From a previous thread by Jovi Bon Kenobi:
Thanks folks! Here are the gray spec subs from Mr. PedalPCB.
Add 25pF cap across R2
R3 47K
R5 470K
R6 20K
R7 20K
C1 2n2
C4 22u (positive lead in left pad)
C5 2n2
C6 10u
D1 1N4148
D2 1N4148
Gain C500K
Volume A10K *I used an A100k here*