The old transmitter could have had several shortcomings:
Poor high frequency video response
Poor differential gain
Poor differential phase
Also, I wonder if they could have been running without a color proc amp and just passing the complete network signal including sync and burst for these brief tests. Technically, this would be an FCC no-no, but if they claimed that it was not part of their regular service and only a test that they didn't expect anyone to watch (in either color or B&W) maybe they could get away with it.
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