To determine if your particular set has I/Q demodulation, get the schematic and look for the color IC to have an associated I delay line.
Unfortunately, you cannot find a source today that outputs true I/Q modulation (Laserdiscs may be an exception, but I am not sure); however, you will see some improvement in color detail, accompanied by some quadrature distortion, due to current sources having fairly wideband equiband modulation.
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Old TV literature, New York World's Fair, and other miscellany
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