I have some GE caps that are Pyranol filled and AC rated to 660vac. They make really nice speaker cross over caps. I replaced them with some 23F*** AC caps which are also PCB. They do sound good. Wish I had enough for use in a PS. The second place sol'n is the 440vac rated, modern motor-run types. A very close second I must say.

I can't quite reconcile why what has to be a thicker film seems to sound better. Oh well, just because there are no answers today does not mean that they won't appear sometime If we keep looking.
regards,
Douglas