Fuzz Face piggy backed version, as described here : http://tagboardeffects.blogspot.com/2012/06/npn-silicon-fuzz-face-germanium.html
Each pair of transistors has 2 resistors in parallel to set their gain precisely.
I suggest to breadboard your transistors with a trimmer to find out resistors values for the desired gain.
Great sounding fuzz face, low noise and very close to the best sounding Ge fuz...
fuzz tonebender vox clone with charger pump. Pedal can be powered by external power supply and can be used in chain effect. typical gain for OC75 transistor are 70 hfe for Q1, Q2 and 100 for Q3. Great thank to fuzz central website and his remarkable job. http://fuzzcentral.ssguitar.com/index.php.