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There was also a law passed in late 1974 or early 1975 that UHF tuning had to be as "easy" to operate as VHF...thus requiring a UHF tuner that clicks to individual channels. (which is just a detent mechanism of course on top of the same continuous variable capacitor tuner.) Some of the RCA's like the CTC-68 do this very well...there is a readout for UHF showing every channel and the knob travel for each channel was the same as for VHF...most of course just used the knob which does the micro-clicks and displayed every other channel in tiny print.
Actually I don't know if UHF broadcasting ever really cought up to VHF in popularity...most TV's with varactor tuners that I see often do not have the UHF numbers installed in the dial or buttons and do not have them programmed...sometimes there is one UHF on the U1 position but often none.
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