Sch BOM
R1
1K5
R2
470K
R3
100K
R4
390R
R5
1k
R6
15k
R7
15k
R8
8k2
R9
100k
R10
100R
R11
470k
R12
8k2
R13
43k
R14
470k
R15
15k
R16
390r
R17
6k8
R18
33k
R19
430k
R20
10k
R21
2k2
R22
100k
R23
100k
R24
1M
R25
2k2 (CLR)
C1
100n
C2
100n
C3
100n
C4
100n
C5
470p
C6
470p
C7
100n
C8
680p
C9
2n2
C10
6n8
C11
100n
C12
100n
C13
100n
C14
100u
D1,2
1N34A
Q1-4
2N5088
TONE
100KB
VOL
100KB*
DRIVE
100KA**
or
100K trim
Original has been produced in both two and three
knob versions. It’s up to you whether you add an
external drive control. This schematic is traced from
an original 2-knob unit. We don’t know if any changes
have been made to the circuit when it was changed to
a 3-knob format.
*Linear volume pot isn’t great. Log is better.
**Use EITHER the DRIVE pot or the DRV trimmer.
