Examples of low power triodes from 1918 (left) to miniature tubes of the 1960s (right)
Single-grid amplifying vacuum tube having three active electrodes
This article is about the electronic vacuum tube. For the Eastern Orthodox structure of hymns, see Triodion.
ECC83, a dual triode used in 1960-era audio equipment
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.
A triode is an electronic amplifying vacuum tube (or thermionic valve in British English) consisting 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 the ancestor of other types of vacuum tubes such as the tetrode and pentode. Its invention helped make amplified radio technology and long-distance telephony possible. [1] Triodes were widely used in consumer electronics devices such as radios and televisions until the 1970s, when transistors replaced them. Today, their main remaining use is in high-power RF amplifiers in radio transmitters and industrial RF heating devices. In recent years there has been a resurgence in demand for low power triodes due to renewed interest in tube-type audio systems by audiophiles who prefer[vague] the sound of tube-based electronics.[citation needed]
The name "triode" was coined by British physicist William Eccles[2][3] some time around 1920, derived from the Greek τρίοδος, tríodos, from tri- (three) and hodós (road, way), originally meaning the place where three roads meet.
^Cite error: The named reference Nebeker was invoked but never defined (see the help page).
^Turner, L. B. (1921). Wireless Telegraphy and Telephony. Cambridge University Press. p. 78. ISBN 110762956X.
^Ginoux, Jean-Marc; Rosetto, Bruno, "The Singing Arc: The oldest memrister?" in Adamatzky, Andrew; Chen, Guanrong (2013). Chaos, CNN, Memristors and Beyond. World Scientific. p. 500. ISBN 978-9814434812.
A triode is an electronic amplifying vacuum tube (or thermionic valve in British English) consisting of three electrodes inside an evacuated glass envelope:...
53 Dual Triode Audio Output. Another early type of multi-section tube, the 6SN7, is a "dual triode" which performs the functions of two triode tubes while...
or pentode, and triode K – Small gas triode or tetrode thyratron L – Single or dual triode, including oscillator triode LD – Triode and diode(s) ME –...
in the case of digital circuits. The transistor replaced the vacuum-tube triode, also called a (thermionic) valve, which was much larger in size and used...
12AX7 (also known as ECC83) is a miniature dual-triode 6AV6 vacuum tube with high voltage gain. Developed around 1946 by RCA engineers in Camden, New Jersey...
such as the PL36, 27GB5/PL500, PL505 etc. A "triode-pentode" is a single envelope containing both a triode and a pentode, such as an ECF80 or ECL86. The...
The type 955 triode "acorn tube" is a small triode thermionic valve (vacuum tube in USA) designed primarily to operate at high frequency. Although data...
miniature nine-pin (B9A base) medium-gain dual-triode vacuum tubes. It belongs to a large family of dual-triode vacuum tubes which share the same pinout (RETMA...
entirely of metal with a ceramic base. Triodes and a few tetrodes were made; Nuvistor tetrodes were taller than their triode counterparts. Nuvistors are among...
A double diode triode is a type of electronic vacuum tube once widely used in radio receivers. The tube has a triode for amplification, along with two...
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:...
in N-JFET due to a small voltage VDS (that is, in the linear or ohmic or triode region) is given by treating the channel as a rectangular bar of material...
built from them are quite slow compared to electronic devices. The fluidic triode, an amplification device that uses a fluid to convey the signal, has been...
who simply put two grids into what would otherwise have been an ordinary triode valve (the bi-grille or bi-grid). Although technically a four electrode...
The 5965 is a miniature twin triode vacuum tube (thermionic valve). One of its manufacturers, Sylvania, states that it was “designed for use in high-speed...
unit area. The transition from the exponential subthreshold region to the triode region is not as sharp as the equations suggest.[verification needed] When...
6SN7 is a dual triode vacuum tube with an eight-pin octal base. It provides a medium gain (20 dB). The 6SN7 is basically two 6J5 triodes in one envelope...
IRE medal of honor "For his early work on oscillating circuits employing triode tubes and likewise for his early recognition and clear exposition of the...
electrode used in amplifying thermionic valves (vacuum tubes) such as the triode, tetrode and pentode, used to control the flow of electrons from the cathode...
signal. The first practical electrical device which could amplify was the triode vacuum tube, invented in 1906 by Lee De Forest, which led to the first amplifiers...
additional grid to the first amplifying vacuum tube, the triode, to correct limitations of the triode. During the period 1913 to 1927, three distinct types...
definition. Active components include amplifying components such as transistors, triode vacuum tubes (valves), and tunnel diodes. Passive components cannot introduce...
is a classic push–pull front end, typically followed by a driver (triode) and (triode or pentode) output stage (in ultra linear in many cases) to form...
The early Audion (triode) tube is visible at right. One of the BBC's first broadcast transmitters, early 1920s, London. The 4 triode tubes, connected in...
ISSN 0024-6107. B. van der Pol: "A theory of the amplitude of free and forced triode vibrations", Radio Review (later Wireless World) 1 701–710 (1920) van der...
practical amplifying electrical component, the triode vacuum tube (or "valve" in British English) in 1907. The triode was a three-terminal device with a control...
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