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SL+ cooked R37 and tube board connector
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<blockquote data-quote="eedude" data-source="post: 82187" data-attributes="member: 2549"><p>so i got the unit from mtsweapon. The failure was at the header connector for the tube board, that pin that's fried in the pic. This was a classic case of the Randall "arc over" failure. The ground on the board is too close to the B+ on that pin. Under the right conditions the high voltage arcs to ground, once it does this the solder mask is penetrated and the arc will continue. This crates a low impedance path to ground drawing significant current, thus frying the R which is in series with that B+ line. </p><p></p><p>I ended up removing that pin, replacing the R, and adding a wire from the R to the tube board. It's all good and happy now, no other components or the tubes were damaged.</p></blockquote><p></p>
[QUOTE="eedude, post: 82187, member: 2549"] so i got the unit from mtsweapon. The failure was at the header connector for the tube board, that pin that's fried in the pic. This was a classic case of the Randall "arc over" failure. The ground on the board is too close to the B+ on that pin. Under the right conditions the high voltage arcs to ground, once it does this the solder mask is penetrated and the arc will continue. This crates a low impedance path to ground drawing significant current, thus frying the R which is in series with that B+ line. I ended up removing that pin, replacing the R, and adding a wire from the R to the tube board. It's all good and happy now, no other components or the tubes were damaged. [/QUOTE]
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Modular Amps
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SL+ cooked R37 and tube board connector
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