diation. However, because the phos-phor screen converts the radiationinto visible light, an ordinary vac-uum tube amplifier cannot be used.A different type of amplifier is re-quired.

When radiation falls on thetransparent crystal phosphor it cre-ates scintillations of visible light.And this small signal must be con-verted into an electrical signal andthen amplified.

Any photo -cell sensitive to visi-ble light can be used to convertlight to a flow of current. Lightfalling on the cathode causes the

power supply employs a transistor oscillator and a trans -

emission of electrons. The photo-cathode is transparent just as withtelevision camera tubes. The light,created by the radiation reaching thecrystal phosphor, falls upon thetransparent photo -sensitive cathode.Electrons are emitted by the photo-cathode where this weak signal isamplified by electron multiplica-tion. As shown in Fig. 5, a seriesof small anodes (plates) are con-nected so that each has a higherelectrical potential.

Typical Circuit Functions

G -M tubes require a powersource in the range of 1000 voltsor more but with currents of onlymicroamperes. Because of these re-quirements d -c to a -c convertersare used to take the low -voltageand step it up. First the d -c isused to power an oscillator. Nextthe oscillator's output goes througha step-up transformer. The result-ing high -voltage is rectified and fil-tered. Any frequency from audioto r -f can be used and less capacityis required to filter the higher fre-quencies.

Various oscillators, includingblocking -tubes and multi -vibrators,are used to generate the requireda -c. A simple tapped transformer,as shown in Fig. 6, can be usedfor a high -voltage supply. An audiooscillator using a transistor, for ex-ample, a 2N255, is connected to

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a transformer such as that used forfilament voltage. When the switchis closed the transistor oscillates, inthe audio range, because of the in-ductive feedback. R-1 limits thebase current and also determinesthe amount of power output. Trans-former T provides about a 20 to 1

stepup of voltage. Usually about1000 volts can be obtained withthis circuit which, because of theR -C filter and rectifier drop, pro-vides an output in the 900 voltrange at 1 mill or less. This is allthat is required for most G -M tubes.

The rectifier diode and filter ca-pacitors must have at least a 1000volt rating, or more for a safetyfactor but several components canbe used in series to cut down thepeak voltage rating required. Forexample, two capacitors, each .05pf at 500 volts will provide .025pf at 1000 volts when used inseries. Voltage multipliers are alsoused to provide the required high

voltage. In addition, automatic con-trol circuits are employed to makethe output voltage substantially in-dependent of normal load variationson the secondary as well as thenormal range of battery voltage.

A typical radiation detector sche-matic is shown in Fig. 7. The vari-ous radiation detector probes arepowered by the same high voltagesupply with a regulated output volt-age of either 900 volts or 1200volts. The 900 volt output is re-quired for the Geiger tube detec-tors and is labeled GM on the in-ternal selector switch, S-2. The1200 volt output is selected forthe scintillation probes and is la-beled SCINT. This high voltagesupply is a blocking oscillator driv-en "fly -back" type circuit wherethe blocking oscillator portion ofthe circuit is Q-2, R -7B, transform-er T-2 windings 3-4 and 5-6, andbatteries BT=1 and BT=2.

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on, Q-2 conducts and an increas-ing current flows through winding3-4. This current also flows throughthe collector of Q-2 and induces avoltage in winding 5-6 which main-tains conduction of Q-2. The col-lector current increases until Q-2has sufficient current gain to re-main saturated, when the circuitrapidly turns off because of the re-generative action of the transform-er. During the turn-off action, largefly -back voltages appear across alltransformer windings. A voltagepeak of about 1100 or 1400 volts(depending on whether the 900 or1200 volt output is selected) ap-pears across winding 1-2 becauseof the large number of turns inthis winding. This voltage "fly-back" is rectified by diode CR-5in a conventional half -wave recti-fier. R-12 and C-4 form a filter tosmooth the pulsations of voltageacross C-5. A corona dischargetype regulator V-3, regulates theoutput voltage at 1200 voltsthroughout the battery life, whenthe switch S-2 is in its SCINT oropen position. When S-2 is switchedto the GM or closed position, an-other corona regulator V-2, regu-lates the output at 900 volts. WhenV-2 is connected across V-3 by theswitch S-2, the 1200 volt regulatorV-3 does not conduct at all, V-2taking all of the power supply cur-rent and preventing V-3 from fir-ing.

The high voltage, through con-nector J-2 is fed to the radiationdetector across the load resistor R-11. A current pulse from the de-tector caused by an ionizing eventthen appears as a negative voltagepulse at the input connector J-2Witi some exceptions, the pulseshaping circuit is a blocking oscil-lator similar to the power supply.

This circuit is held "cut-off' bythe bias formed by resistors R-9and R-10 and the power supplybattery. The blocking oscillator con-sists of components Q-1, T-1, L-1.CR-1 and C-1. The coupling Ca-pac:tor C-1 couples the negativepulses from the radiation detectorto the base circuit of Q-1. Induc-tance L-1 forms a high impedancefor these pulses while providing alower impedance path for direct


MARCH 1962 29

Whipping TV

Transformer

161Problems

4 Petea Vtia144

Technical Editor

Fig. 1-Picture on TV screen after oneleg of rectifier winding opened on trans-former. Shrinkage and neck shadow wereaccompanied by a substantially darkerpicture.

Technicians are frequently con-fronted with troubles in one ormore of five basic TV -receivertransformer types. These include thea -c power transformer; video i-f;vertical blocking oscillator andsweep output; horizontal sweep out-put, and audio detector and out-put transformers.

Technicians should have a goodknowledge of symptoms which in-dicate defects in each transformertype and be skilled in quickly iso-lating trouble in each area.

Low Voltage TransformersLow voltage power transformers

supply the total "fuel" needed inall TV sets except the series -stringor series -parallel string types. Thesetransformers are generally used infull wave tube, selenium or siliconrectifier circuits, and usually havea 117-120 v, 60 cycle primarywinding, a step-up secondary wind-ing supplying from 250 to about

Fault symptoms point wayto isolation of defective components

380 a -c volts, and one or morestep-down secondary windingswhich supply tube heater voltages.

When the power transformerfails, completely or in part, a num-ber of different symptoms are im-mediately observable in the TV set.For example, the set may be com-pletely dead-no picture, no sound,and no raster. Tube heaters mayor may not be lighted. Then again,there may be sound and no raster.In this case, the damper tube'sheater winding on the power trans-former may be defective. There areother possible symptoms. One sideof the high voltage secondary ofthe transformer may open, the pow-er supply becoming a half -waverectifier, with results as shown inFig. 1.

In most cases, when a regulartransformer powered TV set isturned on and its tubes do notlight, the trouble is usually in theset's power cord, on/off switch,

fuse, interlock connection, or thetransformer's primary winding isopen. Under certain rare circum-stances the tubes may not light be-cause of a poor lead connectionfrom the transformer's heater wind-ing. Also, when a 12.6 volt split -heater transformer is used, one openoutside lead can cause part of thetubes being supplied by this trans-former winding to remain lightedwhile the other group is out.

If the set's a -c fuse, or the housefuse blows, or the lights dim sud-denly when the set is switched on,the trouble can be caused by ashorting power transformer but thisgenerally results from a defectiverectifier, a shorting filter or a heavyexternal load on the power supplycaused by a short somewhere onthe B+ line.

When the a -c input of a trans-former powered set does not havea fuse, the power transformer mayoverheat and become damaged


when a rectifier or filter capacitorshorts, or when some other heavyload is placed on the power supply.When this occurs the transformerfrequently smokes. Experiencedtechnicians recognize this symptomby the peculiar odor given off bythe overheating transformer. Thisodor will usually linger in the setfor hours, even after the set hasbeen turned off. A transformerwhich has overheated and smokesshould be replaced-even thoughsome badly overheated transform-ers have been known to serve foryears without breaking down undernormal load.

Although it is easy to determineif a power transformer winding isopen by using the ohms functionon a VOM, it is not always easyto isolate a shorted transformerwinding by the same method.

Perhaps the easiest and mostdefinite way is with a properlyfused load -check meter (a -c watt-meter). However, if this instrumentis not on hand, a 150 to 200 wattlight bulb equipped with test -typeinsulated socket, plug and flexibleleads with insulated clips, can serveas well.

As shown in Fig. 2, the lamp

is connected in series with the a -cline to the TV set. The lamp notonly acts as a current limiting re-sistor but can be employed to in-dicate if a short exists in a powertransformer section, a rectifier, fil-ter capacitor, or because of a shortat some other point on the B+ line.

If the TV is equipped with ana -c line fuse which blows each timethe set is turned on, and the trans-former is suspected, remove thetransformer's secondary windingconnections, including all heaters,replace the fuse, connect the lampas shown, and switch on the set.If the lamp glows brightly thetransformer is definitely defectiveand should be replaced. If the lamplights dimly or not at all, the trou-ble is probably beyond the trans-former.

However, in the latter case, thesecondary windings of the trans-former should be reconnected oneby one, including the heaters, butwith the rectifier removed from theset at this point. In this manner itcan be determined if an individualcircuit -section of the secondary isdefective or a short exists in heatercircuits.

If the lamp still does not glow

brightly, replace the rectifier. If thelamp now glows brightly, the rec-tifier is either defective, or a filtercapacitor is shorted or a short existssomewhere in another area of theset on the B+ line. Actually, therectifier should be checked in thebeginning whether suspected ornot. The set should be switched off,o: course, before each test step.

Some transformers may develophum or buzz. This is usually knownas lamination hum and can be re-duced or eliminated by tighteningthe transformer's four housingbolts.

Whenever a TV requires a re-placement power transformer it ishighly desirable to obtain an exactphysical fit, even if the transformeris a universal replacement typewith slightly different electricalspecifications or with additionalheater windings. A transformer thatmounts to the chassis precisely asthe original did, will save the tech-nician considerable time in mostcases.

Despite all this, it may be neces-sary on some occasions to drillnew holes, enlarge or reshape amounting hole in the chassis, or fillup a portion of the original hole.

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SWEEPGENERATOR

MARCH 1962 31

Video I -F Transformers

There are a number of i-f coup-ling methods, including the stand-ard slug tuned primary -secondarytransformer. Whatever the config-uration, they are all used to obtaina TV receiver pass -band sufficient-ly wide to pass all composite videofrequencies, without distortion,while they are being progressivelyamplified in the i-f amplifier strip.

The i-f transformers in modernsets are stagger tuned. This means,as we know, each transformer istuned to a different frequency some-where in the 4 mc band extendingfrom the 41.25 mc sound channelto the 45.75 picture channel (21.25to 25.75 mc in some older sets).Loading resistors are frequentlyused across a slug tuned transform-er's winding to aid in broad -band-ing frequency response.

A defective i-f transformer cancause a complete loss of pictureand sound, loss of picture and weaksound, a weak washed out picture(not accompanied by snow); pic-

smearing, flashing, white areas

trailing black areas, lack of defi-nition, poor sync, and other symp-toms.

The windings in some i-f trans-formers occasionally short, burnout or open for other reasons.Many, however, become intermit-tent because of cold or rosin jointsat a point where the fine windingwires join the transformer's lugs.

There are a number of ways toisolate a defective i-f stage. Onemethod is signal tracing. An oscil-loscope, with a demodulator probeattached, is employed as shownin the set-up in Fig. 3. With a TVstation tuned in, the probe is placedat the tuner output, and the scope'sgain is turned to maximum-withits frequency set at 30 cycles. Ifa composite video signal is ob-served on the scope's screen, theprobe is next moved to the first i-ftube plate. The amplitude of thecomposite video signal should in-crease considerably if the tube isamplifying normally. This processis followed alternately from grid toplate of each stage until that stageis located where the signal drops

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Fig. 2-If a load -check meter is notavailable, an ordi-nary lamp can beused to isolate a de-fective power trars-former.

Fig 4-Sweep-circuittester is used tocheck a vertical out-put transformer bysignal substitution.

off or disappears entirely.Another approach substitutes an

r -f sweep signal injected into ani-f grid to replace the regular TVsignal (Fig. 3). In this case, thescope and demodulator probe isused to observe the pass -bands ofindividual i-f stages, or the com-bined pass -bands of subsequentadded stages. A loss of signal, anincrease or decrease of the responsecurve's amplitude, or an incorrectcurve shape, is significant in fin-ally isolating the defective stage.Some technicians begin first by em-ploying a low capacitance probe onthe scope, beginning signal tracingat the video amplifier stage, movingstep by step in the opposite direc-tion toward the first video i-f in-put point. Of course, a demodu-lator probe must be substituted forthe direct probe at the video de-tector input.

After a fault is isolated to a givenstage it can usually be pinpointedby checking the transformer's wind-ings with an ohmmeter, with theset turned off. It is not necessaryto disconnect most transformers tocheck for open windings, exceptwhere resistors are shunted acrosswindings, or in some first i-f gridtransformers, where the primaryand secondary may be connectedtogether. It may also be necessaryto disconnect some transformersused at the last i-f output, depend-ing upon the video detector cir-cuit's design.

Intermittent connections can gen-erally be located by carefully prob-ing solder connections on trans-former lugs with a small plasticrod while observing the picture onthe CRT. If the bad connection istouched, the picture will usually goout momentarily or the CRT screenwill be covered with flashes andstreaks. A low wattage solderingiron and a drop of solder will usual-ly take care of these problems.

When poor solder joints or openconnections are encountered on theinside points of winding connec-tion terminals, some transformerhousings can be opened, their wind-ings carefully removed, and repairsmade with a soldering iron.

When a transformer replacementbecomes necessary, it is again de-



dETOUGH DOG CORNER

Difficult Service Jobs Described by Readers

HV Cage Missing-Sync Unstable

A Teleking TV set, model 174,was taken to the shop with noraster. A shorted capacitor in thehorizontal afc discriminator circuitwas replaced restoring the rasterwith picture. After replacing twoweak tubes and giving the set ageneral cleaning, it looked fine -except for one thing. When switch-ed on from a cold start the hori-zontal frequency was way off.

Both the horizontal hold controland the ringing coil had to be ad-justed to sync the picture, and thepicture could easily be thrown farout of sync again by rapidly turningthe horizontal hold control. Thiswas a marginal condition I felt hadto be corrected.

Tubes were substituted first, ofcourse, but without correcting thetrouble. I then checked all compo-nents in the afc discriminator andhorizontal oscillator circuits. Every-thing checked normal. I even triedexperimenting by substituting com-ponent values in the afc circuit butwithout favorable results. The onlyremaining component left uncheck-ed by direct substitution was theringing coil. Not having a replace-ment I ordered one.

The new ringing coil was clippedinto the circuit with two long testleads and the receiver was put ontest. The results were satisfying.Now the horizontal frequency wasrock stable and behaved the wayit should. To be 100% sure Iswitched back and forth from thenew coil to the old coil a dozentimes or so until there was no doubtthat the old coil was defective.

I removed the old ringing coilfrom its mounting hole on the chas-sis rear apron and installed the newone in its place. I turned the seton and the picture came on out ofsync!

Now I was really puzzled. Severalhours of time were lost and I wasright where I had started. I triedan experiment. I took the coil outof its mounting hole and hookedit up again with the test leads, lay-ing the coil down on the workbench.I turned the set on and this time itcame on as it should. I picked upthe coil and moved it closer to itsmounting position. As I approachedthe rear apron the frequency be-came unstable; as I backed off, itsettled down.

Since the high voltage cage onthis chassis was missing I surmisedthat the coil was picking up pulsesfrom the flyback transformer.

Having no spare high voltagecover, I relocated the coil fartheraway from the flyback. By mount-ing it closer to the front apron ofthe chassis the receiver worked fine.-Frank A. Salerno, Long IslandCity, N. Y.

Static And Varying Sound

1 was recently confronted withan unusual intermittent in the audiosection of an RCA KCS 108C TV.

Symptoms were "static" in thesound, and varying volume. Afterchanging audio tubes in the housewithout clearing up the trouble, Iexplained to the customer that thesymptoms indicated a transformerin the sound section was breakingdown.

With the set on the bench, Ichanged the ratio detector trans-former but the trouble persisted. Ipulled the video amplifier tube andtapped and probed all of the soundcircuits, but no unusual scratchesor noise could be created in thespeaker by these methods. I thenopened the circuit to the grid ofthe 6AU6, 1st sound i-f amplifier,and fed in a 4.5 me signal. Sureenough, at a high input the audiolevel fluctuated and produced static.

I now came to the conclusion thata resistor in the sound section wasarcing internally. A check of R-202,205 and 206 proved negative. Theonly component left was C-209, a5 µf 50 v capacitor. As soon as itwas clipped from the circuit thestatic cleared up. A new capacitorwas installed and the set workedwell without further difficulty -Thomas E. Gregg, Yonkers, N. Y.

Intermittent static and varying sound was caused by defective capacitor C-209.

MARCH 1962 33

TROUBLESHOOTING

Hi-Fi Tone Controls

Tone controls are used in hi-fiunits for a number of reasons. Theycompensate to a great extent forthe normally unequal response ofhuman ears to audible tones; thedifficulties of recording at "flat"levels; reproduction deficiencies inspeakers, room acoustics, and otherreasons.

Technically, a complete tonecontrol system performs five func-tions: The first two functions areboost and cut of low bass frequen-cies with respect to the rest of theaudio band. This action is usuallymeasured as boost and cut at 50cycles with respect to 1000 cycles.

The second two functions areboost and cut of the high treble

Isolate defective tone networks frequencies with respect to themiddle and low frequencies. Meas-urements at 10,000 cycles withrespect to 1000 cycles is the mostfrequently used test. The final andmost important function is lack offrequency discrimination. Someposition must be found in the rota-tion of both controls which neitherattenuates nor accentuates any por-tion of the frequency spectrum. Ifthis function is properly accomplish-ed, the output from the amplifiershould be perfectly flat within 1/2to 1 db from 20 to 20,000 cycles.This, as well as the four afore-mentioned modes, are illustrated inFig. 1 for one type of tone controlnetwork.

with specialized test set-up

naaaie les,toettet1Electronic Instrument Co.

Test Setup

The setup used for testing theresponse of any type of tone control

I

Fig. 1-Graphic illustration shows the five functions of a typical tone control.


is shown in Fig. 2. A monitoredsignal from an audio signal genera-tor is fed to the amplifier's input.The voltage output from the ampli-fier is applied across a second me-ter, while the waveshape is observedon the scope.

For a reliable test, the amplifieroutput must be sinusoidal at alltimes. This requires that the ampli-fier and signal generator level con-trols be properly set to prevent am-plifier overload. No overload shouldexist when bass and treble controlsare at their maximum boost settingwhile being checked at low andhigh frequencies respectively.

Feed a 1000 cycle signal from thegenerator into an unequalized input.Set the amplifier tone, loudness,scratch and rumble controls to getthe maximum flat response (no bassor treble attenuation or boost).Turn the level control on the ampli-fier to maximum. Set the generatoroutput control to the point of maxi-mum undistorted output as observedon the scope. Read the output me-ter db scale at this voltage. Now,turn down the signal generator out-put control until the output meterreads 18 to 22 db below the maxi-mum undistorted reading. Choosea convenient point, for this will beyour output reference level. Notethis reading as well as the readingin volts on the input meter.

To test the bass control, switchthe signal generator to 50 cyclesand adjust its output control so thatthe input meter reads the same volt-age as it did at 1000 cycles. Turn

the bass control to maximum andthen to minimum, observing thereadings in db above and below thereference level you previously notedon the output meter. The peak ex-cursions of the output meter aroundthe reference level is the maximumbass boost and cut the tone controlcan provide. Repeating this proce-dure at 10,000 cycles with the treblecontrol will indicate the boost andcut capabilities of that function.

Troubleshooting any type of tonecontrol circuit is similar to trouble-shooting any other type of electronicnetwork. You must first be certainthat any vacuum tube or transistorinvolved is operating properly. Thevoltages at the various electrodesshould be checked against the man-ufacturer's published data.

"Loeser" Type Controls

This control, still frequently usedin high fidelity equipment, is a hold-over from public address amplifiers.A drawing of this circuit is shownin Fig. 3.

The circuit is essentially that ofa voltage divider. The input is fedacross the complete divider consist-ing of the series combination R-3Rc and Rd R-4. A portion of theinput voltage is developed at theoutput across the series combina-tion Rd R-4. Because only resis-tors are used here, there is no at-tenuation or accentuation of anyspecific frequency range. Capaci-tors added to this resistive dividernetwork modify the response, pro-viding the bass and treble control

action. The size of these capacitorsand the associated resistors in thespecific network determine the por-tion of the audio frequency range tobe affected and by just how much.

The treble control network is lift-ed out of Fig. 3A and is illustratedin Fig. 4A. Resistances Rc and Rdare not shown in 4A because theyare shorted out at high frequenciesby C-3 and C-4 respectively. Theycontribute nothing significant to thetreble control action.

