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In Reply to: RE: Tube amplifier hum posted by email@example.com on May 19, 2017 at 13:23:19
It's a grounding issue or a grounding loop. I have to figure out what is grounding, or not grounding?
Unplug the whole thing and just setup the tube amp. See if there is any hum. post your findings.
Thanks... so I took the amp out of the room, plugged it in in another part of the house, no interconnects connections, and plugged in the phones.
Definitely a pronounced hum.
Ok, check for loose pin connections.
Gently wiggle each tube and see if the hum worsens or goes away.
BTW what unit and tubes are we talking about?
How old are the tubes and do you have a replacement set to test with?
When was the last time you cleaned the pins?
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