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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="mafioso" data-source="post: 824657" data-attributes="member: 572"><p>I wrote too soon re this boring topic about an amp many people despise for whatever reason. Anyway, I like it and as written above, the dead left channel works again and doesn't blow one of the 2 aA fuses on the board.</p><p></p><p>During 5 to 10 mins playtime, the board's heatsink overheats a lot. After halfhour playtime, something on the left channel board overheats the entire heatsink including the fluted front casework - so hot that one can fry eggs on it.</p><p></p><p>I'm giving the friend who has been helping me needs a Christmas break so I want toi have a look see if I can discover why the channel is overheating so much.</p><p></p><p>The amp is currently connected a a pr of Denon 8ohm speakers a pre-amp and a radio for a source. And Unplugged from the mains and most of the covers off.</p><p></p><p>All 4 transistors have been replaced with Dada's best recommendations and the loose transistor's heatsink has been properply fixed with its insulating strip and white paste.</p><p></p><p>My question: Will it be safe to use a pair of surgical gloves to try and probe WHERE on the bloody board the heating originates from with everything connected and the mains switched on? There are many sharp objects on the board and I will take care not to puncture the glove.</p><p></p><p>skollie</p></blockquote><p></p>
[QUOTE="mafioso, post: 824657, member: 572"] I wrote too soon re this boring topic about an amp many people despise for whatever reason. Anyway, I like it and as written above, the dead left channel works again and doesn't blow one of the 2 aA fuses on the board. During 5 to 10 mins playtime, the board's heatsink overheats a lot. After halfhour playtime, something on the left channel board overheats the entire heatsink including the fluted front casework - so hot that one can fry eggs on it. I'm giving the friend who has been helping me needs a Christmas break so I want toi have a look see if I can discover why the channel is overheating so much. The amp is currently connected a a pr of Denon 8ohm speakers a pre-amp and a radio for a source. And Unplugged from the mains and most of the covers off. All 4 transistors have been replaced with Dada's best recommendations and the loose transistor's heatsink has been properply fixed with its insulating strip and white paste. My question: Will it be safe to use a pair of surgical gloves to try and probe WHERE on the bloody board the heating originates from with everything connected and the mains switched on? There are many sharp objects on the board and I will take care not to puncture the glove. skollie [/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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