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Do keep in mind it was more about the prevailing technology of the day along with other factors like tip writing speed (drum diameter) and tape characteristics. The color under (downshift carrier) isn't as important as the actual bandwidth of said carrier and its transient time window to shift the phase, this window is roughly 10% of the actual color subcarrier before down conversion which would be about 100KHz wide giving a working differential of 50KHz or 30 horizontal lines of chroma resolution in the real world.
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