You see I've always had to tolerate a bit of hum. Not speakers mind you, talking amp hum. Always had this with my Marantz. The M125's the same thing. Coming from the power transformers. Transformers hum so I figure this is simply part of the ownership experience.
Finding a manual reset model wasn't easy. The one I got is meant for contractors. Some things you just don't want to unexpectedly start up again, like a rip saw!
So I plug it and the magic happens - all of a sudden no hum whatsoever coming from any of the amps! I'm over the moon. Thanks Deepee!!