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The filament's connecting and supporting wires are visible. The plate is at the middle top, and the grid is the serpentine electrode below it. The plate and grid connections leave the tube at the right. The Audion was an electronic detecting or amplifying vacuum tube [1] invented by American electrical engineer Lee de Forest as a diode in 1906.
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.
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.
The audion was invented by Lee De Forest. In 1914 Edwin Armstrong described the audion receiver. [1] In 1915 he described some regenerative audion receivers. [2] Fig.3 shows the audion, Fig. 8 the tickler coil regenerative audion and Fig. 9 the Miller effect regenerative audion. All circuits use one tube for RF amplification, RF demodulation ...
The earliest tubes, like the Deforest Spherical Audion [3] from c. 1911, used the typical light bulb Edison socket for the heater, and flying leads for the other elements. Other tubes directly used flying leads for all of their contacts, like the Cunningham AudioTron from 1915, [4] or the Deforest Oscillion. [5]
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The reason GE was interested was that it needed a modulator for the Alexanderson alternator. By 1913 Alexanderson had made alternators that produced several kW at up to 200kHz. They tried a generator with its field excited by the microphone, magnetic amplifier, and a 3 electrode mercury arc tube, without success.
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