It says to be traced from a tube driver of which the original serial number and PCB number are given. On the contrary, the third schematic (which is very new) contains various differences with the first two, even if the basic layout is the same. I suppose John Greene's schematic is the one used by the majority of the ones who have already built this pedal. The only difference between the first two is the value of two caps in the tone stack (0.47u each in the GGG schematic, 0.047u each in John Greene's), which may be a typing error in one of the two (in any case, which value is correct?). I found one at General Guitar Gadgets ( ), one from John Greene at and one at. I'm planning to build a Chandler Tube Driver and I found three schematics.
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