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Audio and Video Talk
The Vintage Audio Section
My trusty Quad 405 MK 1 is fixed!
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<blockquote data-quote="handsome" data-source="post: 824897" data-attributes="member: 772"><p>if you up to it rather get a circuit diagram of the amp with the voltages marked, then use a multimeter to check the voltages at all the points. the problem should become glaringly obvious from the discrepancy between expected and measured voltages. those Quads are class B amplifiers so there should be no current in the output stage. the fact that the heatsink gets red-hot means something attached to said heatsink is passing way too much current.....</p></blockquote><p></p>
[QUOTE="handsome, post: 824897, member: 772"] if you up to it rather get a circuit diagram of the amp with the voltages marked, then use a multimeter to check the voltages at all the points. the problem should become glaringly obvious from the discrepancy between expected and measured voltages. those Quads are class B amplifiers so there should be no current in the output stage. the fact that the heatsink gets red-hot means something attached to said heatsink is passing way too much current..... [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
My trusty Quad 405 MK 1 is fixed!
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