Help With Buzzing Sound

First, of course, try to rule out any issues with the amp itself, but here's my similar story:

A few years ago I spent an inordinate amount of time chasing down a buzz from a single of my two monoblocks, and ultimately fixed (i.e., completely eliminated) it by moving my entire system over to power from a 2.4kv AC line transformer (Topaz).

Before that purchase (a few hundred dollars) I figured out the issue stemmed from a dimmer on the under-cabinet lights in the kitchen, but for whatever reason it only affected one channel. It was nevertheless 100% solved with the A/C transformer.

Good luck to you - I know first hand how frustrating that can be! 

@acefactory  Thanks.  Pretty sure it's the amp itself.  Only three years old with light use.  Hoping for some insights as to the most likely internal issue.  A bit surprised by the lack of response?  Cheers. 

Try a cheater adapter on the power cable to eliminate a potential ground loop issue. 

@OP Buzzing has three principal causes - mains or signal grounding issues, electromagnetic interference, or component failure. If you have absolutely eliminated the first two then the first place to look is the power supply in the amp. Regrettably, if you are not a technician yourself, you probably have no option but to enlist the help of one. If the amp is out of warranty, any decent tech should be able to fault find it. Power amps are among the simpler components in hi fi. I know you say you have moved things around, but if you haven't done it, I would physically move the right hand amp and all of its cables over to the location of the left hand amp. EMI can be weird. It's a very long shot but worth checking. However, I still agree with your surmise that it's the amp that has a problem. But you never know.