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Have you seen any example of a set without this?
It is possible that you are looking at an imperfection that is present in most sets to a slight degree due to not having a perfect Nyquist slope around the video carrier. Analog systems have a vestigial sideband in broadcast and a double sideband in home modulators, both of which extend beyond the lower edge of the receiver bandpass. Analog systems depend on the receiver response having a symmetrical slope around the video carrier. Any imperfection in that slope will show up as a smear of some kind.
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