01-31-2013, 01:06 PM
To clarify, There could be a few things wrong with the output transformer which will not shut it down entirely, if you have ruled everything else out. You can emulate single ended operation by removing one of the output tubes, and then replacing it and removing the other one. Should get some hum, but a remarkable difference in volume using one leg or the other of the primary may indicate a problem with the transformer. Differential diagnosis by swapping the output around , (do the test twice,) just to eliminate a possible point of failure.
Next:
Agree, sub another PP transformer and speaker, keep volume pretty low, and see what happens. Just about any tube era transformer of the same "weight" will work reasonably well, in fact probably good enough as replacement. For a radio, just not all that critical, and there are always remedies to adjust bias, etc... to make everything happy, safe, and long lived.
Next:
Sometimes connections in transformers become corroded or arc, and sometimes you can fix by disassembly and whatever. When you have a basket case, there is little to lose.
Well, let us know
Next:
Agree, sub another PP transformer and speaker, keep volume pretty low, and see what happens. Just about any tube era transformer of the same "weight" will work reasonably well, in fact probably good enough as replacement. For a radio, just not all that critical, and there are always remedies to adjust bias, etc... to make everything happy, safe, and long lived.
Next:
Sometimes connections in transformers become corroded or arc, and sometimes you can fix by disassembly and whatever. When you have a basket case, there is little to lose.
Well, let us know
