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Oh - D1 is backwards.

Again, just checking some basic stuff... make sure the transistors are firmly seated in the sockets and try it again with the back off the pedal and the pedal upside down. It doesn't look like the transistor legs are tacked into the socket so it could be a loose connection there which could be...

A photo of the underside of the board, please and thanks? The voltage on Q3-C is a little high, but I'm not sure if that would be causing that sputtery gating. TBMKIIIs are extremely forgiving and usually sound excellent with any ol' transistors in them. They sound pretty good with silicon...

I don't think the OP is saying this IS the case, just that it's a possibility that something is loose.

Oops my bad - OUTPUT. Got the names jumbled.

The "after output" control is a voltage divider on the ouput, so if that knob isn't turning the volume down at all you most likely have a problem with that particular component and surrounding circuitry. There's not much happening between lug 2 of the after pot and the output pad of the board...

I'm sure everything is as it should be, but fwiw there have been countless times where I've looked over a board a thousand times, certain everything is fine, and someone else has immediately noticed an IC leg sticking out of a socket or one side of a resistor not soldered in.

party thread commences

Break the centering tab off of another pot and jam it in the split.

Nothing to see here 🙃

Can you post a photo of the underside of the problematic board? It sounds like maybe you have a solder bridge or something that's causing a feedback loop/oscillation. If you figure out what you did wrong you can put it on a momentary footswitch and your bug becomes a feature.

One option: Pull R5 and C5. Use a continuity tester to figure out which R5 pad connects to C4, and which connects to ground. Connect Lug 3 of a 100K pot to C4 via the appropriate R5 pad. Connect Lug 1 of the pot to ground via the other R5 pad. Use a continuity tester to figure out which C5 pad...

https://www.diystompboxes.com/smfforum/index.php?topic=107560.0 I"m not sure if this is exactly what you're looking for but if you search DIYS and FS there are a *LOT* of threads about diode clipping.

The OP was polite enough to ignore this, but I'm just going to point out how needlessly rude and unhelpful this was.

You will never in one thousand years, all things being equal, hear any noticeable difference between two sets of diodes in any real world playing situation. I sincerely doubt anyone here would be able to consistently identify differences in diodes in a blind test once things were normalized for...

FWIW, it's probably handy to have some degree of familiarity/consistency with the technical terms to make troubleshooting a problem a bit faster for everyone involved. It's much easier to type, "can you give us Vcc, Vc, Ve?" rather than step by stepping where to put the multimeter probes.

I'm no EE so I could be wrong but my understanding has always been that... Double letters (Vxx) are power supply voltages, the letter refers to where the voltage is headed (Vcc = collector voltage, Vss = source voltage) Single letters (Vx) are voltages with reference to ground (Vc = collector...

PTP and tagboard projects aplenty over here: https://vero-p2p.blogspot.com/

I have a lot of respect for her unwillingness to compromise on the idea that for it to be a "frantone" it has to be made locally, by hand, and to an exceptionally high standard. She hasn't been able to find vendors for case finish or PCB manufacture in/around Philly, and thus no pedals. That...

One is meant for use with NPN silicon transistors, the other with PNP germanium.