I had similar problems with a Sony RX that i took to a friends house for him to use. This model had one of their "fancy" pulse width ( or some funky name ) power supplies in it. No matter where we plugged it into in his house, it had a nasty buzz to it. Several other receivers worked fine though. Plugging the Sony into any outlets in my or anyone else's house did not present a problem. My guess is that this guy ( and your Father ) have got something wrong with their house wiring. Sean
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