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A while back, my friend who still has a little luck with selling old TV's, said that someone asked him if he had a knob tuned TV. They went on to say that some elderly member of their family was used to that type of TV and would be confused by a remote. I told my friend that I could fix them up with such a TV; but, they would likely be bringing it back once they found out that it wouldn't receive anything without some sort of box that is operated by remote control.
Around here, if you're on cable or satellite, you must have a box regardless of how new or old your TV is (the only possible exception are newer TV with cablecard provisions.
The Zenith TV with "omni electronic tuning" uses the same variable knob for VHF and UHF, with a rocker switch to select between VHF and UHF. In the old days, it would probably tune some of the cable midband channels between VHF channels 6-7.
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