Anyone with experience with the effectiveness of the AVA HUMDINGER?

Just got a new amp -- Rogue ST 100 -- and have transformer hum.  First time ever in my system.  The factory says something about DC voltage on the incoming AC line.  My son the electrician says he has never heard of that happening.  He says we switched from Edison to Tesla a few years back. 

Anyway, I have tried all kinds of things to see if I could eliminate/reduce it  to no avail:  different circuits, disconnect everything else from the system (other than speakers)  disconnected the powered woofers in my speakers and the subwoofer, tightened the bolts holding the transformer down,  etc. etc.

So maybe the Humdinger is worth a try??   Some other way to handle it (other than a new transformer which the factory says it will do if its really the transformer)?.  Anyone with experience with any other solution?  Thanks for your help..  Regards,  Rich