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Nothing stands out. (But then again I'm sitting down.) Have you breadboarded it for verification?

Every time! Here are two PedalPCB "Sunn-T" builds using TO-92 J201s biased at 5.0V on their respective Drains. Detailed planning & wire weaving is crucial . . . . Sunn-T for the 70's-80's win!

Yes, but such potential feedback must be managed with control blocks. Use the left & right channels with independent processes between the In and Out blocks in SpinCAD. SpinCAD's "IN" block actually has two inputs and two outputs. Similary so does the "OUT" block have two outputs, but it can...

Sorry, I meant #9 & #10. (Fat-fingered again. :cautious: Now corrected.)

That PT2399 looks odd . . . . the dimple is at the wrong end or the printing on it is upside down. I don't see a mouse-bite at the top either. Pin #1 should be at the top. Pull it and see if you read ~4K7Ω across pins #9 & #10 and ~4K7Ω across pins #11 & #12. Should be ~+5V at Pin #1.

Yeah, seeing that confirms my suspicions. IMO: the volume pot would be better served after the opamp, in place of R19.

Can you at least schematically show us how the Blend is followed by the Volume? It's possible the issue is there.

Kewpie Fuzz; Creamery Compressor; Seahorse; NuTube Screamer & Friendly Fire Fuzz . . . .

Schematic? Good clear photos of the build?

The HolTec HT8972 is a clone of the PT2399. If you can find one.

Oooh! A Sea Cat Fuzz!

Try thinking of the Pythagoras and Arachnid boards as an old fashioned "cassette player". And the EEPROM as a blank cassette that can hold up to 8 songs (patches). All of the other components are there simply to access & read what's on the EEPROM. The Pythagoras board will only access & play the...

I pre-ordered a few in October from CabinTech Global, but I don't expect them to arrive till February or so. The manufacturer doesn't seem to offer direct sales except in batches of 1000+

Sort of. Instead of using a 500K pot on pin #9 of the SSM2166, there is just a 100K resistor going to the +5V supply line. So it can easily be modified by replacing that resistor with 500K pot in rheostat fashion.

Thanks Feral! You mean like this . . . . . ?

Thanks! Yeah, it is a variant with a lot of matching values. Crazy how this one really pushes the Boost (originally 'Gain' using a 2K pot in Orman's) towards OD/distortion with the 5K pot.

Messed about with an SSM2166 and came up with this configuration. Just using two pots, but added two more stomps. The pots are Sustain (compression) and Boost (volume). The Sustain and Boost stomps are wired in such fashion as to jumper the 2nd lug on each of the pots to jump immediately to max...

Thank you!

The compression. And thank you!

I cheat by sending my enclosures, artwork and drill dimensions to AmplifyFun in Portland where Spencer does a great job.