AccutronicsReverb Assembly

9AB3C1B

C

1.5K

100K

25µF

1

2

3

1.5K

56k

PreampV1B – 12AX7

6

7

8

DWELL250K-L

.01

.1

1M

1.5K

6

7

8

C

10K

C

33K

.002268K

220K 8

5

3

4

1K 3

W

25µF

220µ

F

1.5K22

0K

100K

.1TONE50K-L

REVERBFOOTSWITCH

1

2

3

Recovery ampV1A – 12AX7

SPEED3M-RA

8

7

6

470K

1M

1M

.01.01

.022

100K

4.7M

INTENSITY10M-RA

.047

.0047

A

.01

FAST

SLOW

LED

1.7

Vibrato OscillatorV5B - 12AX7

.01

5.1M

1.5K

1

A

2

3

VIBRATOFootswitch

.047

470K

.22

.047 1M

1M1M

2.2K

2.2µ

F

250p

F22

0K

470K

220K

.01

.004

7

100K

B

100K

B

.022 220K

220K

22K

470K

470K

022905

.01

250pF

MIX500K-A

220K

C

A

ModulatorV4B – 12AX7

8

7

6

3

2

1100K

.001

1M.047

Note. All voltages measured with Fluke 87V. Line input set to 120VAC. All controls set max CCW. Tremolo oscillator was disabled for steady readings on V5.

221

122

1.9

0 0

1.9

126320

330

23

0

1.7

0

259 259

259

330

259

170

1.3

0

304

252

2.4

0

250

0228

1.5

0

187

0

6.3VACrms (17.8Vpp) with SPEED set for 5Hz and

INTENSITY set max CCW

REVIBE by SluckeyBased on 6G15 reverb unit and 6G12 vibrato circuit.

330100/100µF100/100µF

125C3A 4.7K/3W 10K/3W

C259

B304

A330

3.15-0-3.15

260VAC@ 100mA

V5V2V1

4 4

99

5 5

V4

4

9

5

NEUTRAL

LINE

1 AMPSLO BLO

POWER

Weber WRVBPT

4

9

5

120Vac

7

2V3

304

Power Supply nodes rearranged.Footswitch moved to top of Intensity pot to allow the oscillator to run continuously. This provides instant on/off.Added FAST/SLOW frequency range switch. 5.1M resistor paralleled with Speed pot to limit low end of frequency range. C27 changed to .047µF and C18 changed to .01µF because they were attenuating the higher LFO frequencies too much. V5A and V5B positions swapped to work better with my layout.Removed C20 bypass cap from V5A cathode. Replaced C17/R29 with yellow LED. Pure eye candy! Replaced R60 with 56K to lower the gain of V1-B and prevent overdriving V4.Added LEVEL pot to adjust signal input to V4.Replaced R45 with 2.2K to lower the gain of V4 and prevent distortion of hot input signals.Replaced R62/R63 voltage divider with 220K/15K to provide unity gain from input to output jacks.

List of Changes (refer to original Hoffman schematic)

0

180

This unit was originally built exactly IAW Hoffman’s Revibe schematic. I later made the following changes.

Normal “Dry” signal

Hi pass

Lo pass

Vibrato signal

Vibrato InverterV5A - 12AX7

ModulatorV4A – 12AX7

PreampV2 - 12AT7

Power ampV3 – 6V6

Use red or yellow LEDrated for 1.7v to 2.0v @ 20mA

84VACrms

Reverb signal

Vibrato oscillator signal (3Hz to 10Hz)

220K/3W

332

DC voltages for V5B measured with top of SPEED pot grounded to disable oscillator.

