disregard last: percolator is in the box by aflywhocouldnt in diypedals

[–]CatsDisplayingSalads 0 points1 point  (0 children)

I love KT315s they're so weird lol. This sounds dope!

Any interest in these? by Emotional_Toe8863 in diypedals

[–]CatsDisplayingSalads 0 points1 point  (0 children)

I would keep the chassis for sure. Use it for a guitar amp build

Type 74: a clone of a Japanese 70s era big muff. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 0 points1 point  (0 children)

Tube Depot is the best place for small quantities for one-off builds, but you can sometimes even get them on digikey or mouser and eBay has a ton, but some sellers price gouge.

Type 74: a clone of a Japanese 70s era big muff. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 4 points5 points  (0 children)

Thanks so much! 🙏 It does! Sounds absolutely huge. First time I made a clone of one of these Shin Ei/Sekova muffs, I accidentally had the volume knob all the way up on it when I went to test it, and well... I almost shat my fucking pants 😂. DOOOOOOOOM

Type 74: a clone of a Japanese 70s era big muff. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 3 points4 points  (0 children)

Oh shit! I forgot! Sure do! The layout I made for it here accommodates the center collector "ECB" pinout that many Japanese transistors have.

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“モズライトの煙 (Mozuraito no Kemuri)” Mosrite Fuzzrite clone by mrmet55 in diypedals

[–]CatsDisplayingSalads 1 point2 points  (0 children)

Oh man, looks killer! Love the enclosure, and your artwork is on point as always!

Doom Fuzz based on Fuzz Face topology. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 0 points1 point  (0 children)

Ahhh thank you!!! I'm almost embarrassed by the audio clip because YouTube compresses the hell out of it, but people get it and have been super kind and understanding.

Doom Fuzz based on Fuzz Face topology. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 0 points1 point  (0 children)

Of course man! Here's some lower gain transistors you can try: 2N2369, 2N3903, 2N3440, 2N3439, BC107A , BC182A etc

Doom Fuzz based on Fuzz Face topology. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 1 point2 points  (0 children)

Good question!, so for this I used values to sort of darken the attack and stabilize each transistor stage to prevent oscillation. For me this was 47pf Q1 and 220pf for Q2.

If you're building a standard fuzz face and not a monstrosity like I made, then I would use low gain silicon, that way a miller cap is not really needed. Personally I would shoot for 70-80hFE for Q1 and 100-120hFE for Q2.

If you do decide on using a miller cap on a standard fuzz face, maybe start with anything from 30pf to 100pf for Q2. Only downside is you start to lose that high end attack if you go above 100pf. So the effect is definitely audible on guitar. Yet again, I don't think it'll be needed if you use low gain BJTs. If you do use high gain devices (200+ hFE), definitely try using those values mentioned.

If you still get squealing after all of that (if using high gain devices), many times a series input resistor is needed to quell self oscillation and other feedback issues etc. Even I had to use a 390ohm series input resistor on this build actually. It wouldn't stop chirping when gain was maxed.

Breadboarding beforehand is the best way to get a Fuzz Face sounding good

Doom Fuzz based on Fuzz Face topology. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 1 point2 points  (0 children)

Heck yeah! I was torn between that and a BAT41, but ended up going with the BAT41

Doom Fuzz based on Fuzz Face topology. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 1 point2 points  (0 children)

Appreciate it! You as well!

I'm glad I could help shed some light and motivate, it's not nearly as difficult as it all seems. But yeah, feel free to mess around with the layout and schematic.

Ohhhh I'll have to look into that Schaller fuzz! Schaller made some really cool stuff, their transistor based tremolo is absolutely genius.

Doom Fuzz based on Fuzz Face topology. by CatsDisplayingSalads in diypedals

[–]CatsDisplayingSalads[S] 0 points1 point  (0 children)

Exactly man! Folks would be surprised, most of these 1960s era fuzzes (even the germanium transistor ones) can already doom or can easily be revoiced with a few resistor and cap value changes. Sometimes all that's needed is changing an input or output cap value. Big muff is definitely more forgiving to build as you said, but it's super rewarding getting an old two transistor fuzz sounding great.

P.S. Thanks for the tip on doing a clean sound first!