[Arran]

No, the beam of light phonographs used a connector and socket that was proprietary to Philco, they did not use RCA jacks. Some Canadian market Philco models did use RCA jacks and sockets but not the Canadian versions of U.S models.
Philco had a adversarial relationship with RCA, much more so on the U.S side, that was why you didn't see Magic Eyes or metal tubes in Philco radios as original equipment. Philco wasn't about to pay royalties to RCA unless they absolutely had to, so the last thing they would do is use an RCA phono jack. Why they didn't come up with their own alternative like they did with other things only they could answer. But it wasn't just with RCA patents they had a similar attitude when it came to Armstrong's FM patents, that was why they came out with some funky detector circuits using things like the FM1000 and XXFM tubes.
The Bing Crosby I have, it's called a model 76 in Canada as opposed to a 46-1201 like in the U.S, has everything hard wired, no plugs of any sort. This was rather short sighted as you need to desolder those wires, along with those for the loop antenna, out of the cabinet just to remove the radio chassis. As a result I think that I may have been the first person to pull the chassis out since the set left the factory in 1946-47.
Regards
Arran