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That set is probably from the early '80's with a single board chassis and inline CRT.
I think 1980 was the very last year for RCA to use delta gun CRT's. And, those last delta gun RCA CRT's were not that great. It seems that most of the ones I see are either weak or shorted. I've got a '79 19" RCA with a delta gun tube and it has an RCA Hi-Lite tube in it that was installed in 1980. So, the original tube didn't last long in that one.
Zenith used them up until '79 in the last chromacolor II consoles. The newest delta gun set that I've seen was, IIRC, an '81 Teknika console that I think was actually built by Wells-Gardner. I think most of the other major brands phased out delta gun tubes in their consoles during the '79-'80 time period. Many of the smaller screen sets started going inline in the '74-'76 time period.
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