P1eX Based Amp
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My main amp for a number of years was built following the P1 eXtreme schematic from AX84. I tried a bunch of power tubes and found my favorite was a Svetlana (I think now they're SED Winged C) EL 34. Although the amp sounds great cranked up and overdriving the preamp and pushing the power amp, for the worship band I installed a switchable cathode resistor to reduce gain and I typically run the amp clean (though on the edge of breakup) and use my pedal board to generate the distortion.

Sadly, although I built a nice cabinet for it, I never did the faceplate. It is on the To Do List!