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I did not know ABC used TK-27 film chains. All of my ads show GE color film chains although I have an old RCA ad from 1955 that shows a B&W RCA TK-21 film camera connected to a RCA 35mm film projector so I know ABC did use RCA equipment (as well as others).
I am not at home right now but somewhere at home I have a link that explains how ABC started colorcasting. From what I remember (and I could be wrong), when ABC started to colorcast in September 1962 with the Jetsons and Flintstones, they had no color film cameras in NY so they had to have their LA broadcast center (that had a RCA TK-26) show the programs and microwave them across the country to NY for network feeds. It was not until seven months later (April 1963) when ABC installed the GE color film cameras in NY that they were finally able to originate colorcasts from NY.
We got our first color TV in the fall of 1963 and I spent many of hours watching color back in those days and could actually tell what brand of color film camera a station had by just watching their film broadcasts. RCA TK-26 and GE looked similar, but TK-27 films looked way different and were awful compared to the GE and older RCA TK-26. TK-27s were washed out, low in contrast and saturation and did not the "wow" look of the others. I have read since that even NBC did not want to use the TK-27s for the same reason and kept the TK-26s going until the TK-28 3 tube film cameras came out later.
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