here is a print, still need wire ga will measure today,
weird structure, HT wind starts with the CT, ends at the plate terminal, then we start with the other plate terminal and finish with the CT which gets spliced to the first CT start, buries the hot ends, maybe done to limit radiation into audio, nice, but you have to watch insl as you have 780 VAC right next to each other,
heater winds on top of everything, risky business as pressure can damage small sec wire underneath which is probably what happened to this guy, oh yeah, PRR says bigger radius = easier winding,
notice Ampeg says 117 pri on orig schematics, so 390 VAC becomes 400 at today's 120 VAC pwr line,
10 volt increase which means 14 volts extra plate voltage after filtering, if you already run tube at the limit then you risk failure as 470 becomes 484 volts plate
so we can wind 1007 turns on each sec instead of 1033 to compensate, or lower if we want a solid state bridge,
pri wire is heavy, only 2.3 ohms, good deal, steel is barn roof .018, so low Henries, means we have maybe 30 ma excitation current plus tube power,
nice powder coat can with this xfmr,