My house is less than 10 years old and I don't have the hum when plugged in to a different circuit. I'm not sure, short of a hum eliminator, how I'd be able to fix this on a rather tight budget.
I can just turn the gain way down and still get a pretty hot signal out of the Eclipse so I should be fine... just, as I mention, not used to that. I guess in retrospect I've had to turn the gain down on some things at times just to not overload the incoming signal from the source and/or to tweak the noise floor but in general I don't have to.
I haven't done much in the studio for about two years now and just recently re-arranged and trying to get things to quiet down. It's never been easy to obtain silence.