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Since that boost diode's been replaced with silicons, be sure to monitor it (them) for overheating.
The original part being selenium, it could handle the fast retrace ("fly-back") spike whereas silicons lagged in fast-switching ability.
It might be worth asking somebody like Mouser or Digikey if they've got Schottky diodes in high enuff voltage rating. Or you could series 'em.
Last edited by old_coot88; 10-30-2015 at 12:39 PM.
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