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Clean build! I have a question about Q2&3, have you measured collector voltages and how they measure? I built this circuit too, tried few different transistors (low and mid gain Ge and Si ones from 200-450), but Q2&3 collector values stay around 6.8-7vdc.

A picture from pcb underside to see component solder joints would be golden. It’s easy to spot solder bridges, cold joints etc from a good picture! Have you double checked component values around charge pumps? Have you set led trimmers according to this: Do one side at a time. Set the rate...

Could be nothing, are the silent ones are without pot lug extension wires?

Remember to post pictures of your build to help troubleshooting, but if what @Cybercow pointed out doesn’t remove the noise it’s good to look into lead dressing. Are in and out wired running near noise emitting components and is shielded i/o wiring needed?

But but but buttt my G(e)FF sounds bit different day to day… Yeah it could be temperature drifting, but it mostly got to do with WHERE I stand in rehersal room, how guitar feedbacks on that particular spot. And this whole sensitivity changes with how my amp gain stages are set, but the most...

I think using one or two mechanical switches defeats the purpose what relay switching is used for. It’s for 2-3x longer life in use compared to a latching one. Swtch on pcb could be led pwr out, but without pcb schematic or docs in hand its hard to make more than a guess. So you want: -relay...

That’s missing pwr gnd reference for pcbs, won’t work as intented. Your first posts picture is an attempt for star grounding method, but misses one thing about shielding. If going for star-G, the shielding should be with one single common gnd reference and all gnd leads should go to one single...

Fix the schematic with white textil painter pen! There’s no other option.

Well this thread really grabs attention and educates, please continue! :)

This has been my main pedal since build. Q1-2 use germ-transistors you have, 30-60hfe. Q3 germistor or Si. I used really high gain darlington, but find no use for MORE-switch (boost) as darlington transistor used takes off fuzz’ edge too much.

I’ve had problems with sockets making bad contact, pots with unreliable carbon tracks/contact and transistors cutting off. So yeah, subtle faults.

I’m using steel wire balls meant for cleaning stock pots. They’re found from your local hyper market or grocery. Do whatever with this piece of information about the misuse of kitchen stuff.

One more thing about your test with and without pedal in front. Are you sure your ears tell the truth and mix hop on gain level and compression as more bass? Record or look into it with visual eq/freq analyser (for example voxengo span), but remember to set volume on both options as near as you can.

Probably reduces unnecessary bass freqs and helps to avoid overloading transistor. Is there enough lows for you atm?

That’s a squeeze! Nice work. How you figured out promixities of different stages and did you plan safe distances on ’em? And how’s the overall hum&noise floor?

One bolt to shield ’em all. Quick update: -getting terminal strips, power filtering caps and resitors this week :) -incircuit polys are somewhere on way and I cannot track ’em :(

FF FFS

Did you try different power supplies or 9V battery?

First thing wired and had some difficulties getting thick solid wire through pin terminals. Gonna make it more tidy, trim wire ends and add next twisted pair leading to PI heaters before soldering. Oh, and preamp circuit is going to be mix between 1gen model T and EL34worlds Plexi with hot...

Cleaning chassis off unnecessary pcb standoffs, removed choke and test fitted tube sockets to help visualizing heater and PT wiring.