I've had a Farnsworth CC-70 on the bench for a little while, dead set. Tubes light, never any sound. Tonight I just discovered the audio-out transformer has an open primary. Schematic snippet attached:
The field coil is ok and ohms out to 1600 just as the schematic says. Unfortunately the schematic says nothing about the DC resistance of the output transformer. The old one is infinity primary, and maybe 1/2 an ohm secondary. Neither one sounds plausible.
Any idea what the readings should be?
If I replace the transformer, should I worry about blowing it too? Is this common? What precautions should be taken.
And trivia-related, in the schematic I see the secondary driving 2 coils, labeled "VC" and "BC". I can guess VC is Voice Coil. I can't guess the other. Anyone?
Thanks!