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after many hours tweaking my truebypassed vox 847 my preferred settings are...

input resister - 100k
frequency cap - .009uf mojo cap
q resister - 40k
midrange resister - 1k
gain resister - 1.2ohms !
inductor - fasel yellow.
transistors - bc550

the gain resister (actually a trimpot) is way low but it needs to be to compensate for the higher input resister.
Last edited by mildew at Aug 5, 2015,
current wah mod state is this.

input resister 220k

bass resister 1k

q resister 68k

gain resister back to 470ohms

pitch cap .009uf mojocap

added a stripboard SHO booster on output side.
Last edited by mildew at Sep 7, 2015,