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Yes, I agree if the b&w set has resolution at 3.5 mhz, and if you know what to look for. But I’d say most folks didn’t notice. Initially chroma was tried at 3.89 MHz and other frequencies pre-1953, during the CPA trials, to minimize ability to see the chroma on the b&w sets of the day with really good video response.
I mentioned 60 Hz hum, both in the home receiver and at the tv station equipment. That mostly went away as transistors replaced tube equipment. All you could do is minimize it like in audio. I heard of ONE station that ran all video equipment filaments on DC! And yet we managed for many decades.
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