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Okay, I tried swapping out all of the preamp tubes, one at a time.
No joy...
I'm about 99.999% positive that it's not a microphonic preamp tube causing the feedback.
So, I pulled out the reverb tank...
...but I didn't see any obvious problem with the tank, like a loose wire, broken spring, or whatever. So I cleaned the RCA connectors where the cable goes into the tank, then put it back in the amp.
I still have nasty feedback when the reverb is turned up.
Could the reverb transformer be causing the feedback? Is there some way to test it to see if it's within specs?