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The two thumbwheels for color and tint sound like an RCA CTC-16. Are you sure it was a Zenith? All Zeniths that I can think of, have the color controls behind a door at the bottom right of the TV, at least all the roundies. In the early 70s, Zenith had thumbwheels for volume, color, and tint on the right edge of the panel next to the channel knobs, but those were 25" all-transistor rectangular tube sets.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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