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As John pointed out, you could adjust the saturation and hue on an adapter like the Col-R-Tel since it was receiving a standard composite NTSC signal which you could adjust before matrixing it into the R,G and B fields, but for the true field sequential standards like the CBS, there is no way to adjust either. Since there is no composite color information being sent, and each color field is received sequentially as a monochrome image containing only the appropriate color for that field, the color information is in effect embedded in the fields, and can not be modified easily. The saturation and hue are set entirely by the filters in the camera and the montior. (some correction would be done at the camera end)
While it would be possible to at least provide hue control at the monitor end, it would have required a seprate brightness/contrast controls for each color field that would be switched in at the appropriate time. I think this would have been to cost prohibative at the time to be worth while.
From the fading we have seen of the original filters, it appears that they would need to be replaced periodically to keep the set performing properly, although it's hard to say how often this would need to be.
Darryl
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