Perhaps this should be explainedbriefly. Consider the treble set atthe maximum attenuation position.Rb is equal to zero while C-2 shuntsR-4 as well as the output. At veryhigh frequencies, C-2 shorts R-4,permitting none of the high fre-quencies (above the audio range)to appear at the output. At mod-erately high frequencies, C-2 shuntsR-4, resulting in an impedancegreater than zero but less than R-4,so that only a small portion oftreble signal will be at the output.At middle and low frequencies, C-2is an open circuit. R-4 is no longershunted and the maximum signalpermitted by the resistive dividernetwork appears across the outputterminals.

This will result in the curvesshown in Fig. 4B, for the conditionwhen Rb=0. If Rb is not equal tozero, the shunting effect of C-2 willdecrease as a function of the sizeof Rb. Depending upon the settingof the treble control, an attenuationcurve intermediate between Rb=0and the flat response will result,

I

SINE WAVESIGNAL

GENERATOR.20 T020 KC

VT V MMONITOR

INPUTSIGN AL

AMPLIFIERUNDERTEST

IR L

OUTPUTMETERVTV M

SHOULD,HAVE CB

SCALE

SCOPE

Fig. 2-Test set-up required for checking tone controls. RL is not used when the output s from a preamplifier.

MARCH 1962 35

In the maximum boost position,Ra=O and C-1 shunts R-3. Be-cause C-1 attenuates the lows morethan the highs, the parallel imped-ance of C-1 R-3 will be less at highfrequencies than at the middle andlow portion of the band. Thus, ahigh frequency signal will developacross R-4, the output, larger thanthe middle and low frequency sig-nals, resulting in the curve shownin Fig. 4B. As Ra is increased, theeffect of C-1 is decreased, provid-ing intermediate degrees of boost.

Trouble Symptoms

Considering treble control opera-tion, troubleshooting this circuit isquite obvious. Little or no treblecut is caused by a defective C-2while little or no treble boost iscaused by a defective C-1. Ofcourse, R-3 and R-4, the control,can be at fault, but are unlikelysuspects. These components caneasily be checked with an ohm-meter.

Bass boost and cut are merely a

C.I

R3

C3Rc

%3 RItxI-

R2

Rb Rd C4

T

R4C2

Fig. 3 - Functionaldiagram of "Lesser"type ton. controlnetwork.

matter of controlled mid and highfrequency cut and boost respec-tively. When properly accomplish-ed, mid and high frequency cut isthe equivalent of bass boost. Midand low frequency boost can beconsidered the equivalent of basscut.

Observing the bass control net-work in Fig. 5A, first consider themaximum boost position when Rcand C-3 are shorted and Rb is atits highest value. The large Rd isshunted by C-4. C-4 bypasses thelarge Rd at middle and high fre-quencies, so that these frequenciesare attenuated. The attenuation iscontrolled by the value of R-4, re-sulting in flat response at the highend. C-4 shunts Rd more at thehigh frequencies than the low fre-quencies, resulting in less attenua-tion for the extremely low bass fre-quencies than for the higher bassfrequencies. The resulting curve isshown in Fig. 5B. As Rc increasesand Rd decreases, the effect of C-4is lessened, resulting in less bassboost.

A

RcINPUT

Rd

B

MAX SASS BOOSTINTERMEDEDIATESETTING or 112

RC 70

R3

±C3

IR2 C4T OUTPUT

R4

INTERMEDIATE 20* --0SETTING OF R2

Rd70

MAX SASS CUT

2KC 20KC

A

B

CI

RIRG

C2

R3

Rb OUTPUTR4

20 200

MAX TREBLE 50057

INTERMEDIATESETTING OF RI

5070

2 INTERMEDIATESETTING Of RI

Rb70MAX TREBLE CUT

Fig. 4 (A)-Treble control network. (B)-Curves resulting from treble Fig. 5 (A)-Bass control network. (B)-Curves resulting from basscontrol action. Note that curve for intermediate setting affects center control action and curve for intermediate control setting affects centerFrequencies. frequencies.

36 ELECTRON IC TECHNICIAN

Bass attenuation is obtainedthrough action of C-3 and Rc. WhenRd=O, the maximum cut position,C-3 shunts Rc, permitting the highsto pass freely to the output throughC-3, while attenuating the lows. R-3limits the treble and mid -frequencyboost, to keep the upper end of thespectrum flat. The boost at the highend and middle frequencies withrespect to the lows, is the equivalentof bass cut. Decreasing Rc providesthe intermediate modes of bass at-tenuation because of the diminish-ing effect of C-3.

Once again, the lack of properaction is generally caused by de-fective capacitors. While a defectiveC-3 will not permit the bass cut tobehave properly, a defective C-4will affect the bass boost. If themiddle and high end does not haveflat response, R-3 and R-4, as wellas C-1 and C-2, are probably atfault. If the low end is not flat whenthe control is set at the center ofrotation, one of these capacitorswill frequently be found defective.

Some controls

a portion of the functions outlinedabove. The principle of operationas well as probable component fail-ures remain unchanged.

Baxendall Feedback TypeNetworks

Feedback type circuits employnetworks similar to those used inthe Losser tone control describedabove. The important factor to re-member is that if you feed back asignal through a capacitor, you arefeeding back more of the high thanthe low frequencies. The resultantsignal will be an emphasis of thelow end with respect to the highs.The size of the capacitor and therest of the resistance network willdetermine if this network will pro-vide treble cut or bass boost.

The most frequently employedfeedback network, designed byBaxendall, is shown in Fig. 6. Thefeedback is from the plate, throughcapacitor C-4 and the resistors R-2,R -4/R-3, and back to the grid.Other feedback paths are possible,such as through C-4, R-2, C-2, C-1,

R-1, half of R-5, C-3, and to thegrid.

Complete analysis of this circuitinvolves a discussion of operationalamplifiers, virtual ground, etc. Al-though very interesting, these de-tails are involved and will not helpin the troubleshooting of this net-work. Table I was designed to helpyou troubleshoot this circuit fromobserved symptoms.

Table I specifies the characteris-tics if there is an extreme defectivecondition, such as an open or short-ed component. If resistanceschanged to larger values or capaci-tors decreased in value, the per-formance of the circuit would ap-proach open circuit conditions. Atendency towards shorted compo-nent symptoms would be evident ifresistance values have decreasedand capacitance changed in the up-ward direction.

The curves produced by this cir-cuit are shown in Fig. 7. Note thatthe curves on intermediate positionsaffect only the extremes of the band


MAX BASS BOOST

INTERMEDIATESETTING OF R4

FOR BOOST

INTERMEDIATESETTING OF R4FOR CUT

MAX BASS CUT

20"., IKC 2KC

MAX TREBLE BOOST

INTERMEDIATESETTING OF RSFOR CUT

20KC INTERMEDIATESETTING OF RSFOR BOOST

MAX TREBLE CUT

Fig. 6-Basic circuit of Bax-endall feedback type toncontrol network.

Fig. 7-Curves resultingfrom settings of Baxendalltone control network. Onlytones at ends of band areaffected.

MARCH 1962 37

New Test Instruments

For BenchAndCaddy

GC Electronics, Resistor -Capaci-tor Selector, Model 36-524 at$24.95-A resistor -capacitor sub-stitution unit is an asset to anyelectronic service shop. It enablestechs to substitute a questionablepart quickly. The unit examinedhere offers individual selection of23 1 -watt resistors (33 ohms to 10megohms) and 22 capacitors(0.0001 id to 300 rated at 600volts and higher values at 450volts).

There's nothing complicatedabout operation of substitutionboxes, of course. For this unit, theuser simply sets a slide switch to"Resistance" or "Capacity" andsets the selector switch to the de-sired value. Integrated test leadswith alligator clips are then con-nected into the circuit. A push but-ton is depressed for capacitor op-eration. Release of the button au-tomatically discharges the capaci-tor for the user's protection. Testleads are marked for polarity, whichis necessary when substituting elec-trolytics.

Besides its obvious use as a quicksubstitution device, the unit can al-so be a great help when trying todetermine the value of an un-marked or charred component.

ET editors examine five test units this month:a battery eliminator -charger for auto radio serv-ice work; resistor -capacitor decade box for com-

ponent substitutions; Citizens Band transmittertester for checking CB units; a combination

transmitter dummy load and attenuator; andTV sweep circuit analyzer for testing horizontaland vertical circuits.

Precision Apparatus, BatteryEliminator and Charger, Model P-28 at $64.95-This is a relativelyinexpensive low -ripple auto radiopower supply that meets all theneeds of an auto service specialist-and then some.

It's designed to meet require-ments of transistorized auto radiosand vacuum tube types with 6 and12 volt ratings. The battery elimi-nator can also operate as a batterycharger for wet cell auto batteries.

The unit has two meters: d -cvolts and d -c amps, both with arange from 0 -to -20. Output voltageis continuously variable from 0-8volts d -c and 0-16 volts d -c. Italso has output terminals for vi-brator -type radios and special out-put terminals for transistor or hy-brid tube -transistor radios.

A variable voltage control andindicating meters are invaluable fea-tures. The output voltage may belowered to determine if a vibratorcommences operation at, say, 51/4volts, and if it doesn't operate atthis voltage, slowly raise output un-til it does operate. A vibrator thatdoesn't operate at approximately51/4 is a questionable component.

Another service aid offered byvariable voltage is locating inter-

mittent troubles by raising voltagebeyond the normal 6 volts toaround 71/2 or so. The higher volt-age often results in a breakdownstate of the intermittent part. Thed -c amperes meter should be ob-served while raising voltage becausean excessive reading could indicatea short in the receiver.

Sencore, Sweep Circuit Analyz-er, Model SS -117 at $89.50-Here's an instrument that enablesTV service technicians to pinpointtelevision receiver sweep troubleswith great speed. It's a signal injec-tion unit, plus a yoke substi-tute, flyback checker, and voltagereading instrument, among others.Essentially, it's the same type as theCompany's predecessor, Model SS -105 (see ET April 1961). However,it has many new, improved fea-tures which make it even more use-ful than the older model.

In addition to providing hori-zontal and vertical pulses whichpermit dynamic tests of TV sets,this new instrument has a separatevertical yoke output signal whichdrives a CRT to full vertical de-flection. Also, greater output isavailable for horizontal and verti-


50 CHM N F INPUTJACKS

10 h 5.55 3K

-6(mo

1

Roar, Selector Switch shown InPosition el. All flee rotors aregaraged.

cal pulses than the older model,resulting in fuller rasters.

The instrument permits users tomonitor cathode current of the hor-izontal output tube through use ofan adaptor socket (also used tocheck screen voltage without testleads). It measures 2nd anode volt-age to 30 kv, too, as well as lowerd -c and a -c p -to -p voltages. A 300pa meter is utilized for minimumcircuit loading. Sync pulses, nega-tive or positive, can be employedto troubleshoot sync circuits.

In truth, this unit has all neededprovisions to allow a user to trou-bleshoot any part of a TV's sweepcircuit without resorting to guess-work. Capping this neat test pack-age, it has a roll chart which in-dicates operating data of horizontaloutput tubes, an all -steel carryingcase with a full mirror in its cover,and two 115 volt a -c outlets in theunit's cable department. Properlyemployed, this unit can no doubtsave the average technician consid-erable time.

ET editor inspecting Seco's transmitter testerwith a Citizens Band unit.

Test instruments shown, left -to -right, are:Saco Model 510 Attenu-load, Precision ModelP.28 Battery Eliminator and Charger, GC

Model 36-524 Component Selector, Seco

Model 510 CB Transmitter Tester, and Sen-core Model S5-117 Sweep Circuit Analyzer.

Schematic of Seco's Model 510 Citizens Bandtransmitter tester.

Seco, Transmitter Tester, Model510 at $46.95, and Attenu-loadModel 511-A at $21.50-Here aretwo pieces of equipment whichtechnicians can use to great advan-tage when installing, testing, andservicing CB transmitters.

Model 510 combines functionsof a number of transmitter test in-struments. The tester measures per-centage of both positive and nega-tive modulation, r -f ma, and poweroutput in watts. It also doubles asa field strength meter or remote in-dicator; the latter requiring the useof a special r -f attenuator cable.The manufacturer also suggests thatthe tester may be used as an a -cvoltmeter or an audio output me-ter.

The "Attenu-load" can be usedas a dummy load bank or as atransmitter power attenuator.

The 510 test unit was designedfor use with low power transmit-ters such as CB equipment, butwhen used with the model 511-A

Attenu-load, the instrument's ca-pacity can be extended to 50 watts.The Attenu-load may also be usedas a dummy load for r -f power to50 watts.

Although Citizens Band trans-mitters are limited to 5 watts inputby FCC regulation, if in doubtabout the maximum power outputof another transmitter to be tested(up to 50 watts), the transmitter isnot connected directly to the tester.Instead, a 50 ohm coaxial cablesupplied with the tester, is con-nected to the transmitter's antennaterminals and then to the Attenu-load input. A switch on the backof the Attenu-load is thrown to the"INT" position before transmitterpower is applied. The transmittertester can then be safely connectedto the Attenu-load output. Powerattenuation is 10 db, which repre-sents a 10:1 power step down ratio.

This equipment should provehelpful to any shop engaged in CBinstallation and repair.

MARCH 1962 39

Recommended practices for the home entertain-

ment electronics industry. Requirements for

avoiding deceptive pricing and bait advertising

TV IndustryAdvertising Guide

An advertising code for thehome entertainment electronics in-dustry has been published by theElectronic Industries Association.Included with this industry -recom-mended plan are reprints of theFTC guides against deceptive pric-ing, bait advertising and deceptiveadvertising of guarantees. The EIAcode text was submitted to the FTCfor review, and recieved approval asan aid to better understanding ofFTC law.

It is the EIA's view that theirlegal position does not allow themto enforce these recommendedpractices. Therefore, in the interestof keeping our readers informed,and in particular those readers whoare also retailers, we are abstract-ing the highlights of the FTC guides,and publishing the EIA code in itsentirety.

By having this informationreadily at hand, readers can beguided in the presentation of theirown advertising, and also have atool for monitoring the advertisingof others in the industry.

EIA Recommended AdvertisingPractices Comparative SalesPrice Advertising

A. When an advertisement, bywords, figures or in any other man-ner states or implies a reduction

from the advertiser's usual price ofthe model advertised, the advertiserhimself should have made actualsales at the higher price in his recent,regular course of business.

B. A statement representing orimplying a reduction or savingsfrom an established retail priceshould be used in advertising onlyif for the specific model advertised,such price has been either (a) theadvertiser's usual price of the samemodel in his recent, regular courseof business; or (b) the pricecharged for the same model by othersellers in the trade area in their re-cent, regular course of business;and (c) the advertisement clearlyshows from which of these twoprices the saving or reduction isclaimed or implied.

C. The terms "sale," "specialsale," "clearance sale," "E.O.M.(end of month) sale," "advancesale," or any other terms which im-ply a price reduction should not beused unless in his recent, regularcourse of business, the advertiser'sprice of the model advertised hasin fact been higher. (If the adver-tiser has not himself offered to sellthe model to which the price re-duction applies, the advertisershould use such terms only if theusual and customary retail price ofother sellers is higher in the trade

area where the claim is made andthe advertisement clearly showsthat the claim is based on such com-parison, i.e., the prices of othersellers. The claim should not bemade if it is based on infrequentor isolated sales by other sellers.)

D. No article should be 'pre -ticketed' with any price figure,either alone or with descriptiveterminology, which exceeds theprice at which the article is usuallyand customarily sold in the tradearea or areas where the 'pre -ticket-ed' article is offered for sale. Thisrule applies to those who dissemi-nate 'pre -ticketed' price figures foruse in connection with the offeringfor sale of articles at retail by others,even though they themselves maynot be engaged in retail sales. Theterm 'pre -ticketed' includes the useof price figures affixed to the articleby tag, label, or otherwise, or inmaterial such as display placards,which are used, or designed to beused, with the article at point ofsale to the consuming public.

Other Price Advertising Practices

A. Whenever a price is adver-tised:

1. The model to which the priceapplies should be identifiedby model number, and also,

2. Any other model illustrated


in the same advertisementshould be identified by modelnumber.

B. The terms "as low as," "from,"etc., should not be used in connec-tion with a price unless a partic-ular model is in fact available atsuch price in reasonable quantitiesand the model is identified in theadvertisement by model number.

C. When prices of display modelsare being advertised, such modelsshould be specifically identified inthe advertisement as display models.Display models include floor sam-ples, demonstrators, and the like.

D. When the price quoted in anadvertisement is "with trade," andthe trade allowance is dependentupon the model or condition of theitem to be traded in, this fact shouldbe stated.

E. Outboarding. When the ad-vertised price does not include de-livery, normal installation, service,or warranty, the advertisementshould clearly and conspicuouslystate that there will be an additionalcharge for an such excluded item.

F. When reference to periodicalpayments is made in an advertise-ment:

1. If a down payment or trade-in may be required, the ad-vertisement should so state.

2. If a terminal or balloon pay-ment may be required, the ad-vertisement should so state.

3. If the periodical payment ap-plies only to certain models,the advertisement should sostate.

G. When the word "free" is usedin advertising the offer should bebona fide factual. If the offer isconditioned in any way, the con-ditions imposed should be clearlyand conspicuously disclosed at theoutset of the advertisement (andnot merely by a footnote) so as toleave no reasonable probabilitythat the terms of the advertisementmight be misunderstood. The word"free" should not be used wherethe advertiser has, in connectionwith the offer, increased the priceof the merchandise required to bepurchased or reduced its quality.

H. If a premium is offered inconnection with the purchase of aninstrument, the statements aboutthe premium should also conform

to these advertising practices.I. No statement should be made

in advertising which implies thatthe advertiser's prices or terms haveany special factory sponsorship orendorsement, unless the statementis true.

Bait Advertising

A. No advertisement containingan offer to sell a product should bepublished unless the model adver-tised is then being displayed by theadvertiser, is available for promptdelivery at the price and upon theterms set forth in the advertisement,and will be willingly sold by theadvertiser.

B. If display models are adver-tised as being available at specifiedprices or at savings, the quantityof such models available should bespecified in the advertisement, orthe advertisement should state thatthe quantity available is limited insupply.

C. If an advertised model willbe sold at all outlets listed in theadvertisement, a sufficient quantityof the advertised product should beavailable to meet reasonably anti-cipated demands, unless the adver-tisement clearly and adequatelydisclosed that the supply is limitedand/or the advertised product isavailable only at designated out-lets.

D. When an advertiser anticipatesthat the demand for an advertisedmodel, such as a close-out item,will exceed his ready supply (fromstock, from supplier or from an-other regular source), the advertise-ment should state that the quantityavailable is limited.

E. The advertiser should notdisparage by acts or words the ad-vertised product or the guarantee,credit terms, availability of service,repair or parts, or in any otherrespect.

F. The advertiser should notshow or demonstrate an advertisedproduct which is defective, unusableor impracticable for the purpose rep-resented or implied in the advertise-ment.

Product Claims

A. When an advertisement con-tains a claim as to the quaility, per-formance, or features of a particular

product, the person originating theclaim should be prepared to sup-port it by suitable demonstration orcreuible statistical data. No illus-tration should be used in any ad-vertisement which creates a falseimpression of the quality, perform-ance or features of a product.

E. Comparisons between productsof different manufacturers, when-ever made, whether on radio or tele-vision, on the sales floor or else-where, should be bona fide factualand not made in such a way as tomislead the listener or viewer. Thereshould be no unfair comparisonsbetween the advertised product andthe other product with regard toperformance, features or othercharacteristics. There should be nocomparisons under any conditionunless the advertised product andthe other product are of similarand comparable merchandise gen-erally available for purchase at acomparative price in the same tradearea or areas as the advertised pro-duct or, if not so available, thatfact is clearly disclosed.

C When an advertisement speci-fies a warranty period, but thewarranty period applies only to cer-tain parts, and not to all parts, thenthat fact should be stated.

D. The terms "Satisfaction orYour: Money Back," "10 -Day FreeTria," or similar terms, should re-fer to the return of the full purchaseprice, unless otherwise specified.

E. No advertisement containinga warranty should be published,unless the advertiser will promptlyfulfill his obligations and stand be-hind his representations.

Federal Trade Commission -Abstract Of Guides AgainstDeceptive Pricing

In determining whether or notpricing practices are violative ofthe laws administered by the Com-mission, the facts in each matter areconsidered in view of the require-ments of the Federal Trade Com-mission Act, as amended, and prin-ciples enunciated by the Courts inthe adjudication of cases. The fore-most of these principles are:

1. Advertisements must be con-sidered in their entirety andas they would be read bythose to whom they appeal.


MARCH 1962 41

Improve Your Skills By

Building a TECHNOC

TWO-WAY RADIOBy Allan Lytel. For the communicationstechnician, and those interested in enter-ing the field, this book covers mobile andfixed base stations. Theory is presentedwith a minimum of math. Antennas, se-lective calling, power supplies and testinstrument chapters are included. Photos.drawings and charts are generously used.Hard cover, 304 pages. Price $9.50.

