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Junior Varsity
Crest repair center needed
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<blockquote data-quote="John Roberts" data-source="post: 71754" data-attributes="member: 126"><p>Re: Crest repair center needed</p><p></p><p>FWIW a repaired PCB with wire and solder could actually have more cross sectional area and more current carrying capability than the original copper that was only a couple mils thick. </p><p></p><p>The PCB trace opening up was probably not the primary failure mode, but a side effect of some other parts failing and then drawing excessive current after that failure that caused the additional incidental damage.</p><p></p><p>Amp designers routinely use over-wattage parts in places like emitter current sharing resistors on power devices since they have a tendency to vaporize when transistors fail (which is pretty common). PCB traces are typically sized adequately, but it is hard to anticipate every possible failure scenario. </p><p></p><p>AFAIK the 8200 and 9200 are good soldiers and should treat you well, if you treat them OK. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 71754, member: 126"] Re: Crest repair center needed FWIW a repaired PCB with wire and solder could actually have more cross sectional area and more current carrying capability than the original copper that was only a couple mils thick. The PCB trace opening up was probably not the primary failure mode, but a side effect of some other parts failing and then drawing excessive current after that failure that caused the additional incidental damage. Amp designers routinely use over-wattage parts in places like emitter current sharing resistors on power devices since they have a tendency to vaporize when transistors fail (which is pretty common). PCB traces are typically sized adequately, but it is hard to anticipate every possible failure scenario. AFAIK the 8200 and 9200 are good soldiers and should treat you well, if you treat them OK. JR [/QUOTE]
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Crest repair center needed
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