The Beltons are OK, but that one is a chassis mount. This guy solders directly to the board.
Curiously, the two phono sockets are not original. The originals are a nice phenolic socket, possibly an Amphenol with a grounding finger for the shield but not 100% on that. The two phono sockets are mismatched cheapo wafer sockets with no finger, so there is a wire ground soldered from the circuit board to the tube shield. Why on earth someone would change them out to that, I have no idea. Its unfortunate because the only trace damage on the board is around those sockets. They have been awkwardly patched, and will need further work whenever I change them.
I de-oxited the BS out of them and scrubbed the pins and contact points and I have both channels working now. I'd still like to change them, ideally to ones that match the originals.
I'll see if I can turn up some NOS ones. I just hope I'm not looking for some unobtanium socket with an oddball pin circle or something. I can make do without the ground finger if i have to.