Storyline
With Western Electric Vacuum Tubes in the starring roles, this film tells the fascinating story of tube development from the first crude bulbs of Edison and De Forest to the powerful and efficient tubes in use today, and shows the prominent part they play in radio, long-distance telephony, public address systems, sound motion pictures and the phonograph.
Released
20 October 1940
Runtime
22min
Genre
Status
Released
Language
English
Production
Audio Productions Inc.
Cast
