Haven’t done any transistor based PPs, but I’ve messed with tubes. Would your circuit be tweakable with adjustable bias or bias balance as it’s done with tubes? If the old NPN is cooked I’d go replacing PNP and NPN sides with new transistors and adding a bias adjustment addon there.
With tubes...
Dunno if this helps, but while ago I cooked couple Ge transistor exceeding their max current limit with trimpot on FF circuit and after that my cheap component tester read cooked transistors as shorted/faulty component. Cannot recall if it was E or C tied to B, but nevertheless that gave a diode...
Some E83CCs and couple 5751s bought within last two years. Haven’t really looked into manufacturing time, but there’s always a chance they date earlier.
Couple months ago I bought NOS Telefunken 12AT7 from my local shop with ~20 coins and I know they’re reliable and test their tubes. Still it wasn’t good and had terrible microphonics. Got money back and they let me too keep the tube. Haven’t had guts to test it again, but maybe some day it find...
I have three leftovers of a quad. The fourth one gave up and made a good flash. Willing to trade those for some NOS ecc83 goods. Maybe we first need to wait this import/export toll thing figure itself out?
Have you tried jumping R17 with alligator clips if it brings Clean vol up? I’d start from there if there’s no cold solder spots or other problems you catch visually or with DMM.
If jumping R17 works, maybe change Clean side switching circuit same as in OD side.
Edit. hold your horses and do...
Now it all starts to make sense as concept described at start was a bit hard to grasp. If it’s tone and vol only, why not go mechanical route first with sliding pots or rollers (like in keyboards) attached to regular pots?
It’s the reason I use Ge-FF as first pedal in board. Why it isn’t possible? What you’re doing seems complicated and I wonder wouldn’t it just be enough to include (AMZ) pickup simulator w/ transformer or real pickup coil into the fuzz box circuit or before it like others do it and call it a day...
Im reading this over and over again, but cannot understand what is a midi controlled pickup simulator, why you need one and what you think it’s gonna solve. :unsure:
To say what to look at, please define what kind of change you’re aiming to? Less brite or more everything?
That’s tone circuit in the NFB partion of an operational amplifier stage.
R12 ratio to two 3.3Ks parallel with pot between sets gain and pot setting also affects low freq content passing...