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I just finished a 1958 RCA similar in size to this one. These ususally have a metal shield across the back of the PC board that is hard to remove, increasing the difficulty of working on them. However, some previous servicemen had removed the one on this set. It seems to work ok after restoration without it.
I learned a couple of things on this set. After restoration, the vertical would shrink in height as the set warmed up. I had replaced all the capacitors in the vertical sections except a couple that I thought were of the later film design. I thought that as they looked like brown versions of the Sprague type orange drop capacitors. I went ahead and replaced these and things improved drastically. I will not make that mistake again.
I still had some shrinkage after warmup. I then replaced the NOS RCA 6AQ5 tube that I had in the vertical output socket(the correct tube for this set per the RCA service manual) with a NOS GE 6AQ5. This fixed the final shrinkage issue. I think the RCA 6AQ5 is ok for an audio output, but not quite strong enough for the vertical output use in this set.
The metal case on this set gets quite warm in the tube area after playing for an hour or so. I am sure that is hard on the internal components. That may be why the more modern looking capacitors failed(or they may have been the old capacitor design in a more modern looking case).
Per the above comment about cable, I have this TV on a DTV converter box. It works well. I suspect it would also not work well on cable as sets of this era have poor selectivity, especially the cheaper ones.
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