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This set appears to be from 1973 or 74. 1974 was the last year for RCA tube type color sets. I'll have to check the RCA service manuals for the exact chassis number---I think it is CTC-51 or 52.
I have got two of these type but cannot remember exact chassis number.
It uses solid-state color demodulator modules and has solid-state IF. Yes, it is a series-string set. An interesting feature is that it has a thermal fuse mounted near the horizontal output tube that is connected to the HO cathode circuit. If the heat from the tube is excessive, the thermal fuse opens and the HO shuts down.
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