[Arran]

 I hate it when people install radial lead electrolytics and leave them hanging in space by the leads. At the very least they could bundle them together and clamp them to the inside of the chassis with something, nylon cable tie, locking wire, a strip of All Round with a screw nuts, and washers. Someone didn't have their head screwed on straight leaving those green Sangamo "Little Chiefs" in place, those are one of the few paper caps I have had get hot and attempt to spew it's contents out the the end.
 I'm not sure about the speaker connector, but the Canadian RCA, G.E and Philco sets that I have from that era all used the same four pin connectors, I think they were made either by Amphenol or Ebby. The plug part had four pins, two were closer together then the other two, and was mounted on the back of the speaker, the socket portion was on the end of the speaker cable. 
Regards
Arran