Gjkphd, like I said, my suggestion to change from a fusebox to breakers is more of a homeowner's perspective than an audiophile's. I honestly don't know how or if it would affect the audio quality. But I've been looking at a lot of houses to buy recently, & an old fusebox is definitely not desirable. Even 150 year old houses in nice condition will usually have updated electrical (circuit breakers). All I'm saying is, if you're going to spend $$ to get dedicated lines, when you're getting estimates, get a quote on this; it might not be more than a few hundred $$, & would be a nice update to your house, help the resale value, etc.
BTW, the fact that you have some 20 amp fuses doesn't necessarily mean they are on a "20 amp line". People use 20 amp fuses all the time (when 15 amp fuses are called for) because the 15 amp fuses blow when they plug in an A/C or something.
I realize this may be a bit O/T for your audio issues; just my 2 cents worth.
BTW, the fact that you have some 20 amp fuses doesn't necessarily mean they are on a "20 amp line". People use 20 amp fuses all the time (when 15 amp fuses are called for) because the 15 amp fuses blow when they plug in an A/C or something.
I realize this may be a bit O/T for your audio issues; just my 2 cents worth.

