The last Fuzz Face transistor set I acquired was from Small bear- and I think they sound great! But I came across this that states "four parameters which are critical for the best sounding fuzz" are measured." Actually, this is from Analogman's site. I can think of testing for hfe and leakage, but what else is there to check for?
Colour and pin length? ;D
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Jimbo
freq response and noise/hiss most likely.
mac