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The channel indicator drum setup looks identical to the later Zenith single-knob varactor tuners (although the rest looks different).
I know I had a Toshiba varactor set with touch pads that used a voltmeter as a channel indicator when you were tuning in UHF channels...maybe that is what the meter is for here as I don't see the 6 individual tuning bar indicators for UHF that the later varactor sets had.
How does the control panel look on the early varactor Zenith sets you have Doug? Does it have the line of channel numbers with channel up-down switch or is it the single knob? Have never seen one of the horizontal chassis sets with a varactor tuner.
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