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I checked into the wiring around the plug and the transformer, but I could find nothing. My switch, however, does seem to be very "iffy." Testing for continuity, I found that it does switch on most of the time, but several times it fails and nothing happens. Even the way the switch "clicks" doesn't feel right at times.
I found a bad ground that had come loose, repaired it, and the "putt-putt" sound went away completely. I'm still getting static in all modes of operation, but the static is smoother and more consistent. With the volume control, I can only make the static loud, or practically non-existent. I can't vary the volume of the static with the volume control. It just simply isn't there with the volume down, then at about 1/3 turn it pops in, stays there until the last 3/4, and goes away. With volume turned max, the set is quiet.
I do get plenty of buzz from probing around the volume control and the 6SQ7. From left to right, looking at the pot from the bottom, there's a green wire, a black wire, and a bare wire with a 30k resistor which runs to the 6J5 2nd audio. I get the loud buzz from the green one, which goes to the 6SQ7, pin 2.
I'm a bit concerned about the popping, plinking sounds I've heard from my transformer. When I turned it on again today, I heard the same popping sounds I heard last night. They go away quickly, but since I can find nothing else at fault, it makes me worry that the transformer is suffering from internal shorts as a result of it's overheating in the past. I do have a replacement in mind... but I'm a bit fuzzy on how to replace it... but that's another story.
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