First time posting, I’ve got a drip-edge Bandmaster and did some work on it (New tubes, all new electro caps, Added master volume, replaced some resistors, etc.). Everything worked fine and I went to make my measurements to bias, then turned off the amp to measure plate resistance and...
When I turned it back on no sound came out. The tubes glow but the OT center tap and DC voltages are now *negative*. -.433v. The tubes don’t get hot. I’m thinking a blown transformer, but I would like to know if this is a simpler problem first before pulling things out.
]I’ve switched tubes, speaker wires and cabs, guitars and cables, scanned/shaken inside, all to no avail. Any help here would be greatly appreciated and I can do more measurements if needed.