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I looked in Television Engineering Handbook (Fink, 1957) which says the L1 cable color signal had 2 MHz luma with heterodyned chroma between 2.1 and 2.7 MHz (so +/-300 kHz chroma bandwidth).
VHS has a luma limit of about 3 MHz. This Nutcracker video doesn't look limited to 2 Mhz to me. Again, some of the resolution degradation could be due to the digital coding.
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Old TV literature, New York World's Fair, and other miscellany
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