Hello, 60 Hz hum is always caused by a ground loop or defective filter capacitors within the receiver. Capacitors filter out 60 hz hum generated FROM the receiver- but have nothing to do with the hum being generated elsewhere. Generally the cable box (if applicable) is what causes the hum due to the ground block on the outside of the house causing a "loop" (multiple ground points).
That said, without details nobody could tell you what the root cause of the hum is.
What's plugged into the receiver (cable box, TV, etc.)?
When did the problem occur?
Does the hum raise and lower with volume?
Is it there with ALL sources (try the FM tuner- does it still hum)?
Please elaborate and we can proceed.
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