> My next thought, as suggested in this thread, was to hipot the HT
>transformer, though why that shorting under load would kill a diode
>string escapes me.
Sketch a circuit:
transformer secondary, label the ends A and B. Diode from A to the + end
of your caps, cathode (arrow and bar) towards the caps. Diode from B to
-ve on the caps, cathode to B. -ve of the caps to ground. The other two
diodes in the bridge aren't doing anythig during this half cycle when
end A is +ve, end B -ve.
Assume point A shorts to to the transformer core and thus to ground,
thus to -ve on the caps. Draw in a wire from A to caps -ve. You then
have a diode straight across A and B, trying to conduct the whole
current the winding can produce. Phut.
Steve GSQ
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