12

34567

8 9

100k

0.01

uF82

0

470k

R17

56k

0.02

2uF

8.2k

0.01

uFR1

9 10

0kR

18 1

00k

R16

470

k

R15

470

k

0.01

uF

8.2k

8.2k

/3w

100/

3w

12

34567

9

23456

78 91

23

456

78 9

GR

EEN

GR

N/Y

EL

YELL

OW

BLA

CK

BLK

/RED

(240

v)

RED

/YEL

GR

EEN

YEL

/ WH

ITE

WH

ITE

BLA

CK

/ W

HIT

E

RED

RED

V1V2V3V4V5 V6

LO

HI

NORMAL (input)VOLTONETMB(imput)VOLTREBLEMIDBASSPOWERSTANDBYINDICATOR

100k

R1 100k

0.01uF

0.005uF1M

HOT

NEU

TRA

L

GR

OU

ND

ECC 83/12AX7 ECC 83/12AX7 ECC 83/12AX7

500k-A500k-AR35-500k-A250k-L25k-L1M-L

a fusion layout after the ones drawn by Jersey Aaron and John Herrick (jhguitarlab)watt.com181 8 W A T T C O M M U N I T Y C E N T E R

Fuse

ground buss

18 WATT TMB (Derived from Richie's schematic)sssssss)revized: June 22, 2004

TWEAKER'S TABLE

R2B

2.7

k82

0 50uF

/50v

C11

B .6

8uF/

50v

470k

0.02

2uF

16uF

/475

v

100k

470k

1.5k

16uF

/475

v

500u

F/50

v

125/

5w

2.2k

/2w

0.02

2uF

0.02

2uF

1 82

34567

8 91

23456

78 9

1

1M-A

MasterVolume

1k5/5w

R8 1M

18watt.com ID Tweaks

Plexi R2B/C11B: 2.7k/.68uF-2.2k/2.2uF-1.5k/25uF-R17:47k, R8:470k-560k-820k, MV pot:500k, R1:33k(more gain and treble)-47k(middle of the road between the values)-56k(more bassy slope less gain), C14:250pf-330pf-500pf, R18/R19:82k or 68k(add a 100pf cap between the plate resistors), R15/R16: 330k or 220k

47k

56k

C14

330

pF