Thanks, Jim.
I usually avoid going down in voltage rating, and it never hurts to ask first. Anyway, I'm just poking around at the moment. Not sure I really want to change much in the psu's.
Yes, that tranny really opened up after just a few hours. I also changed out the coupling cap for a good Panasonic ECG and Vishays for the resisters. Don't really know how much difference these two made, but the overall sound is greatly improved. So much more detail and nuance. Maybe the next thing is to upgrade the board mount RCA.