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It seems like RCA has a memory retention circuit as the 1970's/early 80's RCA's with the manual power switch and the keypad do remember the last channel tuned, as long as the set is plugged in. Also I have a 1979 Zenith System 3 w/ultrasonic remote and a long strip of illuminated channel numbers (varactor tuning) and channel up/down controls and this set remembers the last channel tuned...although its technology is different than the true digital tuner.
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