INDUSTRIAL CONTROLCIRCUITS

By Sidney Platt. Excellent starting pointfor TV technician interested in learningabout industrial electronics. Non -mathe-matical text explains circuitry and op-eration of power controls, relays, timers.photoelectric devices and instrumentationfound in factories. Practical applicationsshown. Soft cover, 200 pages. Price$3.90.

101 WAYS TO USE YOURSIGNAL GENERATOR

By Robert G. Middleton. A line collec-tion of brief explanations on how to usethe generator for various tests. Twenty-five equipment checks are presented, sev-en antenna tests, 27 AM -FM receivertests, 28 TV tests, 10 component testsand four miscellaneous. Each descriptionbriefly lists the required equipment con-nections etc. Soft cover, 123 pages. Price$2.00.

MAGNETIC AMPLIFIERSPrinciples & Applications

By Paul Mali. Written at an intermediatetechnical level in the tried and provenpicture/text style of presentation, thisexcellent book covers: magnetism; elec-tro magnetism; saturable reactors; core,compensating and polarized magnetic am-plifiers. Well illustrated with photographsand drawings. Soft cover. 261 pages.Price $2.45.

RADIO SERVICINGTHEORY & PRACTICE

By Abraham Marcus. This, the third edi-tion, is the latest revision of a volumewhich has been, for more than a decade,one of the outstanding practical texts onradio receivers. All essential informationnecessary for a thorough understandingof radio theory and servicing is included.Well illustrated. Hard cover. 650 pages.Price $8.40.

BASICS OF DIGITALCOMPUTERS 3 (vols.)

By John S. Murphy. Using the easy -to -learn picture book technique, these threevolumes explain the theory and functionsof digital computers. Very little mathe-matics Covers counting systems, com-puter language, programming, memories,logic diagrams, flip-flops, clamping, in-put-output and data processing. Softcover, 416 pages. Price $8.40/set.

IMPEDANCE MATCHINGBy Alexander Schure. Divided into fivemajor sections, this informative bookcovers power transfer, impedance match-ing devices, matching at audio and r -f,and matching in transistor circuits. Com-plete with tables, schematics and compu-tation examples. Soft cover, 128 pages.Price $2.90.

APPLICATIONS OFELECTRONICS

By Bernard Grob and Milton S. Kiver.Assumes a knowledge of elementaryelectronics. Subjects discussed include:vacuum tubes and transistor theory;audio amplifiers; oscillators; receiver.transmitter and pulse circuits; and indus-trial and military electronics. Math iskept to a minimum. Well illustrated.Hard cover. 628 pages. Price $10.00.

HOW TO INSTALL &SERVICE AUTO RADIOS

By Jack Darr. This second edition con-tains much practical information of realuse to technicians. In addition to servicedata on antennas, intermittents, noisesuppression, speakers and troubleshoot-ing, transistorized and hybrid radios arecovered. 6-12 volt conversions are ex-plained. Soft cover. 160 pages. Price$3.25

TUBE CADDY TUBESUBSTITUTION GUIDE BOOKBy H. A. Middleton. A pocket size guidefor caddy use, includes a list of foreigntube substitutions. It covers direct sub-stitutions only and is divided into 4 sec-tions. Sec. I: lists substitutions with a"good" or "excellent" coding. Sec. 2:some ruggedized substitutions. Secs. 3 &4: European -American substitutions. Softcover. 56 pages Price $0.90.

MANAGEMENT GUIDE FORPREVENTIVE MAINTENANCE

By Bernard T. Lewis and William W.Pearson. This text, included in the pub-lisher's Industrial Management Series,outlines considerations needed for organ-izing a preventive maintenance program,systems and procedures for controllingmaintenance-including inspection andwork orders, inspection record systems.time studies, etc. Soft cover. 64 pages.Price $1.25.

INFRARED RADIATIONBy Henry L. Hackforth. From the basiclaws, through transmission and detection,to design and practical application in var-ious industries, this book details theoryand practice of infrared. Instrumentsand communications are also covered.Hard cover. 304 pages. Price $10.

VIDEO TAPE RECORDINGBy Julian Bernstein. This interesting andauthoritative reference thoroughly treatsthe system used to rebroadcast live TVprograms. Written at a level understand-able to all interested in video recording,with mathematical formulas absent. Thetext outlines methods used and circuitryemployed. Many photos and drawings.Hard cover. 272 pages. Price $8.95.

OBTAINING 8 INTERPRETINGTEST SCOPE TRACES

By John F. Rider. This handbook showshow to get the most out of your oscil-loscope. Over 800 traces are shown, in-cluding sine, square, rectangular, trape-zoid, sawtooth differentiated and intograted types. Explains scope connections,manipulating controls and test setups.Soft cover. 190 pages. Price $3.00.

BASIC ULTRASONICBy Cyrus Glickstein. This excellent book,replete with many illustrations, coversthe subject of ultrasonics from the fundamentals of sound through the varioustypes of equipment in use, to a widevariation of applications. Topics includeultrasonic generators, transducers, pulsedoutput and transistorized equipment. 144pages. Soft cover. Price $3.50.


ELECTRONIC TECHNICIAN editors have carefully selected these books

by the world's leading technical publishers. Order direct from our Book

Department. Fill in coupon or separate sheet. Money -bark guarantee.

LIII3RARY

RADIO OPERATOR'S LICENSEQ & A MANUAL

By Milton Kaufman. This sixth editiongives you the information you need topass FCC license examinations. In ques-tion and answer form similar to actualFCC tests, all eight elements are covered,including law, radiotelephone, radiotele-graph, aircraft and ship radar. Abbrevia-tions, code, etc. included. Hard cover.716 pages. Price $7.10.

HOW TO RUN ASMALL BUSINESS

By J. K. Lasser. Here is a basic businessguidebook for service dealers and otheroperators of retail and small manufactur-ing firms. Covers record keeping, avoid-ing frauds, tax management, credit sales,insurance programs, how to buy an es-tablished business, financing and otherimportant topics. Hard cover. 400 pages.Price $6.00.

Books Described PreviouslyBASIC TELEVISION 15 volsBASIC ELECTRONICS (6 vols.)CLOSED CIRCUIT 8 INDUSTRIAL TVPINPOINT COLOR TV TROUBLES

IN 15 MINUTESINDUSTRIAL ELECTRONICS HANDBOOKAUDIO MEASUREMENTSELECTRONICS IN INDUSTRYHOW TO SERVICE TAPE RECORDERSFUNDAMENTALS OF RADIO TELEMETRYHOME AIR CONDITIONING INSTALLATION

8 REPAIR S 3.50SERVOMECHANISM FUNDAMENTALS S 5.50ELECTRONIC COMMUNICATIONS $13.00BASIC AUDIO 9.95MODERN TRANSISTOR CIRCUITS S 8.50PHOTOTUBES S 1.80MARINE ELECTRONICS HANDBOOK S 3.95GUIDE TO MOBILE RADIO S 2.85MASTER RECEIVING PICTURE TUBE

SUBSTITUTION GUIDE S 7.45SMALL APPLIANCE SERVICING S 4.50A -C MOTOR CONTROL FUNDAMENTALS 5 5.95PIN POINT TRANSISTOR TROUBLES IN

12 MINUTES S 5.95HOW TO USE METERS S 3.50BASIC CARRIER TELEPHONY S 4.25101 WAYS TO USE YOUR AUDIO TEST

EQUIPMENT 5 2.00BASICS OF INDUCTION HEATING S 7.802 -WAY MOBILE RADIO HANDBOOK S 3.95SERVICING TRANSISTOR RADIOS ... S 2.90GETTING THE MOST OUT OF VACUUM

TUBESHOW TO TROUBLESHOOT TV SYNC

CIRCUITS

To order above books, writein title and price on coupon

511.25513 85S 4.95

S 5.95$22.50S 2.90S 8.50S 2.90S 2 95

S 3.50

$ 2.90

SERVICING UNIQUEELECTRONIC APPARATUS

By Jack Darr. This book explains basicoperating theory and practical servicingtechniques for troubleshooting and repaitof a variety of unique electronic devicesused primarily for industrial applications.Covers ultrasonic cleaners, diathermy,automatic flow control, photo -flash andothers. Schematics, drawings and photo-graphs included. Soft cover. 126 pages.Price $2.50

100 ELECTRONIC CIRCUITS

By Milton Aronson & Charles Kezer.Here is a useful basic circuit referencebook covering a wide variety under eightmajor sections, including power supplies,amplifiers, oscillators, pulse circuits, testinstruments, alarms, phototubes and mis-cellaneous. In addition to the schematic,a page or two of text accompanies eachcircuit, explaining the operation andcharacteristics. Soft cover. 180 pages.Price $2.00.

ELECTRONIC TECHNICIAN Book Dept.

480 Lexington Avenue

New York 17, N. Y.

REPAIRINGTRANSISTOR RADIOS

By Sol Libes. How transistor theory op-erates in radio circuits and servicing pro-cedures is thoroughly discussed. Eachradio stage is covered with a service chartthat indicates "Trouble," "PossibleCause," and "What to Look For." Excel-lent coverage is given to AM, FM andauto radios. Interchangeability chart isincluded. Well illustrated. Soft cover.168 pages. Price S3.50.

BASICS OF FRACTIONALHORSEPOWER MOTORS

AND REPAIRBy Gerald Schweitzer. In this book theauthor examines: the operation of variousmotor types, including split -phase, ca-pacitor, repulsion, shaded pole, universaland three-phase motors; enclosures, wind-ings, control devices and protective de-vices. Two sections are devoted to motortesting, care and maintenance. 176 pagesSoft cover. Price $3.90.

CUT HERE -

3-62

I plan to build my technical library. Please send me the books I have indicated below.You will pay postage. I understand that if I am not satisfied with any book for anyreason, I may return it to you prepaid in good, dean condition within 7 days of receiptand receive a complete refund. Shipments outside U. S. & Possessions, add 205/bookfor soft cover, 40f/book for hard cover.Enclosed is my check or money order, in full payment, made out to ELECTRONICTECHNICIAN.

. . Two -Way Radio @ S 9.50Industrial Control Circuits @ S 3.90

. . . 101 Ways to use Your SignalGenerator @ S 2.00

. Magnetic Amplifiers @ 5 2.45

. Radio Servicing Theory IL Practice @ S 8.40. Basics of Digital Computers @ S 8.40. Impedance Matching @ S 2.90. Applications of Electronics @ S10.00. How to Install & Service Auto

Radios@ $

3.25. Tube Caddy Tub* Substitution Guide

Book @ S 0.90. Management Guide for Preventive

Maintenance @ 1.25

Enclosed is total payment of $(If you have New York City address, add 3%

Infrared RadiationVideo Tape Recording

. Obtaining and Interpreting TestScope Traces

. Basic Ultrasonics. . Radio Operator's License a a A

Manual. How to Run a Small Business. Servicing Unique Electronic

Apparatus. 100 Electronic Circuits

Repairing Transistor Radios. Basics of Fractional Horsepower

Motors & RepairBOOKS IN PREVIOUS ISSUES,

sales tax)

510.00

5 8.95

S 3.00S 3.50

$ 7.10@ S 6.00

@ S 2.50@ 2 00@ S 3.50

@ S 3.90@ s

Name

Address

City Zone State

Here's why color sets made byyou can service so easily and

The Most Trusted Name In Television TMK (S) I

44 MARCH 1962

RCAVICTOR are the oneswith such confidence!

1 RCA VICTOR'S color TV chassis has been performance -provedfor over seven yearsRCA Victor's new Super Power Chassis incorporates more than seven yearsof refinements based on field and service experience! Features include:easy access and chassis "remove -ability"; easy -to -find, accessible test points;new Push -Button Circuit Breaker that eliminates "annoyance" calls.

2 RCA VICTOR'S "Roadmapped" Security Sealed Circuit Boardsmake servicing easierRCA Victor Security Boards are dependable. This is themodern way to build television receivers! They are "roadmapped" andnumbered with you and your job in mind.

3 RCA VICTOR'S replacement parts are performance -provedProved -in -use replacement parts-another by-product of seven years ofintensive research, study and experience.

4 RCA VICTOR'S proved -in -practice service notes and literatureThose who know Color TV best learned it through RCA with help fromRCA Color TV information bulletins, service data, schematic diagrams-all designed by RCA for the proper development of Color TV as an indus-try-a going, profitable business for you!

Join the Color "Corps" now. Get to know more about it, advertise, selland talk Color TV-build a more profitable business! Ask your RCA VictorDistributor to help you!

ELECTRONIC TECHNICIAN 45

SHOP HINTSTIPS FOR HOME AND BENCH SERVICE

Novel Tool HoldersA few pieces of Styro-foam,

available in some five -and -ten -centstores, make excellent holders for

Novel tool holders made from Styro-foammaterial keep small tools handy.

many small tools and other itemsfound around the work bench. Thismaterial can aid in keeping an other-wise cluttered -up bench clean andsmall tools can be easily found ata glance. Items are merely "stabbed"lightly into the material and whenneeded can be easily removed. -William R. Lacy, Syracuse, N. Y.

Radio Hum IntermittentThe other day a small table ra-

dio was brought into the repairshop with symptoms of severe 60cycle hum. Upon examination ofthis set, the service technicianfound that the hum temporarilywent away if the power switch wasfirst "flicked" off, and then on.

Sets exhibiting symptoms such asthese frequently employ a multiplesection filter capacitor. The troublearises when the common lead whichinterconnects the foils develops ahighly resistive contact with one ofthe sections. This permits hum tobe internally coupled from the de-fective section to those which arefunctioning normally and the filter-ing action is reduced. Flicking theset off and then on permits heavycapacitive charging currents to flowthrough the resistive contact andtemporarily weld the bad connec-

tion. Unfortunately, the weld is notsatisfactory and the connection be-comes resistive once again after ashort period of operation.

The cure is, of course, replace-ment of the entire filter capacitor.-P hilc o Service -Businessman,Phila., Pa.

Polish Scuffed Plastic TV ScreensWhen a portable or other TV

arrives in the shop with a scuffedplastic face, the simple procedureoutlined here will almost completelyeliminate the scuffs, and reduceeven deep cuts so they are lessnoticeable. Minor scuffing is com-pletely eliminated.

Obtain some plaster -of -Parispowder and mix with "Lubriplate"until you have a smooth paste.Place some on the plastic which isto be treated and rub with a circularmotion, using a piece of clean cot-ton or linen cloth. Concentrate firston the badly scuffed area with smallcircular motions and gradually in-crease the size of the circular sweep.Watch the surface clear up almostlike magic. This will come in mightyhandy if a receiver gets scuffed intransit from the customer's home tothe shop.- M. G. Goldberg, St.Paul, Minn.

Loctal Tube ConversionsScarcity and cost of some "loctal"

type receiving tubes make conver-sions desirable from the customerspoint of view, and the techniciancan profit also.

We have found that a 7 pin

SHOP HINTS WANTED!53 to $10 for acceptable items. Usedrawings to illustrate whenever nec-essary. A rough sketch will do.Photos are desirable. Unacceptableitems will be returned if accompaniedby a stamped envelope. Send yourentries to Shop Hints Editor, ELEC-

TRONIC TECHNICIAN, 480 LexingtonAve., New York 17, N. Y.

printed circuit socket has the sameradius as loctal pins. Conversionrequires only removal of the loctalsocket's prongs, not the socket it-self. There are 8 holes, but only 7pins-the printed circuit socket canbe rotated to obtain best advantageof the terminal connections, and theoriginal leads are then connectedto the new socket tabs.

With a 14B6 at $5.60, and a12AV6 replacement at $1.65, thespread makes the deal profitableboth ways. - Willard W. Waite,Wellington, Ohio.

VTVM Probe -Lead ModificationI have eliminated the inconven-

ience of 3 test leads on my EICOmodel 221 VTVM in the followingmanner:

The ohms/ a -c input and the com-

SP D TS WITCH

TO OHPAS/A-C AN PUT TO D -C INPUT ONON FUNCTION SWITCH FUNCTION SWITCH

i .-,.....,_tC MEG

OHMS/A-C/D-C PROBECOMMONLEAD

VTVM probe -lead modification employs as.p.d.t. switch to simplify meter use.

mon or ground leads are first re-moved. The common jack is re-moved from the chassis and a single -pole -double -throw toggle switch isinstalled in the same mounting holeafter the hole is enlarged.

The common lead is permanentlyinstalled in the a -c/ ohms jack andgrounded. The 15 megohm resistorin the d -c probe is removed and oneside of it is connected to one toggle -switch contact and the other end isconnected to the d -c input on themeter's function switch. The othertoggle -switch contact is connecteddirectly to the ohms/ a -c input tapon the function switch.

These changes do not endanger


EASY

WITH

"ET"

TUNG-SOL.TRANonatlfriXCIF1 S

PICK THE ONE

MARKED FOR

THE JOB!

Tung -Sol "ET" transistor packagesare marked to eliminate guesswork inselecting the correct replacement forevery job. Type numbers, class ofservice and junction polarity is stampedon each end flap. This is a time savingfeature as well as a safeguard againstservice slip-ups. Tells you at a quickglance where your inventory stands.

The compact " Er line was engi-neered by Tung -Sol specifically toeliminate confusion in entertainmentservice resulting from almost endlesssimilarity and duplication of types.Eleven PNP and NPN units replacehundreds of older transistors. "ET"

ET - 7NI -POWERAMP- PNP

TRANSISTOR

transistors measure up fully to Tung-Sol's one high standard of excellenceand reliability. The most advancedquality evaluation techniques assureproduct uniformity, lot after lot.

When you order transistors, specify"ET." High turnover with low inven-tory and customer satisfaction willshow that it's the profitable way tobuy transistors.Tung-Sol Electric Inc.,Newark 4, New Jersey.

TUNG-SOL

A TYPE FOR EVERY JOB

LAPNP TYPES

Low powerET1 Mixer/oscillator/

converterET2 IF amplifierET3 AF amplifier 6v.ET4 AF amplifier 12v.ET5 AF amplifier 9v.Medium powerET6 AF power amplifierHigh powerEll AF high power

amplifierNPN TYPES

Low powerET8 Mixer/oscillator/

converterET9 IF amplifierETIO AF amplifier 9v.ET11 AF amplifier 12v.

MARCH 1962

Ask your DIstributo, for the Tung -Set Transistor intere aaaaaaa Illty Guide


47

"I've gotsatisfiedcustomers

andprofits...

by improving communications equipment reliability withIERC Heat -dissipating Electron Tube Shields!"Extra profits in contract servicing are yours with TR type heat dissipating tube shields-at installation, of course, and from the 2 to 12 time increase in tube life and reliabilitythey provide. Electron tube failures, caused by heat, account for almost 70% of equip-ment failures. Service profits go out the window when valuable work, other service callsor "off hours" time must be given to meet service contract requirements just to changea tube! You can eliminate this problem oy increasing the tube life and reliability of yourcustomer's communications equipment with TR's - time proved in vital military, aero-space and precision electronic equipment applications A complete installation of TR's inalmost any equipment takes only a few minutes-reliability and profits are immediate!

patented

IERCheat -dissipating

SERVICE TECHNICIANS-Write today for complete data on!ERC TR shields.

ED 0M0 0©aelectron tube shields.

International Electronic Research Corporation135 West Magnolia Boulevard, Burbank, Californiaheat -dissipating tube shields for miniature, subminiature, octal and power electron tubes

- -- for more details, circle 29 on page 50

SHOP HINTS

the meter or circuits in any way,nor does it upset the normal operat-ing function of the unit. It is nowvery easy to flip a switch, pick uptwo probes, and use the meter withease for any measurement. - Har-old Wolff, Jr., Gonzales, Texas.

Altered Wrench For Hex -HeadScrews

Transformers and other compo-nents are frequently mounted inradio and TV sets with thin hex -

1

Altered hex -head wrench facilitates 1/4"screw removal in hard -to -get -to places.

headed self -tapping metal screws.These are sometimes difficult tograsp with a regular hex wrench. Ihave found that a taper -ground tipof a 'A " wrench is a great tool forremoving these screws when theyare located in close quarters andhard -to -get -to places. - Bud Mier -key, Largo, Fla.

. . . Trouble ShootingContinued from page 37

rather than the center as well as theextremes shown for the Losser typenetwork in Figs. 4B and 5B.

It is not unusual for a customerto complain of insufficient boost orcut. Your bench tests at 50 and10,000 cycles will probably showthe controls to be operating satis-factorily. Visual examination isvery likely to prove the circuit tobe of the Baxendall variety.

