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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: 824311" data-attributes="member: 572"><p>Thanks for the kind interest, guys. The gentleman who has been assisting me has been a good friend of mine for many years. I kept the amplifier throughout all of these frustrating weeks and he (my friend) only has posession of the faulty left channel's board and heatsink.</p><p></p><p>The amp is now in its entirety with me and tomorrow, I will again look at the faulty board with a strong light and magnification. BTW, all new transistors have been fitted with white paste and each item has new insulation strips. </p><p></p><p>It was just by pure chance that I spotted the transistor which was 1mm away from the heartsink which I thought had cured the problem as for the first time in several months, both channels worked properly for about 5 minutes before things got hot again but no fuses blew</p><p></p><p>Todays's testing was scary. As mentioned lots of heat spreaded also to the fluted heatsinks across the front panel but no blown fuses..</p><p></p><p>After tomorrow's close inspection by myself and if I can't see anything obviously wrong, I will leave it until after the season days are over.</p><p></p><p>My friend this evening mentioned oscillation outside the audio band which we will check for with my oscilloscope shortly.</p><p></p><p>I noted your recommendation re Albertronics and will consider after giving my friend another chance.</p><p></p><p>skollie </p><p></p><p></p><p> </p></blockquote><p></p>
[QUOTE="mafioso, post: 824311, member: 572"] Thanks for the kind interest, guys. The gentleman who has been assisting me has been a good friend of mine for many years. I kept the amplifier throughout all of these frustrating weeks and he (my friend) only has posession of the faulty left channel's board and heatsink. The amp is now in its entirety with me and tomorrow, I will again look at the faulty board with a strong light and magnification. BTW, all new transistors have been fitted with white paste and each item has new insulation strips. It was just by pure chance that I spotted the transistor which was 1mm away from the heartsink which I thought had cured the problem as for the first time in several months, both channels worked properly for about 5 minutes before things got hot again but no fuses blew Todays's testing was scary. As mentioned lots of heat spreaded also to the fluted heatsinks across the front panel but no blown fuses.. After tomorrow's close inspection by myself and if I can't see anything obviously wrong, I will leave it until after the season days are over. My friend this evening mentioned oscillation outside the audio band which we will check for with my oscilloscope shortly. I noted your recommendation re Albertronics and will consider after giving my friend another chance. 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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