Slight hum in my amp. Is this normal?

I’ve worked with the national distributer trying most of what you suggest (cheater plugs, with source, without source etc.). The only thing I haven’t done is unplug everything in my house. I’d bet green money that the integrated is the source of the hum. My Balanced Audio Technology integrated is silent using the same electrical circuit. The noisy amp is under warranty. It works well with normal speakers so I may try to trade it in for some quite tubes or the new Pass Labs 25 watt SS amp. Thanks for your concern and advice.

dweller,

Does the integrated amp hum with nothing connected to any of the inputs?

Does the hum sound like this? 60Hz.
https://www.youtube.com/watch?v=SVZ2P0KsLic
https://www.youtube.com/watch?v=Lnd57eOyesk
.

Or like this? 120Hz.
https://www.youtube.com/watch?v=pC4Uzt0qm2E
.

Check this out. A tube causing a 60Hz hum?
https://www.youtube.com/watch?v=GrVtX0QGNls

@jea48 - It sounds most like your last link. Does the PL integrated have separate tubes per channel? Or could a single tube cause hum in both channels?

Is your system connected to a cable box or satalite dish via RCA interconnects? Sometimes the cable companies don't ground their outside connections to the home. This can cause a hum that will heard through the speakers. 

N