The answer to this is in the twocurves. Because the Losser typeaf:ects the mid frequencies more,the effect is more obvious.

Actually, the Baxendall networkis probably preferable. The feed-back reduces distortion. The systempermits control over that portionof the curve where most boost orcut is necessary. The apparent in-sufficient boost or cut does not con-demn the network, but some otherweak link in the hi-fi chain. Findthis weak link and you will probablyhave a new component sale on yourhands.

48 ELECTRON -IC TECHNICIAN

C

A OJz-1 V

CAUTION ON NIGH VOLTS

Off1200300

1 2-

60

3-1 2A-

6000200

--300 A-60

-12 V OUTPUT

-xc -Oki

-x 10 rt

-x .1000-X 100 000

J V fl.A.

FACTS MAKE FEATURES:

23

QU ITY IS HID

USES UNLIMITED.Field EngineersApplication EngineersElectrical, Radio, TV, and Appli

ServicemenElectrical ContractorsFactory Maintenance MenIndustrial Electronic Maintenance

TechniciansHome Owners, Hobbyists

FUSED.

S MPLE TORIPLACEMULTIPLIERSOR SHUNTS

HEAVYINSULATED CASE

Popular streamlined tester with long meter scales ar-ranged for easy reading. Fuse protected.

Single control knob selects any of 32 ranges-less chanceof incorrect settings and burnouts.Four resistance ranges-from .1 ohm reads direct;41/2 ohm center scale; high 100 megohms.

Attention to detail makes the Triplett Model 630 V -O -M a lifetime investment.It has an outstanding ohm scale; four ranges-low readings .1 ohm, high100 megs. Fuse affords extra protection to the resistors in the ohmmetercircuit, especially the XI setting, should too high a voltage be applied. Accuracy 3% DC to 1200V. Heavy molded case for high impact, fully insulated.

1630A same as 630 plus 11/2% accuracy and mirror scale only $59.50

TRIPLETT ELECTRICAL INSTRUMENT COMPANY, BLUFFTON, OHIO

BAR RINGal:ELDED

MC YEMENT EASY TO CHANGESTANDARD BATTERIES

HIGH FLUXMAGNET,

SPRINGBACKEDJEWELS

-FORRUGGEDNESS

SPARE FUSE

COMPLETE_YWIRED CIKUIT

RANGESDC VOLTS 0 3 12 60-300-1,200-6.000

at 20,000 ohms per volt.

AC VOLTS 0-3-12-60.300-1,200-6000at 5,000 ohms per volt.

OHMS 0-1,000-10,000.

MEGOHMS 0-1.100

DC MICRO-AMPERES 0-60 at 250 millirrolts.

DC MILLI-AMPERES 0.1.2-12.120 at 250 millivolts.

DC AMPERES 0-12.

08: -20 to +77 (600 ohm line at 1 MW).

OUTPUT VOLTS: 0-3-12-60-300-1,203; jack withcondenser in series with AC ranges. _A

. . for more details, circle 56 on last page

610

630-A 630 -PL 630 -APL 630 -NALill

630-T 631 666-HH 800 666-R

THE WORLD'S MOST COMPLETE LINE OF V -O -M'S. AVAILABLE FROM YOUR TRIPLETT DISTRIBUTOR'S STOCK

FREE LITERATURE

To recieve the literature below without charge, simply circle the number on the coupon

1Antennas: Literature on citizensband antennas include three new

models. Covered also are antenna ac-cessories and the DB-27 display. An-tenna Specialists Co.

. . . for more details, circle 301

2 CB Transceivers: Literature coversa 5 -watt, fully transistorized citizens

band transceiver. Cadre Industries Corp.. . . for more details, circle 302

3Capacitors: A "Periodic Table" cov-ers 18 major types of capacitors.

Electrical and operating characteristics,and formulas employed in circuit designincluded. Chart measures 3'x2'. Cornell-Dubilier Electronics.


4Package Shipping: Literature coverscomparative costs by bus, rail ex-

press, air freight. Gives facts on prod-ucts carried, weights, sizes, service, speedand frequency. Greyhound Corp.


5 Loudspeakers: Specification sheetCSP- 102 gives complete technical

details on new model K-950, 8" 2 -waycoaxial distributed sound loudspeaker.Jensen Mfg. Co.


A Home Study Courses: Booklet cov-ersW a number of home study cours-

es including: Television Servicing; Com-munication Electronics; AutomationElectronics; Computer Programming;Transistors; and Color Television. RCAInstitutes, Inc.


7Suppressors: Catalog 61-KV-10 cov-ers "Klipvolt" selenium transient

voltage suppressors for reduction oftransient voltages generated by motors,relays and switches. Available in polar-ized designs for d -c applications; non -polarized for a -c. Sarkes-Tarzian, Inc.


8Rectifiers: Illustrated bulletin S-105covers diffused silicon controlled

rectifiers. Includes ratings, characteris-tics, performance data, applications andspecifications. Semicon, Inc.


CUT HERE

10

11

12

13

14

15

16

17

18

19

2021

22

n Transistors: A new chart lists7 ap-proximately 2,000 transistor types

most commonly used in TV, radio, hi-fi, auto and home equipment, with man-ufacturer's number and replacement. In-cludes base diagrams of five types show-ing locations of the leads. One section isdevoted to the firm's American -made re-placements for Japanese and other for-eign made transistors. Chart measures17"x22". Semitronics Corp.


Parts: Kit, model 31T 3890, cov-ered in literature, contains mech-

anical and electrical parts to be used inconjunction with Sec. II of StandardCross Reference Guide; and make up90% of replacement parts most common-ly used in field service. Standard Kolls-man Industries, Inc.


11Antennas: Literature covers: T-

1 Bird (non -powered) antennas, sixmodels; and T -Bird (powered) antennas,three models. Features include 7/16"tubing and "Delta" ("T" match) feedsystem. Technical Appliance Corp.


10

Cut out and mail to ELECTRONIC TECHNICIAN, 1 East First Street, Duluth 2, Minn.

Use this coupon, or your letterhead, before April 20, 1962Please send me literature of companies whose code numbers I have circled below ;includes editorial and advertised items):

ADVERTISED PRODUCTS

23 3624 37

25 38

26 3927 4028 41

29 42

30 4331 44

32 45

33 46

34 47

35 48

49

50

NEW PRODUCTS

51400 404 408 412

52 401 405 409 413

53 402 406 410 414

54 403 407 411 415

55

56

57 FREE LITERATURE, CATALOGS, BULLETINS58

59 301 305 309 31460 302 306 310 31561 303 307 311 31662 304 308 312 317

63 313 318

3-62

Name Position

Firm Address

City Zone State

Note: If you have given your residence address, please enter your company name and address on this line:


TVL TWIST-LOK®CAPACITORS

These lyticstake on the toughest

TV and radio duty, give maxi-

mum trouble-free service, without

HUMMM! They are dependable

at extremelyhigh and low tem-

peratures. Cathodes are etched

to meet the needs of high ripple

currents, high surge voltages.

TVA ATOM-,CAPACITORS

Atom tubulars are service favor-ites because they fit anywhere,work anywhere. They're the onlysmall size 85 C (185 F) capaci-tors in ratings up to 450 WVDC.They have low leakage current,long shelf life, and withstandhigh ripple currents, high surgevoltages.

VL VERTI-LYTIC*CAPACITORS

These single -ended molded tu-bulars are the ideal replacementfor units of this type found onprinted wiring boards.Keyed terminals assure fast man-ual mounting and correct polar-ity. Resin end fill protects againstdrying of electrolyte or entranceof external moisture.

PCCAPAL PRINT-LOK®CITORS

The printed circuit version of

the Twist-Lok.Universal base

replaces any of the printed cir-

cuit 'lyrics in use today. No

makeshift mountingadapters to

damagecapacitor or add extra

height . - no possibilityof high

resistance contacts.

TE LITTL-LYTIC®CAPACITORS

Thevery best ultra -miniaturere-placements fortransistorcircuits,offering unusual reliabilitythrough al

construction.No pressure joints to causeLong she.f life- circuits."open" 0: intermittent

extremelyim-portant in sets used only pan ofthe year.

very ratingvery style

Shown here are the more popular of Sprague's big familyof Electrolytic Capacitors, the broadest in the industry.Other types include Metal -encased Screwbase; Plastic -encased High-MF; Metal -encased Octal -base; Ultra -lowleakage Photoflash. All are listed and described in Sprague'sNEW Catalog C-614. Get your copy from any Spraguedistributor, or write Sprague Products Company, 65 MarshallStreet, Norh Adams, Massachusetts.

SPRAGUE®THE MARK OF RELIABILITY

WORLD'S LARGEST CAPACITOR MANUFACTURER

MARCH 1962


51

NEW PRODUCTS

G -E TV RECEIVERSThree new TV receivers are: "The

Century," 19" luggage style portable;has power transformer chassis, chromecarrying handle and 6"x2" front mount-ed speaker; three luggage finishes; $169to $179. The "Fashion Designer," 21"table model; has power transformer chas-sis. front controls and front speaker;two cabinet finishes; $199 to $209. The"Golden Celebrity," 19" portable; haspower transformer chassis, fold -awayluggage carrying handle and power cordwind-up bracket at rear of set; threecabinet finishes; brass -finish roll -aboutstand and magazine rack offered freewith "Golden Celebrity" but price of setnot announced. Radio & TelevisionDivision General Electric Co., Elec-tronics Park, Syracuse, N. Y.

. for more details, circle 400 on page 50

Fisher ADAPTORMultiplex adaptor, model MPX-200,

companion to Fisher Universal MPX-100,is designed especially for those who de-sire a unit for concealed installation. Itis self -powered, compact and easily con-

nected. Can be placed up to three feetfrom the tuner or receiver. Features in-clude: special control for matching ex-actly to the tuner or receiver with whichit is used, requires setting only at timeof installation; two controls to assureidentical output levels from both chan-nels; and selector switch to record stereoprograms monophonically. Internal cir-cuitry contains a 15 kc steep roll -off,low-pass filter for suppression of the 38kc sub -carrier and side -bands. $79.50.Fisher Radio Corp., 21-21 44th Drive,Long Island City 1, N. Y., . . for more details, circle 401 on page 50

Conar GENERATORSModel 280 signal generator uses Hart-

ly-type oscillator circuitry for stabilityplus pre-set, tuned r -f coils on low bandsand ceramic trimmers on high bands.Average accuracy, without further align-ment, 2%. Frequency coverage, 170 kcto 60 mc on six bands; 60 mc to over120 mc on harmonics. Planetary drive

tuning capacitor with 6:1 ratio eliminatesbacklash. Has solid state power supply.Kit, $21.50. Wired, $29.50. Conar In-struments Div., National Radio Institute,3939 Wisconsin Ave., Washington 16,D. C.

. . for more details, circle 402 on page 50

Mercury TUBE TESTERSDeluxe model 1200 dynamic mutual

conductance tube tester features push-button settings to permit testing of anytube, under actual dynamic conditions,in a few seconds. It tests new type tubesincluding nuvistors, novars, compactronsand new 10 -pin tubes; foreign and hi-fitubes, voltage regulators, battery typetubes, auto hybrid tubes, thyratrons andmost industrial tube types; black andwhite picture tubes, transistors, andbatteries. Range of operation includestests for true dynamic mutual conduc-tance (Gm), tests for shorts and leak-age between any tube elements, and forgas and grid emission. Has automaticline voltage regulation, 41/2" meter;built-in 7 -pin and 9 -pin straighteners on

panel; and phosphor bronze tube sockets.Housed in leatherette case with compart-ment for cables. 181/4" x 101/2" x OA".$119.95. Mercury Electronics Corp., 1 1 1Roosevelt Ave., Mineola, N. Y.. . . for more details, circle 403 on page 50

SylvaniaRADIOS & TV RECEIVERS

Supplementing 1962lines, and intro-duced as "drop in" models at the Inter-national Home Furnishings Market are:Table radio models, AT15 and AT16,provides 6 -tube performance with onerectifier, 4" front -mounted speaker, di-

rect drive tuning, built-in ferrite rodantenna and engraved circuit chassis.6"H, 131/2"W, 57/6"D. $19.95 and$22.95. Also models 19P11B and19P11E, newly styled versions of 19P11,19" portable TV receiver. The 19P11luggage -style cabinet has a wrap -aroundmetal midsection and molded plasticfront and back, is equipped with thefirm's Bonded Shield picture tube andSuper S-110 engraved circuit chassis,3x5 -inch speaker is mounted on top ofset and angled toward the viewer, hastop controls and chrome monopole an-tenna. New version 19P11B has weight -balanced plastic carrying handle. Deluxemodel 19P11E has metal carrying handle.Sets are 121/2" deep. Weight, 40 lbs. Ametal stand with 3 -inch casters has beendesigned for each of the new portablemodels. Model 19P11B with stand$159.95. 19P 1 IE with stand, $169.95.Radio & Television Div., Sylvania Elec-tric Products, Inc., Batavia, N. Y.

. for more details, circle 404 on page 50

University SPEAKERSShown are two Uniline columns now

available in PA loudspeakers. ModelUCS-6, 60" column (6 extended -range8" speakers); frequency range, 35-17,000cps; 150 watts IPM; impedance, 16 ohms.$179.95. Also model CS -4, 40" column(4 extended -range 8" speakers); fre-quency range, 45-17,000 cps; 80 wattsIPM; impedance, 8 ohms. $129.95. Soonto follow will be a lower powered speechmodel and a weatherproof music and

/=lembaNnwe

111111411110111111

speech model. University Loudspeakers,Inc., 80 S. Kensico Ave., White Plains,N. Y.



ItAO PA EAST CCAS', r 0 ( , 52,11 EST COAST.

The truck that thinks it's a station wagon.

We made it with seats and windows.But a truck is what it is.

Take out the seats and you can put in1,786 pounds of anything.

In just about any size or shape. T^edoorway's almost 4 feet wide.

For business deliveries, this Volkswagencosts so little to run that you can moice aprofit even on dinky orders.

2/2R a mile seems to be average formost owners. For gas, tires, everything.

(Almost all our trucks get over 20miles a gallon. Some even get 30.)

For weekends, you can take 8 relativesanywhere you might wont to take 8 rela-tives.

you're just taking them away, there'sroom for their luggage on the rear shelf.

All their luggage.)We call this the Volkswagen Kombi.All the usual VW virtues go with it

Rear -engine traction in snow and sand.Tha air-cooled engine that can't freeze

up or boil over. And the price,another interesting VW virtue.

$2,095.*New.

MARCH 1962- - - for more details, circle 61 on page 50

53

General Electric reporter,Roland Kempton, makes the rounds withthe independent service dealers . . .

Don Ellis saved

30 minutes

and $3.75

because

one G -E

SERVICE -DESIGNED

capacitor takes

the place of 4ordinary typesIn minutes and money, Don Ellis and GeorgeBentley, owners of QUALITY TV, Kansas City,Mo., measure some of the advantages of stockingG -E Service -Designed capacitors. Don (shownhere) put it this way, "We didn't stock can -typecapacitors before because we never knew whattypes we'd need. Now, with just 25 or 30 capaci-tors in stock we meet most of our requirements,and we don't have to make special trips to pickup exact replacements. I figure this saves 30minutes and $3.75 per trip."

And according to George, "There have beenmany occasions, especially on Saturdays, whenwe've been able to get the set out because we'vehad G -E capacitors in stock. Our customersreally appreciate it, and we haven't had a singlecall back."

Yes, it pays to stock General Electric Service-Designed capacitors. Get full details from yourG -E capacitor distributor. General ElectricCompany, Electronic Components Division,Room 1719, Owensboro, Kentucky.

13ogress Is Our Most Important Roduct

GENERAL ELECTRIC

CC ELECTRONICS

Xe0-40A Mir

A NsA'4141,

XC2 14IsvjOrat

(C 1 74.

1481.14wr, »....,141

ithAL L

CA P c

}C3 4 0

GAM =MtXC4-10 XC4.70 XC3.40. 5.4 W , 44213410

1 411 41,2144 w WWw 21 ;aw

Another New Service AidFrom General Electric

SERVICE -DESIGNED

Capacitor TabAdjuster savestime-easier touse than pliers"How soon can I get a coupleof them?"That was Don Ellis' firstcomment after he tried outthis new tab adjuster. Thishandy Service Aid from Gen-eral Electric is easier to usethan needle -nose pliers-saves time on service callsand at the bench. The slottedend fits over capacitortabs; won't slip off. Aquick twist locks or un-locks the tabs. 8 incheslong; plastic handle.Here's one of the mostuseful Service -Designedtools for the bench and inyour service case. Ordernow from your G -E capac-itor distributor or mailcoupon to Chicago ware-house address shown.

r F3, Is Ovr Most imporknt Tiodoes.

GENERAL ELECTRICGeneral Electric Company, Dept. B3800 N. Milwaukee Ave., Chicago 41, Ill.Please ship prepaid:

ETR-2968 Capacitor TabAdjuster, $1 each.My check or money order is enclosedfor the required amount plus any salesor use tax applicable in my area.NameAddressCity Zone Stale

&-


MARCH 1962

.11 NEW PRODUCTS

Zenith RADIOSRoyal models 90, 125, and 650 small

size transistor radios use new advanceddesign "Powersonic" transistors forgreater sensitivity and range. Both royal90 and 125 provide 80 milliwatts poweroutput and have automatic volume con-trol. Each plays 180 hours on two mer-cury batteries, or up to 75 hours withtwo penlite cells. Royal 125, deluxe indesign, and equipped with vernier tun-ing dial. $26.95 and $29.95 respectively,less batteries. Royal 650 personal -sizeportable has 31/2" cone speaker, pro-vides 200 milliwatts of power output,has inverse feedback circuit, operateson 4 mercury cells or 4 penlite batteries.$34.95, less batteries. Empress modelFM -AM clock -radio with afc has sleepswitch, radio buzzer alarm, applianceoutlet, AM -AFC -FM and FM selectorswitch. $69.95. Dreamland model AMclock -radio has a radio and buzzer alarm.$29.95. Trumpeteer model table radiohas advanced AM chassis and directtuning control. $19.95. Executive modelhas AM chassis in a cabinet only 31/2"deep, 6"x4" speaker and automatic vol-ume control. $29.95. Conelrad or CivilDefense station frequencies, clearly indi-cated on dial scale of each radio. Allmodels available in a variety of cabinetcolors. Zenith Sales Corp., 6001 W.Dickens Ave., Chicago 39, Ill.. . . for more details, circle 406 on page 50

Sprague CAPACITORSEK-5 Verti-Lytic capacitor assortment

consists of 30 miniature single -endedelectrolytic capacitors (two each of the

15 most -frequently -used ratings) in anattractive blue case which has indi-vidually identified compartments. Space -saving Verti-Lytics, with their moldedphenolic cases and moisture -resistantresin and seals, have low leakage cur-rent and long shelf life. Ideal for verti-cal mounting on printed wiring boardsin crowded transistorized radios. Handyplastic case, free. Capacitors, $31.92.Sprague Electric Co., North Adams,Mass.. . . for more details, circle 407 on page 50

Switchcraft CORDSMolded replacement headphone cords

for Brush and RCA headphones featurea standard parallel cable with gray col-ored plastic jacket over two tinsel con-ductors #27 ga. Standard 2 -conductorphone plug with cable clamp is moldedsecurely to one end of cable. Molded"Y" junction strengthens the "Y" ter-

mination. They are recommended forreplacement on most mono headsetcables and are exact replacements forcable on Brush BA -200, BA -205 andBA -206 headsets; also RCA MI -38107Bheadset. No. 05KF88 has 2 feet of cablefrom phone plug to "Y" junction, $3.00.No. 05KJ88 has 4 feet of cable fromphone plug to "Y" junction, 1 foot ofcab:e from "Y" junction to eyelet plugs,$3.20. Switchcraft, Inc., 5555 N. ElstonAve., Chicago 30, Ill.. . . for more details, circle 408 on page 50

Winegard ANTENNASIntroduced are two new amplified FM

antennas reported to pick up 85% ofall FM stations in a 200 mile radius from

any location over normal terrain. ModelPF-8 Stereo-Tron Yagi, gold anodized,minimum gain, 26 db over a folded di-pole, flat frequency response, -1/4 dbfrom 88 to 108 mc. Features built-inTV -FM coupler and has 8 elements with"Tapered T" driven element directlycoupled with the transistor amplifier.Available two ways: model PF-8 for300 ohm twin lead; PF-8C for 75 ohmcoax. Electronic turnstile, also goldanodized, non -directional, 16 db gainin all directions over a folded dipole.Has offset mount and transistor ampli-fier with built-in TV -FM coupler. TheElectronic Turnstile model PF-4 has300 ohm output only. Both models canbe used with one power supply anddown lead when used with a WinegardPowertron TV antenna. Winegard Co.,Burlington, Iowa.. . . for more details, circle 409 on page 50

Knight TUNERSModel KN-250M ultra -compact stereo

FM tuner features advanced transistor-nuvistor design for both FM stereo and

regular broadcast reception. Intended foraddition to existing stereo hi-fi systems,it is not much larger than the averagebook. Dimensions, 2-1/4 x 9-34 x 8

55

HI NEW PRODUCTStttasa

inches. Housed in dark brown metalcabinet, designed for perfect match withKN-400B amplifier. Has built-in multi-plex circuit. Single strength meter showsquickly when tuning in on center chan-nel for peak strength. Usable IHFMsensitivity, 2 krvolts for 30 db of quieting.$139.95. Also, not shown: similar unitwithout stereo FM, $99.95; and KN-2 5 0 M C with built-in clock timer,$154.50. Allied Radio Corp., 100 N.Western Ave., Chicago 80.. . . for more details, circle 410 on page 50

Sencore SUBSTITUTORSModel RC121 component substitutor,

a new compact unit, is designed for on -the -spot substitution of carbon and power

resistors, capacitors, electrolytics andrectifiers. Each section offers a completerange, can be used independently. and

OVERHAULED BY

CASTLETV TUNER SERVICE. INC.

