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Army Radio Training Film “ Electron Theory and the Diode Tube ” Vacuum Tube Electronics 72782 (1942)

1942 · Short film · 15 min

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Synopsis

Made by the U.S. Army in 1942 for radio and electronics technicians, this educational training film shows the diode and the duo diode vacuum tube including the electron sources in the tubes and the symbols which designate varying types. It also breaks down electron behavior in matter and the effect of plate voltage changes. A vacuum tube (:15) and a large water-cooled tube (:19) are shown to be what has enabled continuous progress in radio. A span of various types and sizes follow (:24). A pilot in the cockpit of a bomber aircraft uses radio transmissions in order to stay in communication with units of his squadron as well as with his base (:34). Copper is pointed to and this material is one of many which has conductive properties (:57). Glass is shown as it does not readily conduct electricity and is often used as an insulator (1:03). Voltage is applied to the piece of copper and current flows through it (1:24). Heat is used to accelerate the current (1:43). The filament of a radio tube is heated by electrical current to depict this same action in a tube (2:05). An open filament type tube follows (2:16). The cathode is pointed to which is the sleeve surrounding the tungsten wire (2:41). The plate of the vacuum tube is shown (3:31). A span of military transmitting and receiving sets follow (3:58) with a single radio tube shown as well (4:05). Specific symbols which categorize radio tubes are broken down beginning with the designation of a simple tube (4:23). When plates are…

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Details

Running time
15 minutes
Collection
Ephemeral Films

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