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?
@atmasphere being a guy in the land of 10k lakes, motor boating should be natural. 😎 (but it’s probably ice fishing season now,) I was pretty sure that the hum reducer gear, and power conditioning approach, was not likely to lead to a solution… and the amps not having RCAs hooked up precluded a ground loop being possible. And some version of an Ishikawa chart would have been helpful here.
In any case… it is a great outcome for the OP, and should be useful for others. |
My understanding is the two happiest days in the life of a boat owner is the day he buys it and the day he actually is able to sell it. I find bicycles are much easier to manage except for that N+1 thing (N= the number of bikes needed). |
@atmasphere yeah… shopping for a gravel/adventure one now. |
@ervikingo Hope your hum is still a non-issue. I'm anxiously awaiting the delivery of my first tube monoblock amps. I had a hum issue with my solid state amps, even with all new electric dedicated 20amp lines and audio grade outlets. Thank god a single humX fixed the issue, but I'm kinda nervous about my new amps since I won't be using dedicated and newly run outlets. I'm probably gonna have new 20amp lines run with audio grade outlets placed once I know where I'm gonna have my amps set up more permanently, but just kinda nervous. Well see... I'm also probably gonna ask the dealer I bought my amps through to lone me a puritan 156 with ultimate cable to A/B things should there be an issue. |
