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Audio and Video Talk
The Vintage Audio Section
Marantz PM-30 Amp
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<blockquote data-quote="markc" data-source="post: 479868" data-attributes="member: 15232"><p>Some more.</p><p></p><p>In these vintage DC amplifiers there are usually two adjustment pots for each channel (four in all). One sets the no signal idle current, usually around 20-50ma and the other adjusts the DC offset to zero volts. If the offset adjustment drifts then it can trigger the protection circuit that drives the speaker protection relay.</p></blockquote><p></p>
[QUOTE="markc, post: 479868, member: 15232"] Some more. In these vintage DC amplifiers there are usually two adjustment pots for each channel (four in all). One sets the no signal idle current, usually around 20-50ma and the other adjusts the DC offset to zero volts. If the offset adjustment drifts then it can trigger the protection circuit that drives the speaker protection relay. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Marantz PM-30 Amp
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