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DIY for NAD 7020 Amplifier
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<blockquote data-quote="Ampdog" data-source="post: 760249" data-attributes="member: 144"><p>The post is puzzling.</p><p></p><p>Scratchy noise when a volume control is adjusted can come from the volume control <em>only.</em> But the influence of another loudspeaker of all things complicates matters - if I understand correctly. This leans me to believe that somehow there is a dc voltage over the volume control (most pots will cause a scratchy sound if rotated with dc across it). The presence or not of such dc needs to be investigated. Primary culprit a leaky coupling capacitor, after that - a whole lot of other probable causes. One cannot enter into those without examining the amplifier</p></blockquote><p></p>
[QUOTE="Ampdog, post: 760249, member: 144"] The post is puzzling. Scratchy noise when a volume control is adjusted can come from the volume control [i]only.[/i] But the influence of another loudspeaker of all things complicates matters - if I understand correctly. This leans me to believe that somehow there is a dc voltage over the volume control (most pots will cause a scratchy sound if rotated with dc across it). The presence or not of such dc needs to be investigated. Primary culprit a leaky coupling capacitor, after that - a whole lot of other probable causes. One cannot enter into those without examining the amplifier [/QUOTE]
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DIY for NAD 7020 Amplifier
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