LEVEL500K-A

4

5 6

78

12

3

12

345

67

89

12

345

67

89

12

345

67

89

12

345

67

89

125A35A OT

REV FS

Tone50K-L

T

S

GReverbLevel

500K-A

TS

GIntensity10M-RA

Speed3M-RA

Dwell250K-LSlow/Fast

InputOutput

+ +

250µF 50V

.01µF 400v250p

0.1µF 400v

.01µF 630v

.0022µF 630v

+ +

22µF

.022µF 630v

250p

.01µF 630v.0047µF

630v

C

0.1µF 400v

+ +

22µF0.047µF 250v

0.047µF 250v

.047µF 400v

0.22µF 400v

.01µF 400v

.01µF 400v

.022µF 400v

VIB FS

LED

A

REV Return

+ +

2.2µF

VIB FS

REV Send

B

.0047µF 630v

.01µF 630v

HT

HT

6.3

6.3

B+

+ AC

-AC

.01µF 400v

.047µF

A

RG 3

16

.001µF

63

0v

V5 V4V3

V2 V1

Vibrato Level

500K-A

Turret --- drill size is 3/32"

Hole for wire pass thru – drill size to fit

Standoff – drill size to fit

Dashed lines are underboard jumpers

INSTRUCTIONS FOR PRINTING DRILL GUIDE

NOTE… This drawing contains layers. Turn off all layers except instructions, turrets, jumpers, screws, and pass-thru holes.

Board size is 3 1/8" X 12". Print two copies of this drill guide FULL SIZE on legal sized paper. One copy will be used as a drill guide. The other copy will be used for installing jumpers. Measure the board length of the printout to verify it is 12". Attach to blank board using double sided carpet tape. Use a center punch to put a mark at the cross hairs of each turret, standoff, and hole. Use a 3/32" drill bit to drill all holes. Then enlarge holes as needed for screws and wire pass thru.

DRILL GUIDE

125C3A CHOKE

ACB

WRVBPT

to filament string

FUSE

connector

1A

not used

B+

+ AC

-AC

HT

HT

Filamentartificial center

tap not used

100/100µF100/100µF

125C3A 4.7K/3W 10K/3W

C258

B303

A329

V3 R

ever

b dr

iver

V5 tr

em o

sc/in

v

V4 T

rem

mod

ulat

or

V1 &

V2

reve

rb

3.15-0-3.15

260VAC@ 100mA

V5V2V1

4 4

99

5 5

V4

4

9

5

NEUTRAL

LINE

1 AMPSLO BLO

POWER

Weber WRVBPT

4

9

5

120Vac

7

2V3 to V3 pin 4

ABC

line cord

1

23

456

78

9 1

23

456

78

9 1

23

456

78

9 1

23

456

78

94 5

67

81

23

1.001.501.881.50 4.38

125A35A OT2.80

125C3A CHOKE

2.5" x 1.5"

2.001.75

WRV

BPT

3.56

0.50

0.50

Chassis size 17" x 6 ½" x 2 ½"

1.881.13

3.00

1.13

0.63

+ +

250µF 50V

0.1µF 400v

.01µF 630v

.0022µF 630v

+ +

22µF

.022µF 630v

250p

.01µF 630v.0047µF

630v

C

0.1µF 400v

+ +

22µF0.047µF 250v

0.047µF 250v

+ +

22µF

+ +

22µF

.001

µF

630v

.047µF 400v

0.22µF 400v

.01µF 400v

.01µF 400v

.022µF 400v

VIB FS

+ +

2.2µFB

+ AC

-AC

.0047µF 630v

.033µF 630v

A

1.00

2.37

***BOTTOM VIEW*** ***BOTTOM VIEW***

1.00 1.50 1.88 1.504.38

OT CHO

KE

2.00 1.75

Chassis size 17" x 6 ½" x 2 ½"

3.00

1.130.63

Reverb Tank is 16.75" X 4.3125"

Chassis size 17" x 6 ½" x 2 ½"***TOP VIEW*** ***TOP VIEW***

17.00

1.501.251.251.251.251.251.251.251.25

DWELL INPUTTONEOUTPUT LEVELINTENSITYRANGE SPEED

5 67

8

9100

1

2

34 5 6

7

8

9100

1

2

34 5 6

7

8

9100

1

2

34 5 6

7

8

9100

1

2

34

REVERBVIBRATO

6G15 reverb unit and 6G12 harmonic vibrato

Luckey’s5 6

7

8

9100

1

2

34

2.50

LEVEL

5 67

8

9100

1

2

34

1.25

1.75 1.50 1.25 1.25

Reverb F/S Vibrato F/S

1.501.25

Fuse

Power cord1A SLOWPowerIndicator

1.25

Center line

REAR PANEL

1.25