marshall jtm-30


Gold Supporting Member
I never took pictures of the whole board when I had mine. Tubesandmore has the wiring diagram for the transformers on their site if that helps.

I do have close up images of a distortion diode bypass mod on the boost channel, and the addition of a variable resistor in the zener diode array (to lower the bias). If that's at all helpful I'd be happy to pm them.

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