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Lee de Forest
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Lee de Forest was an American inventor, electrical engineer, and early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier, the three-element "Audion
Lee de Forest c. 1904
Lee de Forest c. 1904
De Forest, some time between 1914 and 1922, with two of his Audions, a small 1-watt receiving tube (left), and a later 250-watt transmitting power tub
De Forest, some time between 1914 and 1922, with two of his Audions, a small 1-watt receiving tube (left), and a later 250-watt transmitting power tube (right), which he called an "oscillion".
American DeForest Wireless Telegraph Company's observation tower, 1904 Louisiana Purchase Exposition at Saint Louis, Missouri
American DeForest Wireless Telegraph Company's observation tower, 1904 Louisiana Purchase Exposition at Saint Louis, Missouri
Ohio Historical Marker: On July 18, 1907, Lee de Forest transmitted the first ship-to-shore messages that were sent by radiotelephone.
Ohio Historical Marker: On July 18, 1907, Lee de Forest transmitted the first ship-to-shore messages that were sent by radiotelephone.
Triode
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A triode is an electronic amplifying vacuum tube consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate.
Lee de Forest
…engineer, and 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 enabled the development of the electronic oscillator. These made radio broadcasting and…
Examples of low power triodes from 1918 (left) to miniature tubes of the 1960s (right)
Examples of low power triodes from 1918 (left) to miniature tubes of the 1960s (right)
ECC83, a dual triode used in 1960-era audio equipment, showing the orange glow of the hot cathode.
ECC83, a dual triode used in 1960-era audio equipment, showing the orange glow of the hot cathode.
3CX1500A7, a modern 1.5 kW power triode used in radio trans­mitters. The cylindrical structure is a heat sink atta­ched to the plate, through which ai
3CX1500A7, a modern 1.5 kW power triode used in radio trans­mitters. The cylindrical structure is a heat sink atta­ched to the plate, through which air is blown during operation.
De Forest Audion tube from 1908, the first triode. The flat plate is visible on the top, with the zigzag wire grid under it. The filament was original
De Forest Audion tube from 1908, the first triode. The flat plate is visible on the top, with the zigzag wire grid under it. The filament was originally present under the grid but was burnt out.