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De Forest was granted a patent for his early two-electrode diode version of the Audion on November 13, 1906 (U.S. patent 841,386), and the "triode" (three-electrode) version was patented in 1908 (U.S. patent 879,532).
An audion receiver makes use of a single vacuum tube or transistor to detect and amplify signals. It is so called because it originally used the audion tube as the active element. Unlike a crystal detector or Fleming valve detector, the audion provided amplification of the signal as well as detection.
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.
Lee de Forest was born in 1873 in Council Bluffs, Iowa, the son of Anna Margaret (née Robbins) and Henry Swift DeForest. [1] [2] He was a direct descendant of Jessé de Forest, the leader of a group of Walloon Huguenots who fled Europe in the 17th century due to religious persecution.
One miniature thyratron, the triode 6D4, found an additional use as a potent noise source, when operated as a diode (grid tied to cathode) in a transverse magnetic field. [5] Sufficiently filtered for "flatness" (" white noise ") in a band of interest, such noise was used for testing radio receivers, servo systems and occasionally in analog ...
Recreation of the 1907 experiment by H. J. Round on the observation of electroluminescence from a point contact with a carborundum (silicon carbide) crystalIn some later experiments with cat's whisker detectors using a variety of substances, he passed current through them and noticed that some gave off light – the first known report of the effect of the light-emitting diode (LED).
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The text has the residual gas having a negligible effect. The text states that "audion" and "kenotron" are used for the diode. (De Forest 1906 2-electrode audion patent.) It also states that "The names audion and valve are also applied to thermionic tubes with grids." The discussion was in the high-vacuum context.