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Whoa! Look at Tournament of Roses Parade #2, at 01:26 and following, and 01:58 and following. In these scenes, much of the background is neutral pavement. In the 21CT55 there is a 60 Hz blue hum bar moving slowly upward. The CTC-5 also has a hum bar, but it's weaker and different.
Some portion of these effects could be caused by a beat between the TV video and your camera sensor, but I don't see how your camera could cause two different effects on the two sets like that. It seems like there's some hum in the color circuits or the blue matrix/amplifier, which sometimes makes the bottom bluer and sometimes not. The DC restorer *might* be able to take out hum, but then again maybe not, if the time constants are long.
Besides checking DC restorer operation, maybe you should be looking for the hum.
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Old TV literature, New York World's Fair, and other miscellany
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