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Federal law required in 1975 that all TVs be equipped with detent tuners for both UHF and VHF, so the set shown in your Sams schematic is likely, almost certainly, post-'75; however, the TV you have was made before the ruling took effect. The law was enacted because many people found it difficult to accurately tune in UHF channels on sets having continuous UHF tuners.
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Jeff, WB8NHV
Collecting, restoring and enjoying vintage Zenith radios since 2002
Zenith. Gone, but not forgotten.
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