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General Discussion
Cracklin' Rosie
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<blockquote data-quote="ludo" data-source="post: 75223" data-attributes="member: 691"><p>Cap(s) leaking somewhere in the preamp section is my guess. Not of necessity the ones connected directly to the volume pot.</p><p></p><p>I don't have a schematic for this one but I'd think it's a single-supply job. Then you need caps all over the place to keep the biasing around the 50% mark of the supply. Old caps leak, but that leaking is a sporadic process. Noisy. They do reform but after 30-40 years it's time for fresh ones. Otherwise one day something goes KATABAM! in the preamp and then your speakers have a permanent crackle...</p><p></p><p>Blood from a stone is fun, but just replace the lot. It's cheap, even when using nice ones.</p><p></p><p>If you jiggle the selector switches slightly, does that cause any noise?</p></blockquote><p></p>
[QUOTE="ludo, post: 75223, member: 691"] Cap(s) leaking somewhere in the preamp section is my guess. Not of necessity the ones connected directly to the volume pot. I don't have a schematic for this one but I'd think it's a single-supply job. Then you need caps all over the place to keep the biasing around the 50% mark of the supply. Old caps leak, but that leaking is a sporadic process. Noisy. They do reform but after 30-40 years it's time for fresh ones. Otherwise one day something goes KATABAM! in the preamp and then your speakers have a permanent crackle... Blood from a stone is fun, but just replace the lot. It's cheap, even when using nice ones. If you jiggle the selector switches slightly, does that cause any noise? [/QUOTE]
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Audio and Video Talk
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Cracklin' Rosie
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