humming sound

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hi guys and gals
I have a problem with a humming sound. the receiver is a kenwood kr-v8060. I have sound to the speakers but the humming gets louder as I turn up the volume. I thought the filter caps were bad in the power supply. they were 7500uf 71 volt, replaced them with 10000uf 80 volt. still get the humming sound.
any thoughts

Kenny thank you
 
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