Quote:
Originally Posted by dieseljeep
The "B" line models we the 1966 models.
That model was the first GE set to use the "Crystal Ringer" design. Actually it's a glorified Porta-color. 
It could be similar to the '57 21CL500 color circuit. 
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Good ol' GE used the ringer circuit in the 15CL100 from 1954, and in most if not all color chassis after. Not a bad circuit IMO, but as with any design, problems occur.