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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: 786166" data-attributes="member: 807"><p>DM18 is there to monitor the presence of mains, and cut the speakers off as soon as AC mains is too low, or vanishes. If the amp did not do this sensing, you get a situation where the amp continues to operate on the charge stored in the power supply capacitors, for a minute or so after the mains is switched off.</p><p>They may have needed to make it more sensitive to low AC supply, and so modded the diode.</p></blockquote><p></p>
[QUOTE="Steerpike, post: 786166, member: 807"] DM18 is there to monitor the presence of mains, and cut the speakers off as soon as AC mains is too low, or vanishes. If the amp did not do this sensing, you get a situation where the amp continues to operate on the charge stored in the power supply capacitors, for a minute or so after the mains is switched off. They may have needed to make it more sensitive to low AC supply, and so modded the diode. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Old Amplifier and Relay Issue
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