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Interestingly for all of RCA and Zenith's clinging to turret tuners for Senior and Discount specials, they were also among the first to offer varactor tuned sets. The first Zenith flatchassis CCII sets in 1972 offered varactor tuning on remote models (one of my Avantis is exactly that), and the 1969 RCA 2000 model offered varactor tuning for VHF.
The big 2 of TV knew how to offer enough variety to appeal to both the tech hungry well to do and those who were cheap or old-fashioned.
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