Pioneers in TV Tuner Overhaul

THAT SOLVES ALL YOUR TV TUNER PROBLEMS

. . . do you have the time to fool around drilling,sawing, filing . . . trying to make a "Universal"replacement tuner fit in place of the original?... do you have all the expensive instruments andequipment to complete the alignment so essentialafter each tuner repair or replacement?... can you spare the time repairing and adjustingyour own TV tuners and can you charge enoughto justify the time spent?A Castle Overhaul eliminates every one of these problems.Castle replaces all defective parts, (tubes andmajor parts are extra at net prices) and thenaligns your tuner to the exact, original specifi-cations.Simply send us your defective tuner complete; in-clude tubes, shield cover and any damaged partswith model number and complaint.

Send for FREE Mailing Kit and complete details.

CASTLE p,,,TV TUNER SERVICE, INC.5/10 N. Western Ave., Chicago 45, Illinois 653 Palisade Ave., Chtfside Park. New Jersey

In Canada: 136 Main St., Toronto 13, Ontario

ONE PRICE

995

ALL MAKES

VHF TUNERSUHF TUNERSUV COMBINATIONSUV combination tunermust be of one piece con-struction. Separate UHFand VHF tuners with cordor gear drives must be dis-mantled and the detectiveunit sent in.

90 Day Warranty

IV Tuner Overhaulin,


is identical to the equivalent single unit(H36, ES102, PR111 and RS106) ex-cept for the electrolytic which is vastlyimproved. It allows substitution for alldual electrolytics as well as singles. Over25 combinations of capacitor values canbe substituted by using the electrolyticsas singles, duals or paralleling them todouble capacity. Surge protector preventsarc, spark or heating of capacitors beingbridged and automatically dischargesboth electrolytics when released. $39.95.Sencore, Inc., 426 S. Westgate Drive,Addison, Ill.

. . . for more details, circle 411 on page 50

Ward CB ANTENNASDesigned around their "8" -ball con-

cept, a new L -Coil Citizens Band an-tenna is said to work equally well oncitizens band frequencies and on AMbroadcast reception. Dual L -Coil an-tenna comes in kit form which can beeasily installed in present mounting po-sition on most cars and trucks. WardProducts Corp., Edson St., Amsterdam,N. Y.. . . for more details, circle 412 on page 50

Hitachi TAPE RECORDERSModel TRQ-370 seven transistor port-

able tape recorder has two speeds, 3-3/4inch/sec, and 17/i inch/sec, with a max-

imum recording time of 68 minutes. Has"fast forward" speed-up device, singledial "one -control system" and levelmeter. Operates on four flashlight cellbatteries. Printed circuit eliminates wiringbreakdowns. Output, 500 mW. Takes 3"recording tape. 21/2" PM speaker. Com-plete with accessories, including dynamicmicrophone, monitor earphone, reel,tape, extension cord, leather carryingcase. $199.95. Sampson Co., 2244 S.Western Ave., Chicago 8, III.. . . for more details, circle 413 on page 50

Seco TUBE TESTERSModel 350 tpbe tester has sockets for

the newest tubes. The panel includes 86sockets wired through a selector switchand load system to extend tube typecoverage by at least four times, withover 2200 types listed. It incorporatesa VTVM type meter circuit, and thepower circuit is short-circuit proof. Nofuse required. Includes an automaticconstant voltage regulated tranformerfor 100-130 volts, 50-60 cps and has anaccessory panel including electronicbattery analyzer, fuse and lamp continu-ity check and vibrator tester. $179.50.Also, not shown, model 360, 105-125volts, 50-60 cps. Has manual line ad-justment. Does not have accessory panel.$149.50. Seco Electronics, Inc., 5015Penn Ave. South, Minneapolis 19, Minn.. . . for more details, circle 414 on page 50


Hermon Scottcould makethis new kitfor $30 less,If...

Hermon Scott faced a basic choice ... bring out his newLK-48 amplifier kit at $124.95 or make it to sell for $30 lesslike many other amplifier kits. All his engineering depart-ment had to do was make a few compromises.

The LK-48 is rated at 48 watts. By using a smaller powersupply, ordinary output transformers, and pushing theoutput tubes to their limits, the amplifier might still pro-duce 48 watts at 1000 cycles where many amplifier kitsare rated. But measured at 20 cycles, where Scott en-gineers feel power is really important, output would bedown considerably. No compromise was made. TheLK-48 actually produces 28 watts per channel at 20 cycles,and delivers full power throughout the audio range.

Many kits use a one color instruction book. Hermon Scottdecided to continue to use full color to insure factory -built performance, even at the hands of a novice.

Important Scott engineering extras like the all -aluminumchassis, DC operated preamp heaters and unique hum -null balancing could have been eliminated. Hum wouldhave been audibly higher and distortion at levels normalto many kits, but Hermon Scott felt that the kit builder wasentitled to the same performance he has come to expectfrom Scott factory -wired units.

Yes ... Hermon Scott could have made the LK-48 to sellfor $30 less... but it would have meant compromisinglife-long standards. This is something he would never do.You can choose any Scott kit with complete confidence- :he LK-48, the LK-72 30 watt complete stereo amplifier,the LK-150 130 watt stereo poweramplifier, the LC -21 pro-fessional preamplifier, she LT -110 multiplex tuner, LT -10FM tuner or the LM -35 multiplex adaptor. These superbkits have all the features and performance you've cometo expect from the world's leader in audio engineering.

1111H.H. SCOTT

H. I. SCOTT INC., Ill Powdernill Rd., Maynard, Mass. Dept. 140.03

Please rush me your new full -color brochure tellingabout Scott's full line of superb stereo kits.

Name

Address . . . . .

City......StateExport: Morhan Exporting Corp., 458 Broadway, N.Y.C.Ca lade: Atlas Radio Corp., 50 Wingold Ave., Toronto.Prices slightly higher West of Rockies.


ANOTHER SERVICE -PROVED

PRECLq() N

INSTRUMENT

MODEL 650

GRID CIRCUIT

ANALYZER

TUBE TESTER

AND

MEGOHMMETER

Tests most tubes including 10 -pin miniatures, 12 -pin Compactrons, 5- and7 -pin Nuvistors, Novars, octals, picture tubes (with optional adapter AD -65)and a wide variety of foreign and industrial types. Indicates gas currents aslow as 1 ua. Checks for intermittent shorts, gas content, grid emission,leakages (sensitivity over 100 megohms). Special megohmmeter circuitry for

measurement of condenser leakage, continuity and leakage of printed circuitry.

Complete in leatherette -covered case. See your PRECISION distributor or write

today for a complete catalog. Net only $69.95. AD -65 Adapter: Net only $5.95.This and all other PRECISION PRODUCTS are guaranteed for one full year

PRECISION APPARATUS CO.,INC.SUBSIDIARY OF PACOTRONICS, INC.III 70-3184thST.,GLENDALE, NEW YORK


REPEAT OFFER!BUY 1 TUBE AT THE REGULAR

PRICE AND GET EVERY SECONDTUBE FOR JUST lc

EACH TUBECOSTS YOUONLY 17',cEACH, ANDIN QUANTI-TIES OE 100TUBES ONLY16' zr EACH.

lc SALE ONLY ON TUBESLISTED BELOW!

For every tube you buy at 35ceach, YOU GET A SECOND TUBE FORJUST ONE PENNY!

Buy 100 tubes for 33c each andGET AN EXTRA 100 TUBES FOR JUSTSi! Take your pick . tube typesmay be mixed!

6AU6 6CG7 6W4GT6AC7 6SN7GT 12507

LOOK! 1,000 USED TV'SCostly.

famous make con-sole models with little or

no tube replacement! ite- C 695Quire only minor adjust- 4ment. Perfect for resale. or

136".yol'f- ornd siercicregl. . . none smeller! Bets

As Is

shipped FOB, Itanison. N.J.

The "Stethotracer,"a pen -size signal trac-er quickly locateshum, oscillations,ground loop, printedcircuit breaks, andother common de-fects. Detects and de-modulates any lowlevel Awatt audio ormodulated radio fre-quency signal, andthen amplifies it 1,000times in a button ear-phone. The signalmay also be observedon a scope, using anoptical plug-in scopeadaptor. It can beused as a pre -ampli-fier and is ideal fortesting and trouble-shooting radios, am-plifiers, phonographs,magnetic tape record-

ers, phono pickup cartridges, dictating machines, and hearingaids. Also ideal for running continuity tests on capacitors,transistors, and other components. Complete with earphone,cord, three interchangeable attenuator probes and r -f detector-demodular crystal diode probe, ground clip and battery. $29.95.Don Bosco Electronics, Inc., Littell Rd., Hanover, N. J.

. . . for more details, circle 415 on page 50

NEW PRODUCTS

Don Bosco SIGNAL TRACERS

1-yr. guaranteedRadio &TV Tubes

ur

Factory Used or Factory Second Tubes! TRUVACwill replace FREE any tube that becomes detective Inuse within 1 year from date of purchase!

ALL TUBES INDIVIDUALLY BOXED!CODE DATED & BRANDED "TRU-VAC '

Partial Listing Only ... Thousands More Tubes in Stock!

SPECIAL!0Y4 38N6024 3R26

A7GT 3C868307 304H5GT 3S4L4 3V4L6 4BQ7AN5GT 4139885 4132795 4C86T4 5AM8U4 SAN8U5 5AT8V2 SAWSX2 5A24

2AF4 5BRO28N4 5CG82CY5 5163A5 5843A L 5 5783AU6313C5

6AQ56,4066AC176AR561135

5U4 6AT6 6BL7GT 6CR65U8 6AUIGT 68N6 6086

Seasational Offer!"Self Service"

TUBE CHECKERS

$3795FOB OurWerehouse

Lot your customers tottheir own tubes! Thesereliable. reconditioned

.iii 'returncheckers

will return your Inost-meat in one weal orleo ith little or noOle11 en your part!Hendon, noldtrated

models COM-PLETE WITH KEYFOR BOTTOM DOORAND NEON -LIGHTEDHEAD!

$33Per

AnY tube no

d also

IZrIMES11"ilable Ott

3liste.*eac6CB6 . . . 30¢ 6CQ8 . . . 30¢

51/4G 6AU5GT 6806GT 6C97 69,47 7A4/XXL 7075V6GT 6AV7 61307 6CU5 6307 7A5 787

6CU6 6907GT 7A6 7X65Y3 6AV5GT 61398 606 63F5 7A7 7X76A6 6AV6 63Y5G 6DE6 69F7 7A8 7Y46A84 6AW8 6826 6DG6GT 69G7 7134 724

6AX4GT 61327 6DF6 69H7 7B5 2486AF4 6AX5GT 6C4 6E5 6317 7B6 2AB56AG5 6138 6CA8 6F5 63K7 787 2AD66A H4GT 6BA6 6F6 691.1 788 2AF66A146 6BC5 6CD6G 6H6 6947 7C4 211056A K5 68C8 6CF6 614 6SR7 7C5 2AT66AL5 6806 615 614 7C6 2AT76AM8 613E6 6CG8 616 678 7C7 2AU66AN8 68F5 6CH8 617 6U5 7E5 2AU7

6BG6G 6CL6 6K6GT 61111 7E6 2A966BH6 6CM6 6K7 6V6GT 7E7 2AV76816 6CM7 6N7 6W6GT 7F7 2AX4GT6BK5 6CN7 6Q7 6X4 7F8 2AX76BK7 6S4 6X507 707 2AZ7

697 6X13 7H7 2046SSGT 6Y6G 7N7 2BA6

2BA7 123117GT 3638

28E6 I2V6GT 39/44213F6 I2W6GT 412BH7 12X4 4221316 14A7/12B7 432BQ6 14E16 50,45213187 1407 501352BY7 17AX4 50052CA5 1704 50162CN5 19AUI0T 56204 I9BG6G 802F5 1916 84/6242F8 1978 117232K5 24A2K7 25Z6GT216 27207 35A52R5 3513523,47 35C52317 35W4213K7 3525

1.11A111 GUARANTIED TY PICTURE rumsThese tubes are made only tram nen parry and materials. except tor the enselope which re -used.Below Listed prices do not include dud. Add Additional 55.00 Deposit on tow sues to NY: on 21' and 24- tubes-57.50. Deposit refunded immediately when lud i$ returned prepaid Aluminized tubes -44.00 extra.Picture tubes shipped only to cominentel USA and Canada -All tubes OB. Harrison. N. 1.MIN 7.99 16KP4 1199 17HP4 16 99 20HP4 17X9 2IAWP4 17.49 21XP4 17.4912LP4 10 49 16LP4 12.19 171P4 16.99 21 AP4 2149 21E1,1 17.29 21Y1.4 11.19I 411 ,CP4 11.99 16RP4 11.99 1701,1 13.89 21ALP4 15.79 21 FPS 18.39 21114 17.49I 6AD4 16.09 17AVP4 15.49 20CP4 15.19 21A1P4 111.79 213.1P4 22.39 24AP4 1949i6D1,1 12.19 1713P4 13.49 19AP4 18.39 21AMP4 17.99 2IYP4 111.39 24CP4 27.7916GP4 16.09 17CP4 16.99 171P4 16.99 2151.14 15.79 21WP4 17.49 24DP4 29.79I6HP4 12.19 17GP4 17.59 20DP4 15.89 21AVP4 18.79QUANTITY UMW Bit Discounts Are Yours . .. Call or Write For Our 1000 Tube "Private Label" Special! AttentionBranding Dept. MGR.Memo Cheerlelly Illefendol Whisks Flee (5) Days, If Net Cernplehety fordIsfledlMU -VAC (RI PAYS YOUR POSTAGE On orders 01 55 or more in USA and Territoriee Send appffroximate poocamorderCanadian and foreign orders Ani ins, I Sun In re.inire, 2,, h.,rdl Lhar Se nd 2 on C 0. D's.

- TruVer

TRU-VAC

a.

Dept. ET2

Harrison Avenue Box 107 Harrison. N. J. HUmboldt 4-9770

58

for more details, circle 57 on page 50


Aso

nmivAt

ONEWOOFER

LIKE THIS

Only Jensen, in the new 3-P systems, has awoofer like this. It has a rigid, circular, POLYTEC*plane piston . . . an ideal acoustic radiator.It is so shallow it can go in a cabinet a mere 3%"thin, yet has full-scale, long -travel,big -woofer performance.

One thing you won't find in 3-P systems is"bass -boom". The low end is so clean, so highlydamped that exaggeration of sounds is impossible. . . every note, down to the extreme bottom,is reproduced with rare accuracy.

3-P Systems are for discriminatinglisteners. Six styles to choose from,priced at $119.50 to $159.50.Write for Catalog 165-G. --f M.

LOUDSPEAKERS

Improved transi-ent responsemeans new, clear,clean sound with-out hangover.

ensen MANUFACTURING COMPANYDivision of THE MUTER COMPANY

Jensen Manufacturing Co., 6601 S. Laramie Ave., Chicago 3E, Ill./Canada: Radio Speakers of Canada, Ltd., Toronto/Mexico: Universal De Mexico, S.A., Mexico D.F.- for more details, circle 32 on page 50

MARCH 1962 59

YOU WON'TFIND THIS

FILTER

RUMBLE ANTI -FEEDBACK

NORMAL \ SCRATCH/

CONTROL

ON ANY

OTHER P.A.

AMPLIFIER

IN THISPRICE

CLASS

What's different? The anti -feedback position-which equalizes frequencies most sensitive togeneration of feedback "howl" without reduc-ing articulation. This increases sound outputunder difficult acoustical conditions by atleast 100%. And there's plenty more thatmakes the new Harman-Kardon COMMANDERSeries of public address amplifiers different.Features usually reserved for much costlierequipment are included: 25 & 70 volt and re-corder outputs, fader/mixer and master vol-ume controls, magnetic cartridge input, lock-ing covers, etc. Find out why sound men nowuse the COMMANDER Series for all their needs.Write for detailed catalog. Commerical SoundDivision, Harman-Kardon, Plainview, L.I., N.Y.

Send free detailed catalogs: Desk 3G

Name

Address

City State

harman kardon- - - for more details, circle 27 on page 50

60

AL.JEI......AfSI OF THE INDUSTRY

Alpha Wire-MARTIN L. ROTH re-signs as sales manager.

Harry P. Bridge Co.-HARRY P.BRIDGE, JR., chairman of the board, diedsuddenly.

Progress Webster Electronics-elec-tions: MAURICE M. ROSEN as president,succeeding STUART CAINE, resigning;PAUL GOLDSTEIN, as a director and vicepresident of Frank Industries Div.;RALPH MEHR as vice president of Ches-ter, Pa. division.

Rosen Connor

Sylvania-H o m e and CommercialElectronics Div., formed to replaceHome Electronics Corp., Batavia, N. Y.with GEORGE C. CONNOR, senior vicepresident, as general manager and chair-man of the Board and PETER J. GRANTas president. WILLIAM J. PETERSON hasassumed the additional responsibility ofsales service, Receiving Tubes, NewYork, N. Y. Also negotiations have beencompleted for the sale of the firm's in-terest in the Golden Shield Corp., GreatNeck. N. Y.

Electric Soldering lion-WILLIAM W.PURTELL, JR. joins staff as vice president_

Amperes-Semiconductors & Tubesappointments: LARRY MAY as productspecialist and MARTIN WOLPERT as com-mercial engineer.

Westinghouse, Electronic Tube Div.-B. W. SAUTER, general manager, predicts10% sales growth increase for 1962.

Volkswagen - appointed H. JRITSCHER as vice president of Adminis-trative Div.

Sprague Products-second edition of36 -page manual entitled, Electrolytic Ca-pacitor Replacement, may be orderedfor 10c mailing cost.

Pilot Radio-LUTHER MARTIN SAND -WICK, vice president, will become staffdirector of Consumer Products Div. ofElectronic Industries Association onJanuary 15th.

J F D Electronics-donation given toNew York City Cancer Committee byALBERT FINKEL, president, on behalf ofemployees and customers.

For information, write Department MC 522- - - for more details, circle 36 on page 50

Duotone needles, of course . .. tipped withgenuine diamonds, sapphires or osmium.Most people forget to change their stylior don't know how to change them. Whynot suggest a Duotone diamond needlereplacement for every phonograph thatcomes into your shop? It's the stylus withthe whole diamond tip that's handset andhand polished. Your customers will ap-preciate the service and you'll appreciatethe increase in business.

Write for Free 1962 DuotoneNeedle Wall Chart and seeDUOTONE Distributor.

r

A.NONIOMVACOMPANY TiNrc KEYPORT, N. J.- - - for more details, circle 20 on page 50


Jersey Specialty-promotes AL GOLD -

STEIN from national sales manager tovice president in charge of sales.

Lescarboura Advertising-A u s T I NLESCARBOURA, pioneer electronic writerand advertising leader, died recently.

Motorola-announces plans for hugeconsumer products advertising programon both national and local level, de-signed to create new highs in sales action.

Muntz TV-elects SAMUEL W. COE toboard of directors.

Brand Name Surveys-Conductingninth year of manufacturer's question-naire survey for 25,000 servicemen'spreferences in replacement components.

Jerrold - DAN O'CONNELL namedsales manager of Taco's Consumer Prod-ucts Div.

Laugh . . .

a little!

"Hi! Did you find the buzz that soundedlike a swarm of bees?"

'The clouded effect calls for raretreatment - a soft cloth, warmsoap . . ."

and specialwater and

Executone-termination of long stand-ing patent litigation on intercommunica-tion circuitry jointly announced withDuKane, new licensing plan has beenformulated for exchange of certain patentrights.

