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.
Genre: Documentary
Stars: Lowell Thomas
Crew:
Country: United States of America
Language:
Studio: Audio Productions Inc.
Runtime: 22 minutes
Quality: HD
Released: Oct 20, 1940
IMDb: 10
Keywords:
