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A 1N4007 1000 volt 1 amp diode should work well...if there is not a surge resistor ahead of the rectifier you can add a 100 ohm 10 watt resistor between the power line and the anode of the diode to help absorb the turn-on surge and slightly drop the voltage to approximate the selenium.
While you are in there replace the electrolytics and any paper caps too.
As for the cap on the powerline I would just remove it...have done this with Zeniths and had no problem. Also a fuse in the power line would be good, 1 amp should do.
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