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Howdy, Thought I'd document some of a build I'm doing here in case anybody is interested in how you approach making custom boards/etc for an amp. I've got a stack of submini tubes, and a guy has been harassing me about making him a mini Trainwreck-inspired head for a while. Decided to see what...

Idles at 300v with ~6w or so of draw

G'day, Uploaded all my Kicad libraries into a .rar file - there's symbols linked to footprints linked to 3D models for just about everything you could ever need to build a pedal or amp. All basic parts have suitable fab house/CNC option for footprints, and have a much wider range of stuff than...

Make the 10k resistor to the power rail a 50k trimpot. Pro tip: you can also add a 1k pot between the power rail and the emitter of Q3 and you've got a nice little octave control pot.

It does, but it also forms a RC filter with adjacent components

These are all from memory, so please consult the board/schematic before trusting anything I say. Remove the cap connected to the AC output to isolate it (should be C2, 22nf ceramic) Bridge B/C pads Drill a small hole in the D pad Connect C2 + 1/2w 470k resistor between B/D (massive noise...

https://a.aliexpress.com/_mKX6pn1 With a little bit of finagling (and some much needed safety features added) these are a very compact, shockingly quiet HV supply for running tube preamps (and even power amps up to about 5w). I've been running them for a few years with zero failures

More signal out, which can change harmonics slightly as well as interact with any additional drive stages differently. We're talking like 0.2-0.3v of difference minimum needed before you'll notice anything, and even then having diodes with a different Fv knee is likely to make more of a...

You will not hear one iota of difference whatsoever. Use whatever looks coolest ;)

All done!

They are fully interchangeable. Your issue is elsewhere in the circuit

Alright, TIL about input/output compensation networks. Output was easy - a small value cap from pin 5 to out. Tried a few values while I had a sig gen/scope on, and about 47pf everything seemed to come good - about 3x the output and much less noise than without it. For the input, most examples...

After much messing around, I'm almost at the end of this one. Cliffs: Distortion+ish with NOS almost Soviet parts (all components from Tesla in the early 90's except for diodes which are D18 germaniums). Component values based around what I could get in suitable parts - different min/max...

Absolutely not lol

Well that makes a lot more sense - I've never seen anybody include the switch to short out the diodes! I've seen years of people stating including it (sans switch) lead to tonal differences that only they could hear, and used you as their evidence for it :LOL:

Basically nothing, unless your name rhymes with Saul Lochran

I may have cooked a little with this one. CD4049 charge pump, giving me about 58v from a 12v supply. Will probably run it off 9v as...well, you'll see. Less than 10mv of ripple while running it at 60khz; I did try getting to about 100khz, but the oscillator isn't as stable. Originally...

Anybody who claims they can hear a difference between carbon and metal film resistors (of the same value) is, at worst, a liar. Most of the mystique around vintage parts is most have massive tolerances, so an amp that sounds particularly good is likely caused by values being different from what...

What are you testing with?

A majority of analog pedals will draw 5-30ma, with a fair chunk of that normally being in the LED. https://stinkfoot.se/power-list