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Originally Posted by MikeFromHC
Aside from sharing the EMF spectrum I don't think TV was an add on to radio (or to X-ray machines and microwaves)
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Wrong. A TV signal is simply pictures encoded in radio waves, and a TV receiver is a device to recreate those pictures by decoding the radio waves (until recently, via a big vacuum tube). It is absolutely an add-on to radio.
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Our ability to produce vacuum tubes has been essentially lost and we would have to start over again if the need arose.
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Wrong. Vacuum tubes are still produced on a regular basis. There are also still entire books of instructions on how to design tubes, not to mention pre-existing designs. It would probably be easier to hire a competent vacuum tube designer than a competent buggy whip maker, let alone a flint knapper.
Old movies were not lost because of their format; they were lost because the film CAUGHT FIRE or FELL APART, or was never saved at all. Let's not even go into what the Time executives did when they bought Warner Brothers. Physical disintegration affects old films, old data tapes ... and old books.