I am working on a pretty standard set here. After a few easy restorations like this one, its a stumper. I had an open audio output transformer in a 40-195 once, which was obviously easy to pinpoint but that set used a larger trans and the more powerful push pull 42s . This set uses 41s and has very low audio output, hardly normal for these.
A check of DC voltages on both 41 output tubes is normal and seem to correspond with the values in the tube manual. The bias is correct and 7C6 1st audio scopes out fine for signal voltage gain.
What I dont understand is that, while I have 203 volts on both the screen grid G2s and 190 volts on the plates, the
original 32-8120 output transformer primary measures 2250 and 1280 ohms DC resistance
when the schematic indicates 190 and 170 ohms! The speaker field coil is right on at 1090 ohms, so what is up here?
Wouldn't a transformer fail mean its shorted or open? Can it be partially open?