Please take a look at my next planned project and see if you can spot any mistakes I might have made, or I could still avoid making. Also please let me share in any wisdom you might have into building these pedals, as this will be a first for me. I finally got around to testing some of the boxful of Germanium transistors we found in my son flat when he moved in, having first made a suitable tester like R.G.Keen suggests. Turns out I have three sets of ACxxx OCxx of suitable gain and emitter leakage of 0.09mA or better, to make three each of Fuzz Face and Rangemaster design. So I thought why not bang them in the same box, I'm sure it has been done often enough before now....but the only schematics I could find where the two are together, and combinable, seems to be the SUNLION, but that gives one the choice of FF alone, or FF running into a RM, but not the RM alone, which is what I was looking for. General view seems to be that putting the RM in-front of the FF makes little sense. I've drawn up a schematic that has a bypass/engage footswitch. A rotary switch to; 1. disconnect battery (so that the pedal can be left on a boars without unplugging jacks) 2. connect battery, and have FF or RM 3. connect battery, and have FF into RM A second footswitch that changes the options set by position 2 & 3 above. I've also made a few changes minor from the originals, not too much, and nothing too original, all is well covered in most discussions about these pedals. I decided to add LED channel indicators to the schematic, but may change my mind about that, I power the RM LED from the FF battery to keep it out of the circuit when just the RM is engaged, and the other way around for the FF. When both are on, then the shared resistor should drop them down to negligible power draw.