04-03-2017, 04:59 PM
I pulled apart the transformer and it looks like it got really hot at some point and has a burnt smell when you sniff close to the paper insulation. I found a used one, same part number, that looks much better with no charred spots or dripping wax. I repaired the wiring and with no load all of the windings read the correct voltages. But I did notice that after about 100 vac on the variac the primary ac current starts to bump up a bit and settles at about 160 ma. With no load I thought that I wouldn't see much if any current draw from the trans. Does anyone know if this is normal or maybe an indication of shorted turns? Like I said, all of the voltages are right on target and I'm not measuring any leakage from the windings to the frame.
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Dave Thomas
Coatesville, PA