General Electric-stocks of replace-ment semiconductors for ElectronicComponent Div. for distributor marketnow will be maintained in warehouses inLos Angeles, Seattle, Chicago. Clifton,N. J. and Owensboro, Ky., along withfranchising wholesale parts jobbers tofacilitate distribution.

Philco-included in recent electionsfor wholly owned Ford Motors sub-sidiary, Phiko Corp., are: board chair-

man-IRVING A. DUFFY and CHARLESE. BECK as president and chief executiveofficer. Vice presidents are: HENRY F.ARGENTO for government product plan-ning & marketing; HENRY E. BOWES-Consumer Products Div.; ROBERT F.HERR-TechRep. Div.; HENRY R. NOLTEas secretary and general attorney; DAVIDB. SMITH-engineering & research. MARC.J. PARSONS is director of public relations,replacing LARRY F. HARDY, retiring. Con-sumer Products Div. appointments in-clude: KENNETH COOPER-general salesmanager; J. A. WINFIELD-special mar-kets manager and G. B. KENNEDY asmarketing manager. A '62 national ad-vertising program will be launched forconsumer electronic and appliance prod-ucts.

Now! A new, all -in -one,Multiplex Generator with

built-in FM signal generator -m

1

NOMPLIO 6100104 11011

60111.

RJR41$ II 01.1

4$1, ." ' IA, Poo

IHI III1H1111Lin PIN0.01$0 (001110Mii$

CIA

UP MP

and it's by Fisher!Only Fisher Could Have Designed the New Model 300 Portable Multiplex Generator

-because only Fisher has the engineering depth in FM Stereo tuners and receivers

to create the ideal test equipment for servicing them. The future of high-fidelityradio unquestionably belongs to FM Stereo Multiplex and the Model 300 is the

instrument for the service technician in search of new business. It is compact,

fully portable and completely self-contained. It has its own built-in FMsignal generator. In addition to a com-

posite MPX signal, it also generates

low -distortion, stable audio signals.Thus it requires no companion instru-ment for full alignment of Multiplexequipment. Best of all.

Iit costs only $495.00. r S

Save $100! Act nowilIf-and only if-you mail this coupon immedi-ately, you will receive a $100.00 credit certifi-cate toward the purchase of a Fisher Model300. This is strictly a pre -production offer-pay only $395- so act now!Fisher Radio Corporation21.24 44th Drive, Long Island City 1, N. Y.

Please send Multiplex Generator CreditCertificate.NameAddress

,City Zone. State_J


MARCH 1962 61

A.C. Household EleetrIsIVAnywhere . . le yearown ear. beat sr planeOperates Standard A.C. Record Players Dictating MachinesSmall RadiosElectric Shavers Heating Pads, etc.

PLUG-IN TYPEPORTABLE

INVERTERS'MODELS6.RMF (6 volts) 60 to 80lbs.Dwatts.

EALERShippi

NETng weight 12

PRICE $33.0012T-RME (12 volts) 90 to125 watts. Shipping weight12 lbs. DEALER NETPRICE $33.00'Additional Models Available

"A" Battery

ELIMINATORFor Demonstrating and

Testing Auto Radios-TRANSISTOR or VIBRATOR

OPERATED!Designed for tasting D.C.Electrical Apparatus on Reg.ular A.C. Lines-Equippedwith Full -Wave Dry Disc.Type Rectifier, assuringnoiseless. interference.treeoperation and extreme longlife and reliability.

MAY ALSO BE USED AS A BATTERY CHARGERMODEL 610C-ELIF ... 6 vplts at 10 amps. or 12 voltsat 6 amps. Shipping weight 22 lbs.

DEALER NET PRICE 149.95MODEL 620C-ELIT ... 6 volts at 20 amps. or 12 volts at10 amps. Shipping weight 33 lbs.

DEALER NET PRICE . . $66.95

AUTO -RADIO

VIBRATORSBy every test ATR Auto -Radio Vibrators are best!

. and feature CeramicStack Spacers, Instant Start.ing, Large Oversized TungstenContacts, Perforated Reed.plus Highest Precision Construction and Workmanship andQuiet Operation!

There Is an ATR VIBRATOR forevery make of earl

Ask your distributor for ATR's Low Priced type 1400,6 volt 4 -prong Vibrator; and 1843. 12 volt 3 -prong; or1840, 12 volt 4 -prong Vibrator. THE WORLD'S FINEST!

T- here is trim platekit for YOUR CAR! CUSTOMIZED

KARADIOVibrator -Operatedwith Tone Control

ATR KARADIO ... isideal for small importcars Or compactAmerican cars! Unit

is completely self-contained-extremely compact! Pow.*Hui 8 -tube performance provides remarkable freedomLoin engine, static, and road noises. The ATRCustomized Karedio comes complete with speaker andready to install. Can be mounted in -dash or under -dash...wherever space permits! No polarity problem. NeutralDray -Tan, baked enamel finish. Overall size, 7' deep.4' high, and 6W wide. Shipping weight, radio set, 7 lbs.Model K-1279-12 for 12V Dealer Net Price. . $33.57Model K-1279- 6 for 6V Dealer Net Price . $33.57

Airplane Style OverheadMounting under Cab Root

TRUCK

KARADIOExcellent Tone.volume. and Sensitivity!Compact, yet powerful. Fitsall trucks, station wagons,most cars and boats. Just drill % inch hole in roof andsuspend the one-piece unit (aerial, chassis and speaker)in minutes. Watertight mounting assembly holds antenna upright. Yoke -type bracket lets you tilt radio toany angle.

Extra -sensitive radio has 6 tubes (2 double -purpose).over -size Alnico 5 PM speaker for full, rich tone. Big.easy -to -read illuminated dial. Fingertip tuning control.Volume and tone controls. 33.in. stainless steel antenna.Neutral gray -tan enameled metal cabinet, 7 x 6% x 4 in.high over-all. Shipping weight 10% lbs.Modal TR-1279-12A for 12V Dealer Net Price 141.96Model TR-1279- 6A for 6V Dealer Net Pr.ce $41.96

NO PMHTEDCIRCUITRY

ISEE YOUR ELECTRONIC PARTS DISTRIBUTORWRI1E FACTORY FOR FREE LITERATURE...

ATR ELECTRONICS, INC.Jonolfly Pt "ohm I, 'OM e 1031

PAUL I, MINNESOTA- U.S A

- - - for more details, circle I I on page 50

CATALOGS

AND BULLETINS

TOOLS: Covered in illustrated bulletin1621 is a specially designed terminalwrench for removing spanner nuts onexternal antenna and ear phone jacksof imported transistor radios. Xcelite,Inc., Orchard Park, N. Y.. . . for more details, circle 312 on page 50

STEREO CARTRIDGES: Literature cov-ers compact snap -in stereo cartridges,catalog designation "S" and "T" designedas replacements for all crystal stereocartridges. The new snap -in cartridgecomplete with two needles makes it eas-ier to change the entire cartridge ratherthan the needle alone. Jensen Industries,Forest Park, Ill.. . . for more details, circle 313 on page 50

TUBES: Interchangeability guide (ETR-2773 ) lists standard prototypes which canbe replaced with "Five Star" high relia-bility tubes. Features, specifications andtypical applications included. ReceivingTube Dept., General Electric Co., Ow-ensboro, Ky.. . . for more details, circle 314 on page 50

CB TRANSMITTERS: Six -page, 2 -color,brochure contains description and com-plete specifications for model 23/S -NINE citizens band transmitter. Brown-ing Labs., 100 Union Ave., Laconia,N. H.. . . for more details, circle 315 on page SO

AMMETERS: Eight -page, illustrated,bulletin covers complete line of im-proved Tong Test AC -DC snap -aroundammeters. Tong Test is reported as theonly ammeter of its type that measuresboth a -c and d -c. Columbia Electric Mfg.Co., 4511 Hamilton Ave., Cleveland 14,Ohio.. . . for more details, circle 316 on page 50

STEREO -HI-FI: Literature covers anAM hi-fi stereo console which can bepromoted under $80. Has six tubes, fourspeakers and automatic changer. Also,at same price, an AM/FM, FM stereotable radio with 13 tubes and four speak-ers. Both units made by the Victor Co.of Japan. Delmonico International Div.,Thompson -Starrett Co., 120-20 Roose-velt Ave., Corona, N. Y.


T APE RECORDERS: Swedish -madeLuxor Magnefon MP -410-A stereo taperecorder is covered in literature. May beused to record and play back in twotrack stereo or four track mono fromphonograph, microphone, radio, etc.AmeLux Electronics Corp., 60 E. 42ndSt., New York 17, N. Y.. . . for more details, circle 318 on page 50

Utah'sfamous micro -gap

replacementSPEAKERS

Better response - better soundreproduction than original equip-ment! Better customer response,too, when you install Utah Micro -Gap replacement speakers. Sin-gle -packed in custom -fitted car-tons. Illustrated above:

A SP69NF 6x9" Oval InvertedAuto SpeakerliSP12.112" RoundSpeaker IM SP4A 4" Square Out-door Speaker IS SP69G 6x9" OvalAuto Speaker M SP8NF 71/2" In-verted Pin Cushion Speaker.

Write for illustrated literature=1,FEEL TRONICS CORP

HUNTINGTON. INDIANA- - - for more details. circle 59 on page 50

ELECTRONIC TECHNICIAN62

AUDIONEWS LETTER

PENTRON reports resignation of Irving Rossman, president.

ROBINS offers felt replacement pressure pads for tape re-corders. A package of 40 pads (cat. #PP -1) lists at $1.00.

JERROLD acquires Pilot Radio Corp. on all -cash transaction.Pilot will continue to operate as an autonomous company.

JENSEN INDUSTRIES supplies "reminder cards" to itsdealers to help them nudge their customers into replacingworn-out needles.

ALLIED is marketing a new, compact stereo FM adapter kit,model KS -I0. Says it can be used with any FM or AM -FM tuner equipped with a multiplex output. $19.95.

LOS ANGELES MUSIC SHOW drawing for rooms resultedin largest assignment in the history of this industry's shows.Fifty-four rooms were drawn, with eighteen remainingavailable at last count.

BOGEN-PRESTO appoints Heaton -Marco Associates, SanFrancisco, as factory sales rep for all Bogen products innorthern Calif. and northern Nev. Also acquires "Page -master" from Stromberg-Carlson.

SWITCHCRAFrs new molded cable assembly, Part # 10FK25,interconnects a stereo mixer to stereo or mono recorderswithout soldering, wiring or using tools. Designed forstereo recorders with 3 -conductor dual inputs. $4.00.

BELL SOUND reports resignation of Andrew Lorant, ad-vertising, sales promotion and public relations manager,effective Jan. 15. Distribution pattern being realigned.Program underway in effort to put the company back ona one-step basis in most markets and combined one-stepand two-step distribution basis in key areas for audiocomponents.

NEXT BEST THING TO THEWINEGARD ELECTRONICPOWERTRON

TV ANTENNA

NEW TRANSISTOR TV -FM

WINEGARDTENNA_

INSTALL IT... FORGETALL ELECTRIC, ALL -AC POWERSUPPLY costs less than 27c ayear to operate. Many exclusivefeatures.No costly, nui-sance batteries!

Built-in two setcoupler.

ssAC audit onpower supply.

MOUNTS ONANTENNA

19 DB GAIN! CUTS SNOW...BOOSTS SIGNAL!Now you can make any TV or FMantenna work better by magnifyingsignals with the new Winegard tran-sistor Tenna-Boost.

Tenna-Boost has up to 19 DBgain, no peaks and valleys. Ultra lownoise. Linear frequency response.VSWR input better than 1.5:1across all frequencies. OutputVSWR 1.8:1 or better. This finefrequency response plus the verylow VSWR make Tenna-Boost ex-cellent for color.

Winegard's exclusive input band-pass filter eliminates interferencefrom citizen's band, Hams, garagedoor openers, etc. Only TV and FMsignals are amplified.

All metal parts are anodized, irri-dized or stainless steel. Completelyweather-proof, trouble -free. Installit .. forget it.

There's a big difference in antennaamplifiers! Ask your distributor orwrite for technical bulletin.

FOR THE ULTIMATE INTV RECEPTION

Winegard Transistorized ElectronicPowertron TV Antennas. 3 Modelsto Choose From.

ANTENN YSTEMS _3019-38 Kirkwood Burlington, Iowa

- - for more details, circle 62 on page SO

RFOR "DOCTORS OFSERVICING"

AULEri,--,A114g, ICA TES

7-F -TS

THE PROFESSIONALSERVICE MAN'S

CLEANER

cleans contactsCLEANER!

Want total cleaning power that helps you do abetter servicing operation 3 ways? Spray elec-trical contacts and switches with triple actionContact Shield. Cleans, lubricates, and safe-guards, like no other cleaner can! Gives lastingprotection in seconds . . . thanks to Siliconebase. Independent laboratory tests prove it!Technicians approve it! Write for handy guide-book to more efficient servicing . . . ChannelMaster Corp., Ellenville, N.Y.

C 1962 CMC


S011iVP

MS TOEXTRA

PROFITS

Get into the all -year-round commercial sound trade and doaway with seasonal repair work slumps! This steady -profitbusiness - sales, installation and service - is available rightin your own neighborhood! Factories, restaurants, schools,offices, bowling alleys ... outdoors, athletic fields, swimmingpools, etc.... all are prospects for you.

Atlas Sound products, built to quality standards and backed byover 25 years of "know-how", are insurance for your reputation.Your Atlas Distributor can supply you with a complete line ofperformance -proven job -rated equipment: speakers, mike standsand related accessories for a professional sound installation.

Write for latest catalog and names of Atlas Distributors.

ATLAS SOUND DIVISIONAmerican Trading and Production Corporation1419-51 39th Street, Brooklyn 18, New YorkIn Canada: Atlas Radio Corporation, Toronto

- - - for more details, circle ID on page 50

ASSOCIATION....i...I NEWS

CaliforniaSlogan Wanted

CSEA, Sacramento, has asked mem-bers to suggest a slogan that is uniqueand will identify the service industry.It should be equivalent, for the serviceindustry, to the florists' "Say it withFlowers," or the plasterers' "Knock onthe Wall."

TSDA, San Francisco, is conducting asurvey of its members to determine loss-es from theft and shoplifting at the TVdealer level. Study results will comebefore law enforcement agencies.

New YorkTV Tube Labelling Law

ESFET, Kenmore, president DouglasCook, of the Empire State Federation ofElectronic Technicians Associations,says very few of the state residents areeven aware of the TV tube labelling lawwhich went into effect over a year ago."This fact has been brought out clearly,"said Mr. Cook, "by a recent survey ofN. Y. TV technicians who said that fewor none of their customers knew thelaw existed." The 1960 law requiresall TV replacement tubes to be labelledas to their true condition-"new" or"used-on both the tube and the cartonthe tube comes in. It further requiresthe technician replacing the tube to givea written statement to the customer aboutwhether the tube is new or used.

OhioARTSD, Columbus, elects: Pres., Jack

Voiget; V.P., Frank Shannon; Record-ing Sec'y, Walter Driscoll; Correspond-ing Sec'y, Rex Rice; Treas., Paul Boyer.Board of Directors: Lou Benhard,George Dykes, Bill Hetrick, Bob Kapp,elected to serve as the Jobber Repre-sentative. NATESA Director, JohnGraham. TESA Ohio Director, HermanFrancis.

PennsylvaniaTSA of D. V., Philadelphia. Allen

Roberts reports a recent meeting heldat Motorola's request with TSA presi-dent, Herman Shore, on handling carryin service on Motorola portable andtable model TV sets, now carrying oneyear parts warranty. After lengthy dis-cussion on rates, Pres. Shore requesteda meeting with executive sales and man-agement but service would not agree tothe meeting. Rates originally discussedwere fairly realistic and competitive. Thediscussions continued and after numerousphone conversations, which were all thatcould be arranged at the time, the ratestructure was suddenly decreased to aridiculously low figure. Pres. Shorewould not negotiate at these figures andagain insisted on meeting with the topmanagement. This meeting could neverbe arranged . . . and at this point nego-tiations were ended.


. . . Electronic DevicesContinued from page 29

current. CR-1 prevents oscillationfrom occurring across L-1. When0-1 is "turned -on" by a detectorpulse, it saturates and nearly all ofthe battery voltage of BT -3 andBT -4 appears across winding 3-4of T -l. The current in this wind-ing increases and a voltage is in-duced in winding 1-2. This inducedvoltage is in a direction such thatconduction of Q-2 is maintained.Winding 3-4 current increases line-arly until the transformer core sat-urates. At this time the circuit rap-idly "turns -off" and an inductive"fly -back" appears across bothwindings.

A rectangular voltage pulse ofabout 110 microseconds durationappears across winding 3-4 of T-1for each detector pulse. This shapedpulse charges the integrating ca-pacitors C-2 and C-6 by rectifierCR-2 with an amount of chargedetermined by the range resistorR-1, R-2, or R-3 and R-4. Thecharge placed on these capacitorsis discharged through the meterM-1 and its series resistor R-5. Themeter current then is dependent onthe charge per pulse and the pulserepetition rate. Resistors R-6 andR -7A are used to adjust calibra-tion. Three ranges are provided:The first or X-100 requires 80,000pulses per minute for full scale in-dicators; the second or X-10, 8,000pulses per minute; and the thirdor X-1, 800 pulses per minute. Theresponse time constant of the in-strument is fixed essentially by thevalues of C-2, C-6, R-5 and themeter resistance. It is nominally 8seconds for 63% response or 24seconds (3 time constants) for 95%response. Response time can bereduced by removing one of the ca-pacitors C-2 or C-6, or can be in-creased by adding additional ca-pacity.

The voltage pulse for the head-phones is taken from fly -back wind-ing 3-4 by diode CR-3. C-3 is anintegrating capacitor to "stretch"the "fly -back" pulse. R-8 is an iso-lating resistor and CR-4 damps

IF YOU CHANGEYOUR ADDRESS

Notify us at 1 East First Street, Duluth 2,Minn. Please include the address labelfrom a recent issue and allow 30 daysfor the change.

4 STEPSTO BIG MONEYIN MASTER TVINSTALLATION

WITHBLONDER -TONGUE

Thousatols of service technicians are no.% reaping a financial har-vest in Master TV system installations. Motels, schools, apartmenthouses, trailer camps and hospitals are just a few of the growingmarkets for Master TV systems. If you're a TV service technicianwith just a little extra initiative, it's easy to get started in MasterTV. Here's how:

1. Start with the Blonder -Tongue 'Planning and Installation'Manual. It will give you a practical working knowledge of MasterTV systems. Further, the 'packaged systems' shown will enableyou to handle most Master TV jobs. NV lite for free manual.

2. Next, use Blonder -Tongue's free system layout service. It putsyou in a position to specify the right products for a system andmake a competitive bid.

3. For real big systems, on -the -spot ergineering is available at anominal cost.

4. Finally, draw upon the world's only matched and integratededucational TV, closed circuit TV and com-

munity TV equipment.

There's a Blonder -Tongue product for every possible application.Each is designed to do a specific job - yet each is matched tobring out the best in the others. And, Blonder -Tongue quality, aresult of its vast experience, protects }ou against expensive call-backs. Blonder -Tongue does not compete with its customers.

Don't hesitate. Get started today. For full details on how to becomea 3londer-Tongue installer, write:

engineered and manufactured by

BLONDER TONGUE9 siting St., Newark, N. J.

Canadian Div.: Benco Television Assoc., TorontoExport: Rocke Intl. Corp.. N. Y. 16. N. Y.-CABLES: ARLAII

MARCH 1962

for more details, circle 14 on page 50

65

For your custom stereo installations

Three of the world's finest components on one chassis1 AM -FM -Stereo Multiplex Tuner: sepa-

rate tuning indicators for FM and AM;exclusive Fisher STEREO BEAM automati-cally shows whether an FM station is broad-casting in stereo.

2 High -Power Stereo Amplifier: 65 wattsmusic power; special center -channel

output connection for third speaker.

3 Master Audio Control -Preamplifier:complete, easy - to -use control system

assures total flexibility; provisions for everytype of input. Price $429.50*

*Walnut or Mahogany cabinet 1124.95;prices slightly higher in the Far West

a.

USE THIS COUPON FOR DETAILED INFORMATION

Fisher Radio Corporation21-14 44ds Drive, Loos Island City 1, N. Y.

Please rush the following FREE literature: Complete specifications on the Fisher 800-B

Receiver.El The 1962 Fisher Handbook, a 40 -page illus-

trated reference guide and component cata-logue for custom stereo installations.

Name

Addre..

