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Did you have any normal sound in addition to the slight noise/pops? How did you know the OT was reversed polarity? Noise (hum/hiss) and popping is not a symptom of this.
Oscillation you will recognize the second you flip on the standby... there will be LOUD squealing - even with the volume rolled off.
If its not a LOUD squeal, but more a hum with no guitar sounds coming through - I'd bet your either:
1. Missing a ground (you forgot to ground something).
OR
2. Something is accidentally grounding out (a wire/component may be touching the chassis or a ground lug).
IF IT SOUNDS LIKE A NORMAL AMP, EXCEPT FOR THE HUM/HISS/POPS TRY:
1. I'd check all solders and make sure they're all shiney and not dull gray.
2. I'd check your RCA/Reverb section. Make sure its grounded well.
3. Try a few different 12AX7's in the first slot.
Otherwise... is the amp getting any guitar sounds through it at all?
We need a little more info on what the problem is.
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