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Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, electrical engineer and an early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier , the three-element " Audion " triode vacuum tube in 1906.
(Includes comments from de Forest.) The Audion: A new Receiver for Wireless Telegraphy, Lee de Forest, Scientific American Supplement No. 1665, November 30, 1907, pages 348-350, Scientific American Supplement No. 1666, December 7, 1907, page 354–356. Lee de Forest's Audion Piano on '120 years Of Electronic Music'
In 1906, Lee De Forest of the US added a control "grid" to the valve to create an amplifying vacuum tube RF detector called the Audion, leading Fleming to accuse him of infringing his patents. De Forest's tube developed into the triode the first electronic amplifier. The triode was vital in the creation of long-distance telephone and radio ...
Developed from Lee De Forest's 1906 Audion, a partial vacuum tube that added a grid electrode to the thermionic diode (Fleming valve), the triode was the first practical electronic amplifier and the ancestor of other types of vacuum tubes such as the tetrode and pentode.
After reading Fleming's 1905 paper on his oscillation valve, American engineer Lee de Forest in 1906 created a three-element vacuum tube, the Audion, by adding a wire grid between cathode and anode. It was the first electronic amplifying device, allowing the creation of amplifiers and continuous wave oscillators.
De Forest is one of the fathers of the "electronic age", as the Audion helped to usher in the widespread use of electronics. [173] De Forest made the Audion tube from a vacuum tube. He also made the "Oscillion", an undamped wave transmitter. He developed the De Forest method of wireless telegraphy and founded the American De Forest Wireless ...
Phonofilm is an optical sound-on-film system developed by inventors Lee de Forest and Theodore Case in the early 1920s. In 1919 and 1920, de Forest, inventor of the audion tube, filed his first patents on a sound-on-film process, DeForest Phonofilm, which recorded sound directly onto film as parallel lines. These parallel lines photographically ...
In 1911–13, Lee De Forest and two assistants worked at Federal Telegraph on the first vacuum tube amplifier and oscillator, which De Forest called the "Oscillaton" after his earlier Audion. California Historical Landmark No. 836 at the corner of Channing and Emerson in Palo Alto, California at the original location of FTC laboratory