[skyscraper]

The only .5 I see is before the vibrator, from A to ground, is that the one? Since this is a 6 volt set, anything about 10v is fine. 25v is probably a standard value. No problem with using 630v, but they will be much bigger than necessary.

For the 8uf, it depends on what B+ is, but you should be fine with 350v. The 33 output tube requires 180v, so I don't think things are much higher than that.

Edit - I see another .5 now, from the vibrator shield to ground. Same thing with it, low voltage but 630v is also fine.