Vintage Synth Repair

See it can be rocket science! :)

I'll check the PSU board once it's up and running again for sure. But to be clear: even IT wasn't connected. Just a cable, switch, fuse, and trafo. The trafo shows the correct ac voltage on the primary and that wacky megaohm measurement on the secondary.

From what I can tell, it needs to be center tapped with a minimum of 36V split down the middle to handle the needs of both sets of voltage outputs. The reason I inquired is because I didn't want to get a replacement that would put too much or too little load on it at 500mA. Wouldn't 50V be overkill? Also - the schematic also hints at 1A after the secondary but the fuse shows a 500mA limit. See whay I'm asking? :D