Perhaps a power conditioner would help. I have a panamax unit that is fairly inexpensive, and works great.
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I have had several systems that I had to trouble shoot humming out of. The first had to do with a Ground loop at the Wall Plug, that was easily fixed by a 3 prong, 2 prong adaptor. The second problem I had, dealt with a hum from Cable TV coming into the house, not being grounded. You can get a Adaptor at the Rat Shack for that. The 3rd and most difficult problem I had with my new system, was a halogin light and a Flouracent(sp) light being on the same Circuit as my amp and speakers(I have built in Subs plugged in). A line conditioner didn't work. I had to rewire a special dedicated curcuit. Hope this helps.
Before we start looking for culprits outside the system, maybe we ought to look for culprits inside the system. First, is the noise in both channels or only one? If only one, it's pretty easy to figure out the component that's causing the problem by switching cables from left to right.
Assuming it's in both channels, I'd suggest borrowing alternative components and swapping individual items out of the system. Once it's clear what component is causing the problem, he would do better to return it and look for something that actually works. For 10 grand, that's the least you should expect.
Just received a message from my friend.
Finally the problem was attributed to a defective valve (ECC 82)which was replaced. No hum or hiss being produced from the system anymore.
I appreciate everyones input on this thread and their contributions.
Thank you very much for free remote assistance in solving the problem.