The movie FREQUENCY with Dennis Quaid from 1999 had a 64 or 65 Zenith roundie in it. There were several good shots of it operating. There were also a lot of other vintage sets in the movie. And for the HAM operators, there's an old radio that they talk on... showing the tubes glowing nice and bright.
The story line is great, passing back and forth between 1969 and 1999 via the ham radio.
If you haven't seen this one, pick it up next time you're at the rental place. It's certainly worth watching.