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.