Quote:
Originally Posted by stromberg67
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. 
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I think GE, as well as a lot of other TV builder's quit building color sets around 1958.
Admiral quit building their own chassis and started buying RCA chassis, as well a few others.
The problem was a lack of color programming.