... Next is taking amps to test at my office.
I think that will reveal the amps are the source of your problem.
Hum on Tube Amp - Can't find source
I have a hum (60hz) I can hear on my speakers and it happens with my tube monoblocks (either of them). With or without interconnects, it even happens on either amp (have tried one at a time) with every circuit on the house tripped/disconnected, every other component disconnected from the wall (including the Internet/CaTV line) and no interconnects.
One amp has it as soon as it warms up whereas the other one is intermittent.
Hum X doesn't solve it, iFi Ground defender either, AVA HumDinger on powerline doesn't solve it either.
I have replaced the tubes and both amps were just tested at the factory. Replaced the circuit breaker, tightened every wire on the breaker box, checked and cleaned all connections to ground rod. Added a hum eliminator to the internet line.
Hum cycles a bit with the tube glow matching the cycles.
I'm waiting on the power company to come check the power coming to the house.
Thoughts?
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- 145 posts total
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@ervikingo I had assumed that since your amps were 'tested at the factory' that they had a clean bill of health. But the first rule of troubleshooting is 'don't make assumptions'. Occam's Razor is always trying to get me to look at the simpler explanation, and @redhouse6 's comment about the filter caps is a very good one! A lot simpler than most the other explanations here, including my own. So how old are your amps?
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The responses I read all seem helpful. I had a LF hum that drove me crazy. Don't know if this is relevant to your situation, but mine was caused by interference from my wireless router that was close to my equipment stack. The router was at the same level as my TT and the interference was picked up by my Lyra Kleos cartridge. I relocated the router to a lower height and across the room and it was gone. Go figure |
- 145 posts total