I have a tons of USSR germanium transistors that needs a new home and I'm trying new ways to use them since it gets a boring after while to just use them in Fuzz Faces and Buzzarounds. This one is a mix of ZVex Box of Rock and the biasing technique that RnFR (of Apocalypse Audio) is using in his designs that using germanium transistors.
Cap values is almost stock Box of Rock with three cascaded germanium boosters with the addition of a "Boost switch" which adds a 2,2nF cap in paralell with the 470pF/470K RC filter between the first and second gain stage.
I ended up with three MP21E transistors in the 60-70 Hfe range but other part numbers sounds great too, just be sure to use transistors with none to very low leakage.
It definetely sounds like a "Brown sound in a Box" pedal, a bit darker and it has a slight "Lo Fi nature" to it. And with the Boost switch on and the gain control dimed you get a really thick fuzz out of it.