File:PSM V88 D100 Oscillating electronic vacuum tube.png

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|description={{en|1=Inventor [[:en:Lee De Forest|Lee De Forest]] ''(left)'' and another man experimenting with an [[:en:audion|audion]] amplifier equipment. The Audion tube ''(inset, top)'', the first [[:en:triode|triode]], invented by de Forest in 1906, was the first [[:en:vacuum tube|electron tube]] that could amplify. Its amplifying properties were only discovered around 1910-1912; this picture is from a 1916 Popular Science magazine article which describes its newly-discovered uses as an [[:en:audio amplifier|audio amplifier]], and as an [[:en:electronic oscillator|electronic oscillator]] to produce electronic music. The caption gives a simplified description of how the tube works in a radio receiver: "''In appearance the audion closely resembles an electric light bulb. Built into the bulb are two metal electrodes which are connected in such a way that a perfect electrical balance is maintained between them. When a wireless wave disturbs this balance, the disturbance is heard in the telephone receivers.''" The article doesn't explain what the apparatus in the photo is, but the same picture appearing in the article [http://books.google.com/books?id=VigxAQAAMAAJ&pg=PA340&lpg=PA340 Lee De Forest, ''A Review of Radio'' in ''Broadcast Radio'' magazine (Doubleday, Page, and Co.), Vol. 1, No. 4, August 1922, p.340] is captioned: "''Dr. De Forest measuring the current in circuits employing a large-sized vacuum tube for wireless telephone transmitting.''"}}
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|description={{en|1=Inventor [[:en:Lee De Forest|Lee De Forest]] ''(left)'' and another man experimenting with an early AM [[:en:transmitter|radio transmitter]] using his [[:en:audion|audion]] vacuum tube. The Audion tube ''(inset, top)'', the first [[:en:triode|triode]], invented by de Forest in 1906, was the first [[:en:vacuum tube|electron tube]] that could amplify. Its amplifying properties were only discovered around 1910-1912; this picture is from a 1916 Popular Science magazine article which describes its newly-discovered uses in radio transmitters and receivers, as an [[:en:audio amplifier|audio amplifier]], and as an [[:en:electronic oscillator|electronic oscillator]] to produce electronic music. The caption gives a simplified description of how the tube works in a radio receiver: "''In appearance the audion closely resembles an electric light bulb. Built into the bulb are two metal electrodes which are connected in such a way that a perfect electrical balance is maintained between them. When a wireless wave disturbs this balance, the disturbance is heard in the telephone receivers.''" The article doesn't explain what the apparatus in the photo is, but the same picture appearing in the article [http://books.google.com/books?id=VigxAQAAMAAJ&pg=PA340&lpg=PA340 Lee De Forest, ''A Review of Radio'' in ''Broadcast Radio'' magazine (Doubleday, Page, and Co.), Vol. 1, No. 4, August 1922, p.340] is captioned: "''Dr. De Forest measuring the current in circuits employing a large-sized vacuum tube for wireless telephone transmitting.''"}}
 
|date=1916
 
|date=1916
 
|source= George F. Worts ''Band Concerts from an Electric Light Bulb'' in [http://www.archive.org/details/popularsciencemo88newyuoft ''Popular Science Monthly'', Volume 88, No. 1, January 1916], p. 72
 
|source= George F. Worts ''Band Concerts from an Electric Light Bulb'' in [http://www.archive.org/details/popularsciencemo88newyuoft ''Popular Science Monthly'', Volume 88, No. 1, January 1916], p. 72

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