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If you aren't already, try biasing with a trim pot on either the collector of Q1 or the emitter of Q2 (with the fuzz pot wired as a variable resistor in series with the emitter bypass capacitor). It won't change the tone or output volume nearly as much as using a trim pot on the collector of Q2...

Get yourself a used Herman Miller Aeron and call it a day. Where I live, there is generally a good selection of them on Craigslist for well under $300. I’ve tried a lot of other office/gaming chairs, and none of them have been as comfortable or good for my posture. They’re build very well, too...

Give the R.G. Keen method a try.

Those gains are great for fuzz pedals. I bought a hundred 2N1304 a while back and they had been great everywhere I used them.

Hola, esperamos que no seas un bot, jaja. ¿Qué tipo de circuito es tu proyecto?

You can also put your probe on the end of the resistor that connects to the collector of Q2.

That's been my thinking, too. (Admittedly, I also have mocked up a design for a consolidated I/O and relay bypass PCB, but that's kept me from pulling the trigger and ordering it.) Having separate boards for relay bypass also makes it easier when you're doing something like a Megalith or a Hoof...

I think that @szukalski may have made one like that, so it’s definitely doable

Q3's collector voltage is -9v?! 😲

Where do I sign up?

I’m game.

Do you try removing the 1044 and see if that stopped the whine? The NPN side doesn’t need the 1044.

Correct. You want to change the clipping caps (the ones between the diodes and the collector), not the coupling capacitors. I don’t have a standard order of making the changes, though.

Try 47n clipping caps, 430pF filter caps, and 1N400x/1N4150/KD521V clipping diodes. Adjust the transistor/collector resistors so that you get the collector voltage a little below half of VCC, e.g. 4.2-4.3v when VCC is 9v. Should get you some massive low end.

Germanium is much more temperature sensitive, so you can take advantage of that to figure out whether they are germanium or silicon. First, put the diode in the tester, and wait a minute for the heat of your fingers to dissipate and the diode to return to ambient temperature. Test the diode and...

Nice build! It’s one of my favorite fuzzes. Have you tried flipping Q2 (emitter to ground, collector to Mood)?

In no particular order— Terraform (Latent Lemon Hurts-style Harmonic Percolator) Sungrazer (Monolith Oracle) Trumpet Fuzz (Paul Trombetta Rotobone) Monolith (Mountainking Megalith ) Fuzz Standard (Ibanez Standard Fuzz)

The MP39B should work, at least on paper. I prefer transistors with an hFE in the 30-50 range (as measured on a DCA55) and as low leakage as possible for Q1 in the Harmonic Percolator.

I've build several Tone Bender Mk. III x Big Muff circuits, and this one might be my favorite. You should build one if you haven't already—grab a Scythe and get started. Compared with the Yellow Hybrid Tone Bender and the Colorsound Supa Tone Bender, the Tone Reaper has more Tone Bender Mk. III...

You could also have a switch that connects/disconnects Q5's connector from the rest of the circuit. One of the contemporary Super Fuzz clones uses that approach, but I don't remember off the top of my head which one. I think Q6 had an hFE around 130. I tried some lower and higher gain ones, but...