That connector looks very similar to one of the variations of the Classic 4 wire yoke connector, but the wire colors are different.
If these were Apple intended tubes at all, it's possible they were for one of the 12" Macintosh CRTs, but I don't have much to compare with on those. Definitely looks too new to be the Monitor /// tube at least.
I suppose one thing you could look at is whether the cathode end has the usual 7 pin base.