The FF circuit is rather simple, seems like pretty simple stuff, and in principle it is, but there is plenty of black magic and mystery associated with a good sounding Fuzz circuit, and it takes a lot of effort to get the things sounding just right.
The gain (Hfe) and leakage current inconsistency of the germanium transistors (the sound signature of this pedal) and the lack of ability/will to use the right components could make a huge impact on the tonal heart. The circuit layout in a pedal with a huge gain like this is critical and the component selection will leave its footprint on the sound.
In this project, we are going to build the best Fuzz with all the knowledge and experience that we have nowadays while keeping the tweaks and character that make this vintage pedal to sound warm, round, and harmonically pleasant.
All the info at www.electrosmash.com/germanium-fuzz
You can always contact us at firstname.lastname@example.org