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Nakamichi AV-10 zinnnnnnnn sound

Nakamichi AV-10 produced a sound like zinnnnnnnnn from speakers even without to connect any audio input 
thanks in advance 

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Shizo
Shizo picture
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Eliminate from where come this sound, disconnect volume potentiometer's input and try it, I think it's from preamplifier stabilizator like 7815 and/or 7915

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