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Overview
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.
Score Distribution
Score Distribution
84.3/100
Very Good
90-100
42%(1235)
80-89
28%(824)
70-79
18%(529)
60-69
8%(235)
50-59
3%(88)
0-49
1%(29)
Total Reviews: 2,940Based on user ratings
Details
- Status
- Released
- Runtime
- 22m
- Release Date
- October 20, 1940
- Production
- Production Countries
- United States of America
