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Lee de Forest, American inventor, invented the audion tube (born 1873)
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Lee de Forest
American inventor (1873–1961)
Lee de Forest 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 1908. This helped start the Electronic Age, and…Source: Wikipedia (CC BY-SA)
Audion
Electronic detecting or amplifying vacuum tube
The Audion was an electronic detecting or amplifying vacuum tube invented by American electrical engineer Lee de Forest as a diode in 1906. Improved, it was patented as the first triode in 1908, consisting of an evacuated glass tube containing three electrodes: a heated…Source: Wikipedia (CC BY-SA)