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The quartz lines are not for the ~1 microsecond difference between luminance and chrominance, but for a one-scan-line delay, either for chroma phase error cancellation (in PAL) or comb filtering (in NTSC). The quartz lines work by ultrasonic sound to propagate the signal, which is much slower than an electromagnetic wave.
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Old TV literature, New York World's Fair, and other miscellany
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