Quote:
Originally Posted by zeno
GE portacolors were probably the last, also they had a
19" , C-2 chassis IIRC that probably was almost as late.
They were used in many store brands & started at $250.
A real toilet IMHO. Zenith ran the 4 tube hybrid til F-line
1975 as a leader 19". They also had a 14" 1/2 tube
chassis that may have sold in G-line but dont remember.
Most ended in 74-76, people didnt want tubes anymore.
73 Zeno 
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I don't think, there's any set that stayed in production as long as the Porta-color. It seems like 11 or 12 years running, with minor revisions. OF course, the last models came out with the high voltage focus CRT.
I tried doing a little research, regarding these sets. It seems like the first set was a HB chassis, which was a 1966 model set. That one uses a 11SP22.
I really don't think, they built them after early 1977.