City 7.nne_State


IRE/SHOWpresenting

"THE GOLDENAGE OF

ELECTRONICS 77

March 26-29, 1962The New York Coliseum

. . . part of theInternational Convention of the IRE

The Institute of Radio Engineers1 East 79th Street New York 21

Members $1.00. Non-members $3.00. Age limit: over 18- for more details, circle 30 on page 50

"ringing" of the headphones. Apulse between 5 and 10 volts insize with an approximate durationof 60 tis at mid -value is availableacross a 3000 ohm resistive loadconnected to J-1. This pulse pro-vides a headphone click.

Calibration and ServicingThe aforementioned unit can be

calibrated in counts per minute byapplying a pulse generator outputto the unit's input and adjustingthe CAL adjusting potentiometer.A pulse generator producing nega-tive pulses at least 0.5 volts in am-plitude, approximately 5µs in dur-ation, and a repetition rate of ap-proximately 6000 pulses per min-ute is required. Calibration is ac-complished in the following man-ner:

1. Remove the case bottomfrom the instrument.

2. Connect the pulse generatoroutput, in series with a 500 pf 1200volt capacitor, to the input con-nector on the case top.

3. Turn the switch to the X-10range and adjust the CAL potentio-meter until the meter scale is iden-tical with the pulse repetition rateof the pulse generator.

The instrument will then be cali-brated in all its ranges. The in-strument will be about 15% toosensitive on uniformly spacedpulses near full scale on the X-100range. This added sensitivity on theX-100 range is deliberately built-into compensate for the dead -timeof the Geiger tube and instrumentelectronics on randomly spacedpulses of high repetition rate. Dead-time correction is not required onthe X-10 or X-1 range.

Servicing: When the power sup-ply is operating, a buzz of about100 cps in frequency can be hearddue to the oscillations of the powertransformer laminations. If thisbuzz is not audible, the oscillatorsection is probably not operatingand the setting of R -7B should bechecked. This screwdriver adjust-ment is set properly by the follow-ing procedure:

1. Insert a 0-100 ma meter inseries with the power supply bat-teries, BT -1 and BT -2.

2. Turn the "HV" adjustmentfully counter -clockwise.

3. Turn the instrument "ON".4. Advance the screwdriver ad-

justment clockwise until the meter


reads 33 ma with new batteries.The high voltage output of the

power supply should be tested withan electrostatic voltmeter. The volt-age should read 900 volts with thehigh voltage selector switch in the"GM" position and 1200 volts inthe "SCINT" position. This volt-age may also be measured with a20,000 ohms -per -volt voltmeter onthe 5000 volt range with new bat-teries in the instrument.

The nominal resistance values forthe transformer (T2) windings are:

Winding 1-2, 4,500 ohms.Winding 3, 4, 11 ohms.Winding 5-6, 5 ohms.To check operation, after indi-

cated continuity tests have beenmade, the integrating circuit may betested further with an oscilloscope.The proper pulse wave shape onthe collector of Q-1 is a positive3 volt square wave of a nominal110 psec in duration followed bya "fly -back" of about -20 voltsin amplitude. If the wave shape atthe anode of CR-1 shows "ring-ing," CR-1 is probably defective.Diodes CR-1 through CR-4 maybe tested with an ohmmeter on theR x 10,000 range. One end of thediode under test should be discon-nected from the circuit for this test.The indication of a good diode is avery low resistance with the ohm-meter leads connected one way.With the leads reversed, the resis-tance reading should be 100,000or greater for CR-1, CR-3, andCR-4. CR-2 should be 1 megohmor greater. Diode CR-5 in the highvoltage power supply will not re-spond to this test.

. . . Transformer ProblemsContinued from page 32

sirable to obtain an exact fittingcomponent. If a universal replace-ment type is used, new mountingholes may sometimes be required.

A number of precautions are nec-essary when replacing i-f trans-formers. Because of the relativelyhigh frequency, all wire leads tothe transformer should be dressedas originally prevailed, and theseconnections should be the exactsame length.

If a load resistor is used acrossa transformer winding, it should bechecked to determine if the resis-tance value is correct. When re-moving or changing a resistor, itsposition and soldered lead lengths

i

L

GUARANTEEEach Seco Model 88 is Lnconditionally

guaran-

teed to be up-to-date for the testing of receiving

type tubes. Adaptor kits or set-up data will be

furnished without cost to keep your tester cur-

rent for one year from date of purchase.

05E1 1962

New Seco Model 88 Tube Tester is guaranteed againstobsolescence. Gives you patented Seco GRID CIRCUIT,also CATHODE EMISSION tests-tests over 2,200 tubetypes including Nuvistors, Novara, Compactrons, new 10 -pin types and battery types. You also get:

A check for troublesome gridemission and all common leak-age and short faults in oneoperation. READ ON METER.

A cathode emission test in spe-cial low impedance circuit.

A burnout -proof meter employ-ing a VTVM amplifying circuit.

Few controls-simple operation-compact, lightweight size.

Convenient fast -find setup in-formation in cover.

A check for filament continuityand open elements.

For full information write or send coupon below to Seco,originator of the famous Grid Circuit Test.

SECO ELECTRONICS, INC.-Nr.,/ 5021 Penn Ave. So., Minneapolis 19, Minn.

Please send free Model 88 information "How to Test Tubes"

NAME

ADDRESS

CITY STATE


MARCH 1962 67

COLOR CODED

NUTORIVER SETS

no fumbling...

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-411111

17HANDY

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7 Most -used sizes -36" thru Ye"

High carbon steel, polished and plated

Precision fit case-hardened sockets

Shockproof plastic handles (UL)

Large, readable size indexes

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OTHER SETS, TOO: hollow -shaft or mixed

PLUS A FULL RANGE OF SEPARATE NUTDRIVERS:3/32" thru 3/4" - Regular, Stubby, Extra -long,Midget (Pocket clip)available through leading electronic distributors

XCELITE, INC.-ORCHARD PARK, N. Y.Canada: Charles W. Pointon, Ltd., Toronto, Ont.

HAND TOOLSQuality screwdrivers, nutdrivers, pliers,

wrenches, service kits, and special purpose tools.


should be similar to the originalconfiguration.

It is sometimes necessary to re-align the entire i-f section afterchanging a transformer if any dif-ficulties, such as smearing, trailingwhites, lack of definition or poorvertical or horizontal sync prevail.

Vertical Sweep Transformers

Two different vertical transform-ers may be employed in some ofthe modern TV sets made today.A transformer is used in all ver-tical blocking or feed -back oscilla-tors, and another is used in thevertical amplifier's output. T h eblocking oscillator transformer cou-ples the oscillator tube's plate andgrid circuits, and the vertical out-put transformer couples sawtoothpower from the vertical output tubeto the vertical windings in the de-flection yoke.

Vertical output transformersusually fail more often than block-ing oscillator transformers, perhapsbecause of the higher currents pass-ing through them. Defects in ei-ther may be indicated in a numberof ways - usually by a completecollapse of vertical sweep, a fewinches of vertical sweep, or insuf-ficient sweep, top or bottom.

Although technicians use a widevariety of troubleshooting ap-proaches when a defective verticaltransformer is suspected, the gen-eral approach calls for signal sub-stitution. This is true - whether amodern signal -substitution instru-ment is used, a signal is obtainedfrom another operating TV set, oran inexpensive make -shift methodis employed to obtain a substitutesignal from the ailing TV set'sheater windings.

As shown in Fig. 4, a sweeptroubleshooter is used to quicklydetermine if a vertical output trans-former is at fault. A vertical saw-tooth signal generated by the in-strument is fed to the vertical out-put tube's plate. If the rasterspreads substantially in a verticaldirection, the amount of spread de-pending upon the signal input am-plitude, it can generally be as-sumed that the vertical outputtransformer is good. If no percepti-ble increase in vertical sweep, theoutput transformer or the deflec-tion yoke can be at fault.

If an increase in sweep is ob-tained with a signal at the verticaloutput tube's plate, then the d -c

TV TIPSFROM TRIAD

NO. 16 IN A SERIES

"Where's Joe?" asked parts salesmanAl.

"Reading up on electrolytics, I sup-pose;' smiled Bill, the Senior PTM.

"How's that?"

"Well, Joe got this 19 -inch portablejob that was keystoning. Right away,he says to himself it's got to be theyoke. But it wasn't, and he fooledwith that thing for the longest time.He'd still be at it if I hadn't pointedout that a lot of new 19- and 23-inchers use the B+ boost voltage forthe vertical output stage rather thanthe B+ source'

"Has to do with giving you enoughvertical scan on the big CRT's,doesn't it?" said Al.

"Right. In a lashup like that, they'vegot a filtering capacitor, usually anelectrolytic, to take care of the hori-zontal spike coming from the B+boost voltage source. When this ca-pacitor opens the filtering actiondrops. This causes the spike to showup at the plate of the vertical outputstage and in the vertical yoke coils.The rest is simple. You lose some inthe vertical and horizontal sweepsand it's just like a keystone from aflubbed out yoke'

"Hmm:' said Al slyly, "I guess Joewill make a better Keystone cop fromnow on!'

MORAL: Don't knock the TriadY-66-1 until you've checked out thefiltering capacitor. In the meantime,get on Triad's permanent mailing listand receive the new catalog TV -62 aswell as other helpful literature.Write Triad Distributor Division, 305

No. Briant St., Huntington, Indiana.

A DIVISION OF LITTON INDUSTRIES LEI. - for more details, circle 55 on page 50


voltage at the blocking oscillator'splate should be checked with thevolt meter. If this conforms closelywith the manufacturer's specifica-tion, then check the voltage at theoscillator's grid. The voltage hereshould be as specified, and mayvary from -15 to -30, dependingupon the particular oscillator de-sign and the hold control setting.If this voltage appears positive orhas a lower -than -normal negativevoltage, the blocking oscillatortransformer may be leaking. Ifthere is no voltage indicated andthe grid reads zero, the transformerwinding can be open. Of course, apossible fault in C-1, R-1 or R-2should be considered.

Blocking oscillator transformerreplacements are not too critical,except that one with the exact turnsratio should be obtained. If thephysical size or shape is different,it may be necessary to drill oneadditional mounting hole in thechassis. Vertical output transform-ers are sometimes critical. An exactreplacement should be provided.Most replacement parts manufac-turers list exact replacements formost sets in their catalogs, givingessential electrical and physicaldata. Lead dressing around thesetransformers should also not be dis-turbed. Both transformers can alsodevelop lamination hum or buzz.

HV TransformersKnown as the flyback, horizon-

tal output, or high voltage trans-former, this TV component sup-plies high voltage to the horizontaloutput tube's plate and to the plateof the high voltage rectifier tube.A stepped -down heater voltage forthe high voltage rectifier tube isalso obtained from the flyback. Inaddition, the transformer generates,through combined action of theyoke and the damper tube, a B+"boost" voltage. It also frequentlysupplies a medium high voltagep -to -p pulse for keyed agc circuits,or to afc circuits for controlling thehorizontal oscillator.

Fault symptoms caused by theflyback can be complete loss ofraster, insufficient brightness, a"blooming" raster (raster expandswhen brightness control is ad-vanced), streaks in the raster (in-ternal arcing in transformer), lossof boost voltage, agc or afc pulses.

Here again, the best approachto suspected flyback problems is

MARCH 1962

new

Sonotone

Cartridge6-Paks

I make iteasy to

STOCK I

SAVE

SERVICE

SELL

STOCK-Hang it on the wall, stand it on a shelf, slip it intoyour caddy. Cartridge model number is always visible forquick identification.SAVE-Save money on purchase of any 6 SONOTONE car-tridges-save time by always having the right replacements.SERVICE-You always have the right replacement to servicevirtually every record player on the market.SELL-In your shop, an eye -compelling display (unique bon-net fits over 6 -Pak to remind your walk-in customers tomodernize their record players). In your caddy-a variety ofcartridges for nearly every replacement.Every time you buy 6 SONOTONE cartridges from your dis-tributor, they come in the new attractive 6 -Pak cartridgesleeve. You can select any 6 SONOTONE cartridges, or one ofthree pre -selected 6-Paks which include the most needed car-tridges for the most often faced replacement situations. STEREO 6-rax-covers nearly every stereo replacement orconversion. Six stereo cartridges from the audiophile's favor-ite, the 9T, to the budget -priced stereo crystal cartridge, the12T. Consists of models: 9T, 8T -A, 16T, 18T, 10T and 12T. STEREO/MONO 6-FAx-covers most stereo or mono replace-ment needs. Consists of 3 stereo ceramics models 8T -A, 9T,16T ; and 3 mono ceramics : 1P, 2T, 3T. MONOPHONIC 6-PAK-covers virtually all most called formonophonic replacements. "LB" denotes "less bracket" for slimtonearms. Consists of models; 1P, two 2T's, 2T -LB, 3T -LB.The 6 -Pak is just another way that SONOTONE simplifiesyour inventory and makes it easier to sell cartridges. Ordera SONOTONE 6 -Pak today at your parts distributor.FREE: The new SONOTONE cartridge cross-reference chart cata-log is available at your distributor, or write : Dept. ET -3SONOTONE® CORPORATION ELMSFORD, NEW YORKELECTRONIC AP.LICATIONS DIVISION In Canada: Atlas ladle Corp., Ltd. Toronto

Cartridges doeskin Tape Heeds Mikes Bectronle Tubes flatteries Hearing Aids


69

TEXASono

CITIZEN BANDCLASS "D"

CRYSTALSAll 22 Frequencies in Stock

3rd overtone. .005% tolerance-tomeet all F C C requirements. Her-metically sealedHC6/U holders. 1/4" $ 9 9 5

- .005 pins. (.093 pins iEACHadd I5c per crystal.)

perI

j

'

pin spacingavailable,

The following Class "D" Citizen Band fre-quencies in stock (frequencies listed in mega-cycles): 26.965, 26.975, 26.985, 27.005, 27.015,27,025, 27.035, 27.055, 27.065, 27.075, 27.085,27.105, 27.115, 27.125, 27.135, 27.155, 27.165,27.175, 27.185, 27.205, 27.215, 27.225.

Matched crystal sets for all CB units ....$5.90per set. Specify make and model numbers.

RADIO CONTROL CRYSTALS IN HC6/UHOLDERS

Specify frequency. W' pin spacing .. pindiameter .05 (.093 pin diameter, add 15c)- $2.95 ea.

FUNDAMENTAL FREQ. SEALEDCRYSTALS

in HC6/U holdersFrom 1400 KC to 2000 KC .005%

ToleranceFrom 2000 KC to 10,000 KC any ire- ea.

quency .005% Tolerance $3.50ea.SEALED OVERTONE CRYSTALS :

Supplied in metal HC6/U holdersPinspacing .486, diameter .050

15 to 30 MC .005 Tolerance ea.30 to 45 MC .005 Tolerance .10 ea.45 to 60 MC .005 Tolerance OOOOOO OOO I OOOOOOOO

o"---,

I

.005%

.005%

.005%

Mira

111"-AME4Taus atmMs 67., A"is. ltf) j

Cria/arPin

MADE TO1001

tolerance2601

tolerance9001

toleranceSpecify

QUARTZ CRYSTALSFOR EVERY SERVICE

All crystals made from Grade"A" imported quartz-groundand etched to exact frequen-ties. Unconditionally m uaran-teed! Supplied in:

FT -243 holders MC -7 holdersPin Spacing Pin Spacing

1/2" Pin Diam- 3/4" Pin diameter .093 eter .125

FT -171 holdenHoldersholdersSpacing 1/2" Pin Spacing

Pin Diameter 1/4" Banana.125 pins

ORDER CRYSTALSKC to 2600 KC:

$4.50 ea.KC to 9000 KC:

$2.50 ea.KC to 11,000 KC:

$3.00 ea.holder wanted

Amateur, Novice, Technician Band Crystals.01%Tolerance ...$1.50 ea. -80 meters (3701-3749 KC), 40 meters (7152-7198 KC), 15 meters

K(7034-7082 KC), 6 meters (8335-8650 C) within1 KCFT -241 Lattice Crystals in all frequencies from370 KC to 540 KC (all except 455 KC and 500KC) 50c ea.Pin spacing ys" Pin diameter .093Matched pairs * 15 cycles $2.50 per pair200 KC Crystals, $2.00 ea.; 455 KC Crystals,$1.25 ea.; 500 KC Crystals, $1.25 ea.; 100 KCFrequency Standard Crystals in HC6/1J holders$4.50 ea. Socket for FT -243 crystal 15c ea.;Dual socket for FT -243 crystals, 15c ea.;Sockets for MC -7 and FT -171 crystals 25c ea.;Ceramic socket for HC6/U crystals 20c ea.Write for new free catalog #961 complete with

oscillator circuits

ASK YOUR PARTS DEALER FOR TEXASCRYSTALS

See big red display ... if he doesn't stock them,send us his name and order from our Floridaplant.

Now! Engineering samples and small quantitiesfor prototypes now made either at Chicago or atFt. Myers Plant. 24 Hour Service.

IN CHICAGO, PHONE GLADSTONF. 3-3555

RUSH YOUR ORDER TO OUR NEW PLANTUse coupon below for 1st Class shipment.

TEXAS CRYSTALSDept. T-12. 1000 CRYSTAL DRIVE, FORT

MYERS, FLORIDAFor extra fast service, Phone WE 6-2100

I ATTACH THIS COUPON TO YOUR ORDERFOR SHIPMENT VIA 1ST CLASS MAIL AT

NO EXTRA COSTTERMS: All items subject to prior sale and

I change of price without notice. All crystal or-ders must be accompanied by check, cash or

I M.O. with PAYMENT IN FULL.Dept. T-12


signal substitution or injection (SeeELECTRONIC TECHNICIAN M a y1 96 1 ). Commercially availableequipment for making these testsare ideal. Inexpensive, simple -to -operate flyback checkers are alsoavailable. And some technicianssubstitute voltages from a good op-erating TV to the dead set in orderto isolate faults.

Flyback transformers are highlycritical, electrically and physically,and exact replacements should beobtained. All HV leads, includingrectifier filament leads, should bedressed as originally established.

Audio TransformersIn addition to the 4.5 me sound

take off, limiter grid input, andsound i-f coils and transformers,which seldom give trouble, the con-ventional f -m detector and audiooutput transformers are employed.These are usually the most trouble-some. Trouble symptoms may becomplete loss of sound, insufficientvolume, or distorted sound.

The conventional detector trans-former contains two "gimmicks"sealed inside the transformer's hous-ing (small value capacitors) which,in addition to cold and rosin solderjoints at winding lead connections,create considerable problems in 'IVsound sections. Faults should beapproached in a somewhat similarmanner as those in Video i-f trans -forme rs.

An exact replacement with simi-lar electrical and physical charac-teristics is highly desirable, al-though in a pinch a larger or small-er transformer can be made to workif electrical characteristics are simi-lar. The transformer should bealigned after replacement, employ-ing a sweep generator, marker gen-erator and scope. Manufacturersspecifications for this alignmentshould be followed closely.

Audio output transformers aredesigned to match the impedanceof the output tube's plate to thespeaker, and couple the audio sig-nal voltage to the speaker. They arenot exceptionally critical but an ex-act replacement is desirable to avoidpossible complications. Trouble inthe transformer can generally beeasily isolated by feeding an audiosignal to the output tube's plate.If electrical characteristics of thereplacement are proper, physicalsize becomes a problem only inmounting.

How to get more work out of your

OSCILLOSCOPEA complete guide to thehandiest instrument of all

MODERN OSCILLO-SCOPES AND THEIRUSES by J. H. Ruiter getsright down to earth inbringing you the complete"know how" of getting themost out of these amazinglyversatile instruments. Par-ticular attention is paid toalignment procedures. Everytesting detail is explainedfrom connecting the 'scopeand setting its controls toadjusting components in thechassis under test. Illus-trated instructions teach you

pattern analysis. Includes data on quantitativemeasurements (as used in color TV work) anduse of scopes in industrial electronics, teachingand atomic work. 346 pages, over 350 illustra-tions. Price $8.75.

Get your COMMERCIALOPERATOR'S LICENSE!

A fast, low-cost guideto FCC exams

Train for radio's best paid, mostinteresting jobs as a commercialoperator aboard ship, in aviation,broadcasting, telecasting and otherplaces where an FCC operator'slicense is a "must." LICENSEMANUAL FOR RADIO OPERAT-ORS is a quick, low cost guide tohelp you "breeze" through FCCexams. Clearly written and makesthings easy to remember. Reviewsalmost 2200 typical exam questions so you'llknow what to expect. Only $6.75.

Cash in on ELECTRICALAPPLIANCE REPAIRS!

