Can moving wire location at circuit breaker reduce hum?

Sounds like there is something else on the line or something with the ground wire.  Have you tried a cheater plug yet?  See what ese works when just that line is working.  Could be like a refrig, or something else cause the problem.

I have a system that was picking up hum when I moved into my current home, but not the previous home.  It's a custom system designed and built by a fellow I've know and used for years (Von Gaylord Audio).  When he visited after the hum was noticed, he was fairly sure  it was electrical interference.  There is a high voltage tower about 200 yards from my home.  He built me a set of shielded cables for the pre-amp to amp interconnects.  That took care of the hum.

Thank you so every much, everyone!

Is a DC blocker like the Hum X device?  If so I've got two of those and they really don't do much at all.

I'll trying tightening the screws and maybe moving the line that goes into my music room but beyond that it seems a bit scary.

On this particular line in my music room I've got other things plugged in and in the other room there are two receptacles connected to this line where a TV, amo and Amazon Firestick is plugged in.

But I get the buzz even when I unplug all unneccessary items.  I have the source components plugged into a PurePower 2000 which is connected to a different receptacle in the same circuit.  The amp goes into a RSA Maxim power conditioner but even if I plug strait i to the wall the buzz remains.

What's really weird is that not all amps will buzz.  Maybe I should have mentioned this sooner.  But more electronics have buzzed in this room.

I've got tubed headamps hum/buz, preamps emit a buzzing and even a CD transport hums.  All these components taken into the room next door and they're all dead silent.

It gets a bit frustrating at times.

I've got a cheater plug laying around somewhere so I'll try that, as well.

Cheers, all.

Mamoru

Some makes and models of amp will hum, some will hum less, and some will not hum at all when plugged in, in certain houses.  Some individual examples of a given amp may hum and others may not.  I've had no hum and variable degrees of hum from different amps, and one nearly drove me crazy: it had mechanical hum at the amp and hummed through the speakers.  I tried it in every room of the house, and it was always the same.  I also brought in 10-12 different boxes of conditioners, DC blockers, ground lifters, transformers, etc. etc., and not a single one cured the problem.  The fact that you get different results in different rooms tells me that the place to start for you is with an electrician, rather than with an extra piece of equipment.

@audiodwebe,

What amps do you have?

Mike