Opened up my amp to find 2 relatively new screen grid resistors completely blown. The tubes are also recent. Playing loud punk music in various diy spaces with sus power outlets may be the cause? Replaced the 470 ohm resistors (teal) but also the 22uf 63v bias supply filter cap (blue) and the 82k and 100k plate load resistors (yellow) on the phase inverter tube. We'll see how how it is after tomorrow's gig.
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