[esus1]

This is my first year of owning the Khartago mono amps. They have been great. I recently noticed that one of them has a hum that is coming from the speaker. No matter where I plug (AC) the symptom does not change. The other identical mono amp has no noise when plugged into the exact same outlet. The preamp feeding them is a Schiit Saga and it is  turned off.
Any ideas on what this may be?

All thoughts are appreciated.

[Speedskater]

Did you try using other interconnect cables?
Did you try swapping interconnect cables Left to Right?
Is everything plugged into the same AC mains outlet?

[esus1]

Hello Thank you for the advice.
I just now determined that a line from the preamp was the culprit eventhough the preamp was turned off.
I disconnected it and the problem is gone.
That line was going to a sub from the preout. I will track this down now that its beend isolated.

Thanks again!

[steverii]

I know this goes against all the safety rules, but I have often had to use a "cheater" plug on the powercord going to the sub to remove hum.