Germanium Transistors for a Fuzz Factory (ish) clone

Frequently asked question on transistors: types, substitutions, how to test, use and misuse them.
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harry haggis
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Joined: 16 Nov 2011, 23:23

Post by harry haggis »

Hi,

I'm going to make a Fuzz factory type clone for my first pedal build just because I think it's interesting and fun and well. Cheaper. I'm using the parts list here:
http://diy.musikding.de/images/stories/ ... ybomen.pdf

But I've managed to find some of the capacitors etc and the enclosure a bit cheaper so I'm only going to be ordering the PCB and some other parts from their site directly! I'm just a bit confused about the two Germanium transistors:

Q2 AC122/AC128 60-90
Q3 AC122/AC128 110-140

I understand they come in different values like 90-100 110-120 etc.. but I'm not sure what difference they make? The logical side of my is thinking I should split the difference and order 70-80 and 120-130.. but I have no idea what bearing on the pedals function/sound these make?

What reasons are there for chosing different values etc?

Thanks

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