ANSWERS: 2
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If the speaker crackles when you are adjusting the volume, then if is likely due to a dirty volume potentiometer. If it is not the volume pot, it could be the connection to the speaker jacks on the inside. Either way, there is something wrong with the receiver and you should take it in for repair.
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It is also possible that you have experienced a component failure somewhere in the left channel ciruit (e.g., faulty transistor or IC).
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