I have an Audio Note preamp kit, M7 variant, that operated quietly at my old house. After a move it has developed an impressive hum. The overload indicators on my ss amp light up with no signal.
I have checked wiring and can find no grounding issues. I have put shorting plugs on all unused inputs and that seems to help (but not cure) the hum. While the audible hum drops with the shorting plugs, the power amp overload lights remain on making me think something sub-sonic is going on..
While the obvious culprit is a ground loop, I haven't been able to chase it down. This is my first piece of gear with tube rectification so I wondered... could what I'm experiencing be explained by a failing rectifier? What would that sound like?
Any thoughts would be greatly appreciated.
Cheers...TG
I have checked wiring and can find no grounding issues. I have put shorting plugs on all unused inputs and that seems to help (but not cure) the hum. While the audible hum drops with the shorting plugs, the power amp overload lights remain on making me think something sub-sonic is going on..
While the obvious culprit is a ground loop, I haven't been able to chase it down. This is my first piece of gear with tube rectification so I wondered... could what I'm experiencing be explained by a failing rectifier? What would that sound like?
Any thoughts would be greatly appreciated.
Cheers...TG