A really good sounding fuzz found in old soviet Borisov Formanta guitars. Added a pre gain control in front and a cap blend for the body control in the tonestack. I also tweaked collector resistor of connecting Q2 to 8,2k. Sounds loud, gnarly and heavy.
Original has KT315B transistors but 2N2222A, 2N3904 and BC107 works really good in there too, just mind the pinout.