# Vacuum Tubes

Explains by animated drawings, the operation of a radio vacuum tube in terms of its filament, plate, and grid circuits. Illustrates three functions of the vacuum tube in the radio: how it serves as an amplifier to operate the loud-speaker, as a rectifier in detection, and as an oscillator to generate the carrier wave.

- Kind: Educational
- Year: 1943
- Runtime: 10 min
- By: Encyclopaedia Britannica Films, Inc.
- Genres: Education, Science
- Archive: [Internet Archive](https://archive.org/details/TheVacuumTubeInRadio)
- Licence or status: none stated by the archive
- Who can watch: Kids profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/TheVacuumTubeInRadio?play=1)