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My guess is the AFC on setting is only for use with devices without crystal controlled RF output (most games and VCRs channel 3/4 modulators) in case they are far off the standard frequency.
The tuning frequency is crystal controlled, and more accurate than an AFC circuit. You must be in the broadcast mode except when connected to an analog cable system that uses one of the other frequency charts.
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Old TV literature, New York World's Fair, and other miscellany
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