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Catalinbread CB30 - Schematic
Some people have complained that the CB30 lacks a little gain, I'm not sure it does but here are a few mods and suggestions which will allow you to pump up the available gain without removing too much of that Vox character;
- Reduce the value of R1 (maybe 10k),
- Increase the value of C4 (47n or higher),
- Increase the value of C7 (1n-10n),
- Remove R7 or just reduce it's value,
- Make Q5 a jfet gain stage instead of just a buffering stage.
NOTE - these modifications will alter the frequency response of the pedal somewhat, it's about tweaking it to your taste while attempting to retain that Vox character!
Tube Screamer - TS808 / TS808HW Hard Wired Version
Values:
C1 - 22nF
C2 - 1uF
C3 - 47nF
C4 - 51pF
C5 - 220nF
C7 - 47uF
C8 - 1uF
C9 - 220nF
C10 - 100nF
C11 - 10uF
C12 - 100uF
D1 - 1N914
D2 - 1N914
D5 - 1N914
IC1 - JRC4558D
Drive - 500K
Level - 100K
Tone - 20K
R1 - 1K
R2 - 510K
R3 - 10K
R5 - 10K
R6 - 4.7K
R7 - 51K
R8 - 1K
R9 - 10K
R10 - 10K
R11 - 220R
R12 - 510K
R13 - 10K
R14 - 10K
R15 - 100R
R16 - 10K
R17 - 1K
R18 - 1K
R23 - 1K
Q1 - 2SC1815
Q2 - 2SC1815