Question about late 60s boutique fuzz from GGG

[Atodovax]

Hello everyone , i have a question. I just bought the continental pair of NPN ge transistors from small bear electronics and assembled the late 60s fuzz. I dont know ig this transistors were intended for this model as the layout shows more resistors than four . It brought 4 carbon resistors testes for the optimal performance. Do you know the voltages that i should read on both Qs? And also.. Is there a way to turn this circuit into an original 2 potentiometer fuzz pedal? Like the one hendrix used?. Im not sure which clone is this one, but i would like to get the hendrix tone and the only fuzz face using germanium NPNs that i found was rhis one. I dont want positive ground FF or negative fround using PNPs. Thank you very much!!

[idy]

Get rid of the misleadingly named "bias" pot which is better called an input pad or guitar volume knob simulator. Replace the "contour" pot with a fixed resistor or interior trimmer set to taste. Viola. Look at the many schematics for fuZ faces.
Use the search function to harvest opinions on best voltages for transistors... you have a trimmer on q 2, that ( with the "contour")should let you do it by ear to taste!

[Atodovax]

Thank you very much! Most of the voltages seem right ... Only base of both Qs are too low... Any idea on how to fix that?

[idy]

What are the voltages? Is it working? Does it sound fuzzy?

[Atodovax]

It does work. Q1 is 0.09 base 0E and 0.5C and Q2 is 4,5v 0.5 and 0.4

[PRR]

> 0.09 base

That is "wrong" for Silicon but typical for Germanium.

> Q2 is 4,5v 0.5 and 0.4

I assume the 4.5 is Collector? Then that's right; else wrong.

[JustinFun]

Get rid of the misleadingly named "bias" pot which is better called an input pad or guitar volume knob simulator.

It's not really either of those - it's not tied to ground, just operating as a variable resistor. I really like this mod myself, it's different to just backing off the guitar volume. When i build fuzz faces I usually hard wire the fuzz pot on full, and use a 100k pot (not 50k) on the input as a more useful gain control.

[thermionix]

^ Mine is done like that too, but I started with B100k and switched to B50k, after finding I was only using half the pot.  But I don't use it as a gain control, just as way to enable occasionally running another pedal in front of the fuzz.  Normally though, it's all the way down to zero, essentially out of the circuit.

[Atodovax]

This is the sound of the fuzz face cranked all the way up, Contour at 12. Guitar is gibson sg , amp is Soldano Slo50 clone (not very vintage i know ).
Do you think is it ok?
https://youtu.be/-PcvWdkGpZ8