![]() To explain what it actually does, it supplies one half of the power amp with a signal & the other half of the power amp with a signal that is 180 degrees out of phase. Hi Chilli, the PI tube is the Phase Inverter tube (aka Phase Splitter, aka power amp driver tube). I need to dig up a good layout chart of the ST1 printed circuit board to figure out which resiters I should be checking next. With my 50 watt Master volume JMP, does the 7.2 volts still hold true? Is 5 volts good enough, or should I check every last 12ax7 I have to make sure I can't get closer (I probably will anyway)? Except one, where pin 1 only had 58 volts (most likely nfg). Most were 15-20 volts off, varying from 190 volts to 230 volts. ![]() I tried several 12ax7 tubes in V3, and the best I could get was 5 volts difference. ![]() I copied the bottom section from the messages going around when Chilli got his Marshall Lead Bass head.
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