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I have to comment that I can't think of a good reason to include 4.5 MHz traps in a video input circuit, unless the input was from a separate RF receiver. Why would anyone deliberately limit the bandwidth?
Edit: I can think of one reason - to create the same awful chroma delay and quadrature distortion that an IF amplifier produces, so that it matches the delay lines in the TV chassis.
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Old TV literature, New York World's Fair, and other miscellany
Last edited by old_tv_nut; 07-17-2015 at 10:16 PM.
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07-17-2015, 10:12 PM
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