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#1
08-09-2015, 10:16 AM
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The diode conducts when the end with the line is negative.
This means that when used as a rectifier, the end with the line is the plus end. That obvious diode has the correct end to ground. I do suggest that if you leave that mess as-is, use plenty of vinyl tape! I've been known to do that. Its not OK, well it IS perfectly OK electrically, just leads to nasty comments on Videokarma. 
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#2
08-09-2015, 11:37 AM
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I can't find the schematic anywhere, but if the B+ supply uses a standard doubler circuit, it should be one of the two configurations shown here..
http://www.electronic-circuits-for-h...-two-diode.php The banded end of the Si diode denotes the cathode. Seleneums frequently had a '+' sign denoting the cathode, which is counterintuitive as hell. But that was the convention.
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