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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: 823925" data-attributes="member: 572"><p>A really difficult and 3-month long convoluted journey.</p><p></p><p>It was only a dead l/h channel. With the assistance of a friend's recommendations and some suggestions from DADA Electronics, I replaced many components - bipolars and some resistors but it kept blowing 1 4A fuse on the L/H board. I can solder carefully and neatly but admit I really am a dufus and didn't really know what I was doing.</p><p></p><p>It was then that I gave the faulty board to my friend who is also not an audio electronics person, being a retired Telkom test equipment tech.</p><p></p><p>Anyway, last night he called me and informed me there was 1 faulty new bipolar ex Communica and this, together with 1 open circuit resistor which was replaced and the fused stopped blowing.</p><p></p><p>So this morning, we set it up with a pre-amp and both channels worked after many weeks of frustration but...</p><p></p><p>The faulty board's heatsinks were very hot :'(</p><p></p><p>After the tecxh left, I had another close look and found one of those black transistors +- 1mm away from its heatsink as its screw had a stripped thread...</p><p></p><p>After hunting through my bins of idential boltsand nuts, I fastened the blerrie thing properly to its heatsink and all is cool and played like it used to - no more overheating.</p><p></p><p>All I'm looking for now is a worthy replacement for my stolen Sansui 317 MK11.</p><p></p><p>skollie</p></blockquote><p></p>
[QUOTE="mafioso, post: 823925, member: 572"] A really difficult and 3-month long convoluted journey. It was only a dead l/h channel. With the assistance of a friend's recommendations and some suggestions from DADA Electronics, I replaced many components - bipolars and some resistors but it kept blowing 1 4A fuse on the L/H board. I can solder carefully and neatly but admit I really am a dufus and didn't really know what I was doing. It was then that I gave the faulty board to my friend who is also not an audio electronics person, being a retired Telkom test equipment tech. Anyway, last night he called me and informed me there was 1 faulty new bipolar ex Communica and this, together with 1 open circuit resistor which was replaced and the fused stopped blowing. So this morning, we set it up with a pre-amp and both channels worked after many weeks of frustration but... The faulty board's heatsinks were very hot :'( After the tecxh left, I had another close look and found one of those black transistors +- 1mm away from its heatsink as its screw had a stripped thread... After hunting through my bins of idential boltsand nuts, I fastened the blerrie thing properly to its heatsink and all is cool and played like it used to - no more overheating. All I'm looking for now is a worthy replacement for my stolen Sansui 317 MK11. 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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