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McIntosh MC205 hum

My McIntosh MC205 hums. It is set up with all the proper interconnects and I use a Krell HT Standard as the processor. It hums and is a bit annoying. Is this natural? I went back to my dealer and they said I had improper grounding. It is plugged into a surge protector which goes into a 3 prong wall outlet. The surge protector indicated protected but not grounded. I have an old house. There are walls that I've opened elsewhere in the house and there ground wires running from the box. So I bought a green ground wire and grounded the wall outlet to the box. Surge protector still did not show grounded.

However, I did go to my dealer, put my ear up to their MC205 and their's hums too.

So is this something natural for an $8000 amp? Any feedback is appreciated.
tobaccoleafpie

Showing 1 response by scanido

scanido
2 posts
 
I can confirm, my 3yr old MC205 emits this hum as well. I just recently noticed it as I got a newer amp and moved the MC205 in a cabinet. The new placement excaberated the hum. I don't mind it as it's in a closed cabinet and not really audible on any type of decent listening anyways.

Seems like this is inherent in the design of these amps.
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