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Audio and Video Talk
The Vintage Audio Section
Old Amplifier and Relay Issue
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<blockquote data-quote="Steerpike" data-source="post: 779774" data-attributes="member: 807"><p>Cm81 and Cm82 might be old, dry and leaky. The DC sensing time constant will then be way too short, making audio transients cut off the output, instead of genuine DC.</p><p></p><p>That has nothing to do with the distortion though, or the high temperature; is the idling current now correct and stable? Other leaky capacitors in the output bias circuit could be the cause of that.</p></blockquote><p></p>
[QUOTE="Steerpike, post: 779774, member: 807"] Cm81 and Cm82 might be old, dry and leaky. The DC sensing time constant will then be way too short, making audio transients cut off the output, instead of genuine DC. That has nothing to do with the distortion though, or the high temperature; is the idling current now correct and stable? Other leaky capacitors in the output bias circuit could be the cause of that. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Old Amplifier and Relay Issue
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