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Hi,

My Harman Kardon receiver has developed a hum that I cannot isolate. The hum seems to correspond with the picture. It's there with Apple tv and Directv. It doesn't go up or down with volume control. However, sometimes it changes depending on the picture. For example, when I switch icons on Apple tv, it hums in between. The hum is there, even when I disconnect the optical cable. I've never posted on the forum before. Any advice from the collective wisdom would be much appreciated!
 
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