rcw
Yes, I can't think of why there is any purpose there for an 800 volt cap.
Seems to be that they are getting harder to find everyday, but easiest to find on a disc ceramic high voltage type at a 1KV rating, you probably will be also able to find a .005 so….take that offered .01 and parallel the .0005 with it to get the desired .015 ufd value . Plus a disc ceramic is my preference in that particular location.
That then is then giving quite a hefty P/P audio voltage cushion in that application.
73's de Edd
:I am restoring a 1951 chevy car radio. I usually replace all of the capacitors for dependability. I found a .015mfd at 800volts, it is across the plate and the cathode of the 6v6 output tube. I have never run into a higher than 600volt capactors except for the 1600volt buffer cap in the vibrator circuit. I can't get that high a voltage at .015 they go .01 then .02 at 1600volts. do you think I could put a 600volt in that circuit?