A good -paying side line or fulltime business for trained men

Nothing is more logical than forelectronic service technicians toboost their profits through elec-trical appliance repairs-and here isa 370 -page, low cost book thatshows you how to handle everystep of the work! Includes "fastfind" troubleshooting charts-eventrains you in modern appliance re-finishing methods. Gives step-by-

step service details on practically every homeappliance including washers; ironers; toasters;ranges; cleaners; mixers; hotplates; razors;clocks; motors: water heaters and many more.Electrical Appliance Service Manual-Price only$6.75.

r - 10 DAY FREE TRIAL _Dept. ET -32, Technical Division #623900Holt, Rinehart and Winston. Inc.303 Madison Ave., New York 17, N. Y.

Send books checked for FREE EXAMINA-TION. In 10 days I will either remit pricesindicated plus postage or return booksand owe nothing. (Save/ Send cash withorder and we pay postage. Same 10 -dayreturn privilege with money promptly rs-funded.)

O MODERN OSCILLOSCOPES ANDTHEIR USES (#70118

C111)

$1.75O LICENSE MANUAL FOR RADIO

OPERATORS (#708537) 6.75

0 ELEC. APPLIANCE SERVICEMANUAL (#700172) 6.75

Name

Address

City, Zone, State

OUTSIDE U. S. A.-Cash with order only.Add SOc to price of each book. 10 -dayreturn privilege with money refunded.

Above offers expire Dec. 15, 1962



2 YEAR FIELD TEST PROVESU.S. PAT. NO.

2875440

Si 495List

Price

Of115

F -38K

Dept ET

ELECTRONICS, INC.BRONX 62, N. Y.

THE "FOCUS" F -38K

OUTPERFORMS ALL

OTHER INDOOR ANTENNAS!

i THE ONLY INDOOR

ANTENNA COMPARABLE

TO AN OUTDOOR ANTENNA!

BEST RECEPTION ON

VHF, UHF, COLOR, AND

FM ... EVEN IN SEMI -

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FEATURES

1. 102" of Dipole when fully extended.

2. Patented Diamond Phasing Loopsproducing the Power of 3 separateswitch type indoor antennas.

3. 12 Position Switch for maximumsignal.

ELIMINATES GHOSTS AND

CO -CHANNEL INTERFERENCE!

SOLD ON A MONEY BACKGUARANTEE BASIS!

34'$32per 100

EACH

ELECTRONIC

MARKET1 YEAR

GUARANTEEDRADIO TV TUBES

2TQUANTITYDISCOUNT


Al tube% nal nacattaillyI. but Si! be alectrelliCally parl/ct

lactary 2nd5 5/ used 1//ch 51 I! warted I1ICT10NIC 11041

4411 Ablate FREE anytuba that bacame%

Itlactiva is Ida Iflillo

I par Ulm date al purchasa III UAW indluduallyWad ITS

Myna Pd SAS listingOnly - Thautand% WA

lutts IA 11451'

024 SASS 64561 6[111 647 121111

1061 5624 61/1 6C16 6SL7 121111

6107 12114

1136T 5C68 6186 61116647 12CAS

11461 SRI 61619 SCM1

155 511691 674 1204

1T4 550 6106 SCOS 6T1 1211

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5146 OTS 6974666461

1241251

54661 61666 6C US1

614 12E16 6CUS

6467 1211

611 12687

prl tube

When purchasing lots of50 or more same type tubeApplies to tubes below only

141122414 5

21/14 54 6116 606

295 414 614 609

ALS 6447 6147 601661 64161 ISM

3E5 646 1111176T 696 12

3416NS 636 1205 1211761

3126 6A111 610661 616 1245 12107

12615 12/41

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ISA 647617 12A116 17/1661

344 41S WS 61617 1241 144

49711 61150 61156 617 1247 114146T

41 416 646 6467 1261461 111666

4121 SAU461 6117 4.567 1247 1 IT 1

496 ISAUSGT 6CASSD/ ST I 2S4 25141

SAM/ 49 6C AS OF 5 12157 !us

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41467 646 6117 1214 1554

ORDER SHIPPED SAME DAY RECEIVED

SHIPPING INSTRUCTIONS ELECTRONIC ARKETPAYS YOUR POSTAGE on orders or $10 or "an Pu SA.and Torrolorms Sand aeon, postege en Can..dun and foroqn orders Any order s Iten 510redone 25c sandi.ng there* Send ES%lee an C OD's.

ANY RECEIVER TulIE NOT LISTED ALSO AVAILAILEAT 34c EACH'

6510 14414 1115

IA U4 ISA

1247 1295 616405 1241 6117

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5005 6EU 12417 12107 rW4SAWS SAUK ICES KIK AARLIMA 12AU7 SAKS 461

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SILICON RECTIFIERSALL PURPOSE

Epoxy construction

500 MA -'TOP HAT'

COMPLETE LINE OF INDUSTRIAL TUBESONE OF THE

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I ELECTRONIC MARKET3750 E. 10th CT., HIALEAH, FLORIDA

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BUY DIRECT FROM RAD-TELSave on Rad-Tel's Quality BRAND NEW TUBES

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183 79 _6A15 .47 6B26 .55 12AU7 .601X2B .82 6AU6 6CB6 .55 _12BH7 .77

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_5U4 .60 _611Q7 1-00 6U8 .83 _5005 .53

- RAD -TEL TUBE COp"in 55 CHAMENS ST NEWARK S NEW JERSEY

TERMS 25% deposit must accompany al, orders. balance COO Orders under S5 add SIhandling charge plus postage (rders ore 55 plus postage Amos U tutees per I lb Subjectto prior sa e No COIts outsidc continental USA


NEWKRYLON CLEANERLUBRICANT SPRAY

To servicevolume controls,tuners,switches

Cleans away dirt and gummy deposits. Provides a nondryinglubricating film on contact surfaces. Gives long-lasting pro-tection against corrosion. Comes with 5 -in. flexible plastichose for controlled spraying in hard -to -reach places.

KRYLON CRYSTAL-CLEAR KRYLON

ACRYLIC SPRAT SPRAY PAINTS

MUM

Protects electronic parts.Use on TV, radio, h -fi,transmitting or testequipment. Protectsagainst hum dity, dust,corrosion and leakagecurrents. Long last ng.High dielectr c strength.

Choice of 24 standardcolors and 7 glowingfluorescent spray paints.Use for touchup, colorcoding, safety, or re-painting cabinets andenclosures. DRY INMINUTES.

If you prize it ... KRYLON-ize iflContact your Radio -TV jobber or write for

Krylon's new industricl products catalog

KRYLON, INC., NORRISTOWN, PA.

MARCH 1962

- - for more details, circle 23 on page 50 - - - for more details, circle 34 on page 50

71

Outperforms them all !Outsells them all !

JERROLD TRANSISTOR

POWERMATEPREAMPLIFIER

BY FAR THE BEST antenna preamplifier in the business-that'sPOWERMATE! On black -and -white, and where it really counts-oncolor TV-POWERMATE's superiority shows up across the country.

The better VSWR (impedance match), flat response, ultra -highgain, special broad -band neutralizing transformer, and better power -supply filtering-all add up to an outstanding product. No polarityproblems . . . no call-backs . . . transistor protected from lightning -coupled surges . . . remote a -c power supply feeds 2 sets.

Step up to POWERMATE, and step up to a tremendous new profitopportunity. See your Jerrold distributor now.

Model APM-1O1 $39.95 list, complete

JERROLD ELECTRONICS CORPORATIONDistributor Sales Division, Dept. IDS -216, Philadelphia 32, Pa.

Jerrold Electronics (Canada) Ltd., Toronto Export: CBS International, New York 22, N. Y.


. . Advertising Guide

Continued from page 41

2. Advertisements as a wholemay be completely mislead-ing although every sentenceseparately considered is liter-ally true. This may be be-cause things are omitted thatshould be said, or because ad-vertisements are composed orpurposely printed in such wayas to mislead.

3. Advertisements are not intend-ed to be carefully dissectedwith a dictionary at hand, butrather to produce an impres-sion upon prospective pur-chasers.

4. Whether or not the advertiserknows the representations tobe false, the deception of pur-chasers and the diversion oftrade from competitors is thesame.

5. A deliberate effort to deceiveis not necessary to make outa case of using unfair methodsof competition or unfair ordeceptive acts or practiceswithin the prohibition of thestatute.

6. Laws are made to protect thetrusting as well as the sus-picious.

7. Pricing representations, how-ever made, which are ambigu-ous will be read favorably tothe accomplishment of thepurpose of the Federal TradeCommission Act, as amended,which is to prevent the mak-ing of claims which have thetendency and capacity to mis-lead.

Limitations

No statement which representsor implies a reduction or savingfrom an established retail price orfrom the advertiser's usual and cus-tomary retail price should be usedif, (a) an artificial mark-up hasbeen used to provide the basis forthe claims, or (b) the claim is basedon infrequent or isolated sales, or(c) the claim is based on a pastprice, unless this fact is clearly andadequately disclosed.

"Two For One Sales"

No statement should be made inconnection with the offering for saleof a product to the consuming pub-lic of a "factory" or "wholesale"


price, or other such expression,which represents or implies that theconsuming public can purchase thearticle at the same price that re-tailers regularly do, and provides asaving from the usual and customaryretail price for the article in thetrade area, or areas, where the claimis made unless such statement is

true.

"Pre -Ticketing"No article should be "pre -tick-

eted' with any price figure, eitheralone or with descriptive terminol-ogy, which exceeds the price atwhich the article is usually and cus-tomarily sold in the trade area, orareas, where the "pre -ticketed"article is offered for sale.

Bait Advertising DefinedBait advertising is an alluring but

insincere offer to sell a product orservice which the advertiser in truthdoes not intend or want to sell. Itspurpose is to switch consumers frombuying the advertised merchandise,in order to sell something else, usu-ally at a higher price or on a basismore advantageous to the adver-tiser. The primary aim of a baitadvertisement is to obtain leads asto persons interested in buyingmerchandise of the type so adver-tised.

Guarantees In General

In general, any guarantee in ad-vertising shall clearly and conspicu-ously disclose-

(a) The nature and extent of theguarantee.This includes disclosure of-(1) What product or part of

the product is guaran-teed,

(2) What characteristics orproperties of the desig-nated product or partthereof are covered by,or excluded from, theguarantee,

(3) What is the duration ofthe guarantee,

(4) What, if anything, anyone claiming under theguarantee must do be-fore the guarantor willfulfill his obligation un-der the guarantee, suchas return of the productand payment of serviceor labor charges;

and(b) The manner in which the

guarantor will perform. Thisconsists primarily of a state-ment of exactly what theguarantor undertakes to dounder the guarantee. Exam-ples of this would be repair,replacement, refund. If theguarantor or the person re-ceiving the guarantee has anoption as to what may satisfythe guarantee this should beset out;

and(c) The identity of the guarantor.

The identity of the guarantorshould be clearly revealed in

all advertising, as well as inany documents evidencingthe guarantee. Confusion ofpurchasers often occurs whenit is not clear whether themanufacturer or the retaileris the guarantor.

"Satisfaction Or Your Money Back"Representations

"Satisfaction or Your MoneyBack," "10 -Day Free Trial," orsimilar representations will be con-strued as a guarantee that the fullpurchase price will be refunded atthe cption of the purchaser.

TRAIN WITH THE LEADER

FOR YOUR

FCC LICENSEPrepare for your First Class FCC License throughNRI's special and up-to-date FCC home -studycourse. Qualify for better paying jobs and growingopportunities open to you with your FCC "T.cket."Train with NRI-oldest andlargest school of its kind. MAIL NOW*

for more %fails, circle

aelf

37 on page 50

Binders . . .for your CIRCUIT DIGESTS

1034" x 141/4"are now available to ELECTRONIC

TECHNICIAN subscribers!These sturdy spring -type (no holes to punch) bindersare bound in dark red, hard bookcover material. . . they hold 24 monthly issues of CIRCUIT DIGESTSplus other reference literature . .. and are embossedin gold on the front and the back binding. AnotherELECTRONIC TECHNICIAN service - to help you pre-serve and get more convenient use out of your val-uable CIRCUIT DIGESTS!

$2.95 each-Postpaid(for Canada and Foreign-add 50( postage)

ELECTRONIC TECHNICIAN1 East First St., Duluth 2, Minn.

Please ship "CIRCUIT DIGEST BINDERS." I encloseS

Name

(please print)

Street & No.

City Zane State

MARCH 1962 73

NOW -FIRST TIME EVER!

The exact or equivalentreplacement for nearly every

record player made since 1930

MASTER CARTRIDGE

SUBSTITUTION

GUIDEBOOKby Jack Strong

For everyone who services or sells record players thisguidebook will pay for itself over and over again by:1. saving time in locating the right replacement

quickly.2. saving money by cutting down on the number of

cartridges you need to stock.This cross reference guidebook will help you locate theexact replacement or equivalent cartridge (mono orstereo) for virtually every record player made since1930. Even the old record players can be servicedthrough the use of universal replacement types. Thebook consists of two parts. In Part I, substantiallyall cartridges made since 1930 are listed, first bynumerical order, and then in alphabetical order.This listing also shows one or more equivalent car-tridge types and its manufacturer. Part II. lists(60) record player manufacturers, and the modelnumbers of their players, and the part number ofthe original cartridge used. #288, $2.00.

TUBE CADDY -TUBE

SUBSTITUTION GUIDEBOOKNEW 1962 EDITION NOW AVAILABLE

by M i M.ddielon

(Direct Receiving Tube Substitutions Only ... plusadded new feature -1300 direct CRT substitutions)

This direct substitution guide, designed to becarried in the tube caddy. contains only directreceiving tube substitutions -which can be madewithout modification of the wiring.

This guidebook will-save you time

eliminate carrying needless tube types enable you to select the best substitution minimize sales losses because you don't have

the right tube/t will pay for itself on the first service call/It contains substitutions for: Receivingtubes Ruggedized tubes European -to -American tubes American -to -Europeantubes Cathode -Ray Picture tubes.

Cat. #299 . . . still only 90cCAUTION-You can't afford to be without this book)HOW TO AVOID LAWSUITS IN TV -RADIO -APPLIANCESALES & SERVICE hy Leo Parker. ". . . A valuablemanual for the techiniclint ..."-ELECTRONICS oRLD. When can a serviceman collect for repairs? When is a service guarantee enforceable 7 Whencan a serviceman demand cash payment? Whendoes a lien protect a serviceman?? How can aknowledge of contract law earn profits? Howvalid are written contracts? What are the insur-ance laws? These are just a few of the vital ques-tions that are answered in this book written by anexperienced lawyer. It covers many situations thatyou may face if you sell equipment, enter a home toservice it or receive equipment for servicing in yourshop. #283. $1.00.You can depend upon any of the direct substitutions in

INTERNATIONAL TRANSISTOR SUBSTITUTION GUIDE-BOOK by Keats A. Pullen, Jr. Eng. D. (ScientificStaff, Ballistics Research Labs.. Aberdeen ProvingGrounds) direct substitutions only "possible sub-stitutions deemed doubtful", that is they work onlyIn some cases, were omitted . . . thus, substitutiongeld. Is a 'safe' guide." - INDUSTRIAL ELECTRONICENGINEERING AND MAINTENANCE. It's complete andcomprehensive - lists 4500 direct substitutions com-prised of American. Japanese, British, French.German, Dutch and Italian transistor types. In-cludes both triodes and tetrodes. Not only are thedirect electrical substitution shown, but case styles,dimensions and basing diagrams for the originaland substitute also are given. #276-$1.50.

At your Electronic Parts Distributor,or order direct from publisher.

Dept. ET -3

JOHN F. RIDER, PUBLISHER, INC.R,der a,v,s.on of Hayden Publishing Co., Inc.

116 West 14th Street, New York 11, N. Y.In Canada: Charles W. Pointers, Ltd.

66 Racine Rd., Rexdale, Ont.

NEW BOOKS mend this book, but unfortunately wecan't.

SERVICING TRANSISTOR TV RE-CEIVERS. By Milton Kiver and CharlesGray. Published by Howard W. Sams& Co., Inc. 269 pages, soft cover. $4.50.This is an inviting book that offersreaders a detailed view of transistortelevision sets. Commencing with twochapters covering basic transistor theoryand circuits, the authors then dig intohow they're used in TV receivers. Eachsection of a receiver is examined inturn. How they work and why-includ-ing circuit values-is covered in sevenmeaty chapters. A final chapter dis-cusses servicing techniques, includingkey test points. The book is well illus-trated and lucidly written. Some math isincluded for those interested, but it maybe skipped by readers without losing theflavor of the book. Highly recom-mended.

WORKING WITH TRANSISTORS. ByA. C. W. Saunders. Published by Elec-tronic Technical Publishing Co., Box306 -Astor Station, Boston 23, Mass.126 pages, soft cover. $4.95

Elements of transistors and how theyare used in various circuits is presentedin this book. It's divided into lessonsrather than chapters; perhaps due to itslogical building blocks starting withbasic theory and concluding with specialcircuits such as protective circuits andgas fume detectors. The book is easyto read; drawings and schematics arevery large and math is limited to simplearithmetic when employed. Good, de-tailed descriptions of transistor circuitoperations will probably untangle someconfusing concepts held by techniciansnot too familiar with transistors. Ex-cellent home study book.

THE HORIZONTAL OUTPUT SYS-TEM. Published by M. A. Schwarz,Petersburg, Va. 34 pages, soft cover.$2.95

This is a manual that purports todescribe a new technique of testing hor-izontal output systems using a VTVMinstrument only. We do not believe itaccomplishes its goal. The text's es-sence is the author's interpretation ofhow a horizontal output system and itscomponents operate. It includes someambiguous and incorrect statements.Additionally, it has not been editedproperly, in our opinion, for clarity andcontinuity. We wish we could recom-

IF YOU CHANGE

YOUR ADDRESSNotify us at 1 East First Street, Duluth2, Minn. Please include the address labelfrom a recent issue and allow 30 daysfor the change.

FM STEREO MULTIPLEXING. ByNorman H. Crowhurst. Published byJohn F. Rider Publisher, Inc. 282 pages,soft cover. $1.25.

Here's a most timely book. It coversthe FM stereo system of broadcastingand reception in a welcome manner.FCC standards are explained and re-ceiver circuitry is thoroughly coveredfrom theory to practical circuit opera-tion. A third of the book is devoted toinstallation and conversion problems,alignment and performance checks, andtroubleshooting procedures. Many schem-atics of stero tuner sections and com-plete stereo FM adapters are included.This is an excellent technicians' primerfor stereo FM.

HINTS and KINKS FOR TV, RADIO,AUDIO. Edited by Martin Clifford.Published by Gernsback Library, Inc.128 pages, soft cover. $2.35.

Hundreds of gimmicks and gadgetsfor TV, radio, and audio equipment,shops, and instruments are presentedhere. They have been selected fromitems previously published in periodicalform. Many will interest technicians;some will probably be used to substitutefor unavailable gadgets that could sim-plify a particular task.

f:. (those whoServe Best

Use

QUIETROLEThere's never any doubt

with QUIETROLE . italways says "Sh, Sh" to

noisy controls andswitches on TV, radio and

electronics instruments.Now, Quietrole is even

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reach places right on thebutton. It's Quality

Quietrole that makesthose once pesty repairs

easier than ever.See how Quietrole can

ease the jangled nervesof even your hardest to

please customers.Quietrole, helps the

serviceman serve betterthan ever.

6 oz. SPRAY PACK CAN(with FREE Extender Tube)

2, 4, II az. Battles(with dropper)

Product of

QUIETROLECOMPANY

Spartanburg, South Carolinain Canada: CROSS CANADA ELECTRONICS

12 Laurel Street, Waterloo, Ontario - - - for more details, circle 40 on page 50

ELECTRONIC TECHNICIAN- - - for more details, circle 43 on page 5074

Higher Gain

In TV It's Stan a

Lower Noise

85% of all TV servicemenprefer Standard :urret typereplacement TV tuners.

1 year guarantee backed bythe world's largest TVtuner manufacturer.

Trade-in al:owalce for thedefective tuner beingreplaced.

See your local authorized Standard Coil Distributor

INDUSTRIES INC.FORMER_' STANDARD COIL PRZ.DUCTS CO.. INC.. MELROSE PARK. ILLINOIS


!inportant News for Independent TV-Radio-HiFi Service Dealers...

RCA Announces A Major New ProgramTHIS PROGRAM WILL...

Identify You as a Trusted Service Dea)er Highlight Your Technical Competence Enhance Your Community Prestige Symbolize Your Professional Integrity Build Your Public Recognition and Acceptance Help Increase Your Business Volume and Profits

See your Authorized RCA TubeDistributor for full details onhow you can participate in theRCA Key to Trusted ServiceProgram, which is heavily ad-vertised to consumers throughTV Guide and NBC-TV.

RCA ELECTRON TUBE DIVISION,HARRISON, N. J.

The Most Trusted Nanie in Electronics

ctronic hnic · 2019-07-17 · ctronic hnic including 16 pages of latest circuit digests...

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