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Hmmm. THis sounds odd, but get a little scrap of aluminum foil and put it over the LEDs and see if it gets better. Careful not to short anything. Thought process, LEDs can act like small solar panels. Maybe they're picking up elextrons from the superbright led or the tube itself. I suppose it's...

TL072 max voltage is 30v. I wouldn't push it to that. 2134 is 36V At 30v, you'll need 50/63v electros, which will be pretty large. Honestly, 18V is going to give you enough headroom for anything.

Welcome to the hobby/obsession as well as to the forum. As mentioned before, pics=1000 words Both sides of the PCB if able, including all wiring.

Nothing substantial to add except if you do take "better employee" courses, make sure you get paid for them. If they expect you to do these off hours or without compensation, either tell the to F off or negate your other duties to do them. "Get better on your own time" has become a new wrinkle...

His uniform does not impress me

One can probably use a DPDT 111 and get the order to be high med low There are a couple of ways illustrated in @Feral Feline 's switching thread Or maybe FF has them at paws length.

Paging Big Mork No worky on mobile All I can hate on is this That's it. Excellent build and execution as always and jebus did that enclosure come to fruition quickly!

I don't think (with my half brain) that the LEDs are the issue. I think it's DC leakage. It's essentially creating a DC offset. Once the audio drops below the EC level, it doesn't exist to the diodes. It just looks like DC and is going to ground. It's bit noticed on the other diodes due to the...

I'm working on a SiGe² sziklai pair FF currently. I'll share it when/if I can get it tuned in.

One option Tie all legs 1 to ground Switch both leg 2 and leg 3 on each pot with the switch. That will occupy all 4.poles but it will work and the pots won't interact with each other. Putting the resistances in parallel won't be fun. When you adjust one, it will impact the other setting...

It's early but I think there's a false connection on that schem Correct: So it should be either Buffered bypass, circuit output grounded Circuit out to out and buffer floating. I would invert SW1B where the ground connection is SW1B2 so either the buffer or circuit output is grounded...

F*cking Thevenin theorem? And then after you pound that into your head, you start siming and never touch it...

It's a balance of current/heat/efficiency. Kirchhoff.

I missed that switching logic I need to get on desktop. I can't do this maze schematic shit on mobile.

Does that pin on J509 change state when it should?

Those "digital" transistors are essentially pre biased BJTs. Easy drop in switches. I would wholly suspect Q507. Maybe one of the internal resistors opened/shorted/drifted. Edit. Possibly when someone plugged it into a 64 volt AC supply lol

4bit logic?

Did it work properly yesterday? Bypass work?

What's going on with the footswitch wiring?