The Karl is essentially a modified Tim Escobedo Tripple Fuzz, basing it’s sound around an NPN/PNP transistor network known as a “non-selective frequency tripler.” I modified the power section a little bit. The original has an unnecessary 47µ cap at 9v input before the 330Ω resistor which I eliminated. I also moved the anti-popping pull down resistor to before the Intensity pot (the original had it after) and it might not even be necessary at all. But better safe than sorry.
