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How about replacing 750r resistor with a 1K trim pot and setting the value by ear or eye/nose as components release their mojo when accidentally shorting something with a flathead screwdriver.

Have you double checked your transistor CBE orientation is correct to the schem? Have you tried adjusting emitter/collector resistor values for correct bias or tried completely different transistor?

Old content, but better to gather this one here too before parting ways with it. Too bad I didn’t drill led holes big enough to fit those leds in first place. Fuzz’n’Burn p2p Isolated jacks, bus star grounding, trims for transistor bias on electra and meathead sides and enclosure shielding...

I tried to solve this with 3PDT, but couldn’t figure it out. I think it needs to be 4PDT to make this work. I’ll post my sketch soon. Edit. Guess this will work? CLR 3.3-5 kOhm

I tried to think what a diode would do, but cannot make any proper statements with current level of knowledge. But if you combine 100r resistor HamishR suggested and 100nF cap from me you get this: Lowpass filter on DC and cutoff frequency at ~15.9kHz.

One thing I’ve picked reading this board and for you to try too is adding a 100nF cap (ceramic/plastic) from power jack socket positive connector to pedal housing with leads as short as possible. Best to ensure secure connection with bolt and lock washer. My OneSpot whines more than cheap...

I was suspecting IC1/2 function correctly, but thanks for validating it! Too bad I mostly have variety in single OPAs, but lack on duals. I just changed IC1 back to TL072 before todays rehearsal as I need those high freqs to achieve some real diversity on my pedal board.

Guess it’s time to start a build thread I’ll be updating with new builds worth mentioning. So let’s get it on. GCI Brutalist Jr I had a need for a distortion and Brutalist was suggested for me. I don’t like waiting and paying postage for a PCB or two so stripboard was a natural choice even...

Same has happened to me and luckily I noticed it before socketing those sensitive programmed ICs in the build. Good reminder to always check sockets with DMM before going further and double check pin orientation on transistors from datasheet and with a tester.

@hereonmars any update how troubleshooting went and did you find out what was the cause of excessive humming?

How about storing resistors in a humidifier box and curing ’em @ 45% humidity to get those blazing overtones?

Okay, I got motivated ’cos my build whines and squeals with guitar volume down. So here is my first schematic traced from a vero layout. Edit. Rehousing and wire placement tamed squealing completely.

Blackhawk amplifiers Morgul boost is usable if you want drive your preamp to oblivion. Bit noisy, but gives nice grit. Dirtboxlayouts has vero layout for it, but unfortanely no schematic there. I’d like draw it, but haven’t yet been motivated for it. Just remember 20-50pf compensation cap for...

Ok doomer! 🤘 Yesterday I gave more playing to the circuit and it was good now and I was happy with it, especially when compared side to side with meathead with Si transistors. I’d suggest Ge-Megalith gives nicer fuzz than Si-Meathead, but there’s also different values on circuit blocks, so...

http://www.muzique.com/lab/buffers.htm

I did some circuit tweaking. Changed Q2e 10Kohm resistor to 10k trimmer pot and Q2c voltages dropped instantly to 3.8Vdc. Slight adjustment and I was in typical FF measurements with collector voltage set to 4.7Vdc. Gave it a test with my bedroom amp and sputteriness had disappeared, but also...

Maybe this fits here better than in General questions section. So I have a question for those who have built Arkaim and measured it with DMM. Most of the older threads about this circuit circulate around hefes, but those have saddly no use for my request. Circuit is tweaked FF with boost. I’m...

What’s the amp you have?

There’s really good info shared here, but I’m still strongly suggesting excluding preamp tube problems before going inside amp chassis, shielding guitar, suspecting household AC problems etc. So did you already check does hum disappear when removing preamp tubes one at the time? Remove input...

Yup, preamp tubes for sure if the hum appears when turning more gain/volume up with nothing in input. No need to bias. I made a long trip on doing several things before realizing I had two bad preamp tubes in my tube collection which I thought are good. Also isolating problem to the preamp side...