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The Zenith power tuning sets included all of the motors to drive the power operated functions such as the channel selector, it just lacked the space command receiver. Some of these sets use a single-knob tuner system that uses a conventional VHF and UHF tuner but works like the later Zenith Varactor single knob tuners in that they allow you to pre-program desired UHF channels into the UHF positions on the knob.
One thing I have found is that on TV's with varactor tuners the UHF channels are not usually set up. The sets all came with channel numbers that you could replace the asterisks or the U1, U2, etc. with on the tuning display or dial but very few ever have these numbers installed, or are set up for UHF channels. I have observed this both in N.E. Ohio where I collected TV's as a kid and also in West Tx. where I live now.
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