Sorry for the confusion, and you're right, an unloaded cap will charge
to 1.414 times the RMS value of the unrectified sine wave, no matter
whether the output of the rectifier is full-wave or half-wave.

No worries, mate! I'm learned(er).

Chances are that a loaded one will also, since most power supplies are
designed to have the cap charge fully and then discharge, between peaks,
to yield an acceptable ripple.

Wow. That's probably why the original 150v cap is no good after 40 years. It
should have been spec'd higher. Is 160 good enough for this application?

Thanks.