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While the older the better, I do have some interest in hybrids and early solid states. The number of hybrid sets made has to be small compared to even 21" round screens. I'd participate in a group for late tube and to early solid state TVs. Such interesting things as sony's 7" chromatron would fall into that.
That RCA you posted has an identical cabinet to an all tube one from the late 60's that was given to me about 10 years ago. I was probably in junior high at the time. The set did work, but the CRT was weak so I didn't keep it long. It had one of those low focus voltage CRTs that were popular in the late 60's. RCA referred to it as an einzel lens system. It's interesting that these CRTs only require at most a few hundred volts to focus and it isn't dependent on the HV. However, I've never seen one with very sharp focus and they seem to go out of focus badly with age. The usual lack of a real focus control doesn't help either. I think this RCA had a 3 or 4 position jumper.
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