Sony TA343 Crackling

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Dear Friends,

I am working on a Sony TA343 amp, which has a volume pot crackling problem. When the loudness switch is off, the volume pot works perfectly well, when I turn it up and down and all the other functions as well. When I switch on the "loudness" switch, the loudness works, but when I turn the volume pot up and down, there is a crackling sound. With the loudness off, it is normal. Pls advice.

Thanks

Carlos
 
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