Principles of radio. Part 3. The Vacuum tube

United States, 1943

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Explains by animated drawings, the operation of a radio vacuum tube in terms of its filament, plate, and grid circuits. Illustrates the three functions of the vacuum tube in 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.


production company

Encyclopaedia Britannica Films

ERPI Classroom Films



Production places
United States
Production dates

Collection metadata

ACMI Identifier




Subject categories

Advertising, Film, Journalism, Mass Media & TV → Radio

Advertising, Film, Journalism, Mass Media & TV → Radio frequency

Advertising, Film, Journalism, Mass Media & TV → Radio waves

Communications, Infrastructure, & Transport → Radio waves


Documentary → Documentary films - United States

Educational & Instructional

Educational & Instructional → Educational films

Educational & Instructional → Instructional

Mathematics, Science & Technology → Oscillators, Audio-frequency

Mathematics, Science & Technology → Physics

Mathematics, Science & Technology → Radio waves

Mathematics, Science & Technology → Science

Mathematics, Science & Technology → Vacuum

Short films

Short films → Short films - United States




Black and White


16mm film; Access Print (Section 1)

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