Rub-a-Dub Reverb Mods
Just some notes I found around online. Need to verify them.
Output Boost:
R5 pins 1 and 2 on a 10k potentiometer.
I’d recommend putting a 10k in series with a 10k pot.
Damp Control:
R9 and R10, you can substitute one of these resistors for a 5kB pot.
lug 1 and lug 3 goes where the resistor was and lug 2 with a 68nF goes to ground. This should work as CJ damp control, just the values are different. (10k for 5k and 33nF for 68nF)