Is there a loud buzz with no CD changer connected and just the receiver turned on and set to FM? If so the problem is in the receiver.
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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
Whether switching power supply or linear (whichever it is) try this experiment. Disconnect all inputs to the receiver & retest. Also try turning the AC plug around & test once more. Also try it with the tuner playing. If you get a buzz no matter what, then the receiver's power supply needs repairing.