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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.
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.
Audion
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The Audion is 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, consis
Triode
…of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode). 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…
An Audion radio receiver by de Forest. The Audion tubes were mounted upside down to prevent the delicate filaments from sagging and touching the grids
An Audion radio receiver by de Forest. The Audion tubes were mounted upside down to prevent the delicate filaments from sagging and touching the grids. This receiver provided the ability to choose operation of either one of the two provided detector tubes.
Audions and early triodes developed from them, 1918 Bottom row (D): De Forest Audions and oscillaudions Third row (C): Pliotrons, developed at General
Audions and early triodes developed from them, 1918 Bottom row (D): De Forest Audions and oscillaudions Third row (C): Pliotrons, developed at General Electric by Langmuir Second row (B): triodes developed at Western Electric which bought the rights from de Forest in 1913. Top row (A): French triodes. The French government gained the right to manufacture Audions in 1912 when de Forest failed to renew his French patents for lack of $125.
The first Audion AM radio transmitter, built by Lee de Forest and announced April, 1914
The first Audion AM radio transmitter, built by Lee de Forest and announced April, 1914