RunOffGroove Fetzer Valve Revisited. This circuit aims to emulate 12AX7 triode stage in Fender amps. It uses a J201 N channel J-FET. Carefully biased, it works pretty well, you get a neat, loud and full of harmonics sound, with a lot of gain (depends on the J201, it's better to sort and measure them with...
Bypass based on a DPDT footswitch for guitar effects. LED lites when effect is activated.
BI means BOARD IN = effect board input
BO means BOARD OUT = effect board output
JACK IN (JI) and OUT (JO) are the input and output of the effect pedal.
Original schematic : http://foro.cuartitodiyer.com/viewtopic.php?f=5&t=5915
DPDT is manufactured by ALPHA (https://mybigsound.com/en/switches/55-footswit...