Gnat Fuzz

[Jovi Bon Kenobi]

I'm going to go in blind with this since the build docs aren't up yet but I had a couple questions...

First question, the silkscreen has an unlabeled diode. What works in this spot?

And second, are Q1, Q2, and Q3 left to right?

Gnat Fuzz URL

 

[Nostradoomus]

Any GE Diode should work. And yes it looks like left to right Q1-3, that’s a safe bet. Aim for 60ish HFE for Q1, 80ish for Q2 and 120+ for Q3....buzzarounds rip!

 

[Jovi Bon Kenobi]

Great thanks! Those are the hfe values I have so hope I don't fudge it up ?

 

[Robert]

I'm going to go in blind with this since the build docs aren't up yet but I had a couple questions..

Don't do it blind, you'll go .. uhh... blind? ...

https://docs.pedalpcb.com/project/Gnat.pdf

 

[Jovi Bon Kenobi]

Don't do it blind, you'll go .. uhh... blind? ...

https://docs.pedalpcb.com/project/Gnat.pdf

Haha. You da man ?

 

[Chuck D. Bones]

You can buy D9E Russian germanium diodes here. They are (allegedly) very similar in performance to 1N34A. I bought a few here, but have not installed them in anything yet.

 

[Nostradoomus]

My hfe suggestions made it into the build doc! Now I am legend.

 

[Jovi Bon Kenobi]

You can buy D9E Russian germanium diodes here. They are (allegedly) very similar in performance to 1N34A. I bought a few here, but have not installed them in anything yet.

Cool. I have no 1n34a's but a bunch of subs...D9K, D9E, G223, and AAP153.

 

[Chuck D. Bones]

Buzzaround, Tonebender & their derivatives (Reaper) depend on leakage biasing for Q3. I built a PNP version of the Reaper and found that different transistors sound markedly different. You'll know the right one when you hear it. Not enough leakage and it gets too sputtery.

 

[Nostradoomus]

Yeah lots of PNP old school fuzzes are very transistor spec dependant...it adds to the lustre! (Frustration?)

 

[Jovi Bon Kenobi]

Well, it's all built. I'll post a build report soonish. And it does indeed RIIIP! Wow, it's frippin' amazing! I got the matched PNP generic set from Smallbear. HFE's were 66, 77, and 107.