12-21-2012, 08:57 PM
It's a capacitor on the cathode of the #78 IF amplifier tube, it's in parallel with a 400 ohm resistor, a 630 volt .1 microfarad cap will be fine there, in fact a 200 volt one will be fine there, there is no way it will ever have 1000 volts across it.
Regards
Arran
Regards
Arran