In 1906, Lee De Forest invented the " Audion " triode vacuum tube, an electronic valve that could amplify weak electrical signals.
32.
His most famous invention, in 1906, was the three-element " Audion " ( triode ) vacuum tube, the first practical amplification device.
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The Audion was a considerable improvement on this, but the original devices could not provide any subsequent amplification to what was produced in the signal detection process.
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There he invented the first attempts to avoid infringement of Lee De Forest's audion tube, by means of a Fleming valve with filament and plate.
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""'Metropolitan Suite " "'is an album by electronic music composer Larry Fast, released in 1987 through Audion Records.
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In 1906 Lee De Forest added a third electrode and invented the first electronic amplifying device, the triode, which he named the " Audion ".
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In 1915 Edwin Armstrong developed an improved " regenerative " form of audion receiver that used the same vacuum tube for RF amplification, RF detection and audio amplification.
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In 1908, De Forest filed for a patent ( ) for such a three-electrode version of his original Audion tube for use as an electronic amplifier in radio communications.
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Because of its limited uses and the great variability in the quality of individual units, the grid Audion would be rarely used during the first half-decade after its invention.
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Electrostatic control also underlies the operation of Lee de Forest's Audion ( vacuum tube triode ), patented in 1907 ( U . S . patent 879, 532 ).
