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Are these old silicon diodes from the 60's? I have had a lot of trouble with old diodes, probably just as much as bad electrolytics if not more. A lot of the time they end up shorting which just causes a cascade of trouble as AC ends up going into the electrolytics through the shorted diode.
I just replaced some diodes (along with all capacitors) in a voltage doubler circuit on a Harman Kardon tube type amplifier...used 1N4007 (1 amp, 1000 volt) and they seemed to work fine.
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