will
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Hey Other Lon,
Sounds mysterious. When this happens here, I often start with the IC connections, but I have low some mass WBT RCAs jacks where the ground runs a spiral up the sides, and with low mass KLE RCAs on the ICs with a relatively small one sided ground connection. Sometimes I lose a good ground and get hum, turn the IC ends a bit, and that can fix it. But you had disconnected ICs, so I would have thought tubes too. Guessing you swapped all the tubes, including Rectifiers and VRs left to right. That being the case the only thing I can think of besides something internal, is possibly a slightly loose tube socket connection somewhere, and maybe the cryotone tubes have a little bigger pins, or just made connection better for some reason, or by chance??? Hum can be a real drag I know! Glad you got it solved.
No expert, but my experience.
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