I've got one of these sitting out in the garage, it's in so-so shape and the CRT is weak though I should have something to replace it with.
I dread working on GE sets for some reason, they just seem weird and hard to get working right, my 803 has been sitting half finished because the tuner and i.f. section was so weird I didn't want to deal with it.
I've wondered about that strange hole where the CRT socket is, they all seem to have it and I've never seen one with a cover, did they originally have something to plug the hole?