triode


triode
/truy"ohd/, n. Electronics.
a vacuum tube containing three elements, usually anode, cathode, and control grid.
[1920-25; TRI- + (ELECTR)ODE]

* * *

       electron tube consisting of three electrodes— cathode filament, anode plate, and control grid—mounted in an evacuated metal or glass container. It has been used as an amplifier for both audio and radio signals, as an oscillator, and in electronic circuits. Currently, small glass triodes are used primarily in low-distortion audio amplifiers, while larger triodes, made of metal-ceramics for ruggedness, are used in radio transmitters and in the generation of radio frequency for industrial heating applications.

      The triode is the fundamental form of vacuum tube; variants, such as the tetrode or the pentode, incorporate additional grids. Because of its amplification function, the control grid is generally the most important and critical electrode in a vacuum tube. A small variable voltage applied to the grid can greatly modulate the flow of electrons reaching the plate. The control grid is normally a wire mesh that intercepts little or no current, even though on occasion it may be actually positive relative to the cathode.

* * *


Universalium. 2010.

Look at other dictionaries:

  • triode — [ trijɔd ] n. f. • 1923; de tri , d apr. diode ♦ Phys. Tube électronique possédant trois électrodes (anode, cathode, grille) dans lequel le courant peut être réglé par le potentiel de la grille. Une triode amplificatrice. ● triode nom féminin (de …   Encyclopédie Universelle

  • triode — ► NOUN 1) a thermionic valve having three electrodes. 2) a semiconductor rectifier having three connections. ORIGIN from TRI (Cf. ↑tri ) + ELECTRODE(Cf. ↑electrode) …   English terms dictionary

  • triode — [trī′ōd΄] n. [ TRI + (ELECTR)ODE] an electronic device with three electrodes; esp., an electron tube with an anode, cathode, and grid …   English World dictionary

  • Triode — Eine Elektronenröhre ist ein elektronisches Bauelement, das aus einem evakuierten oder gasgefüllten Kolben aus Glas, Stahl oder Keramik besteht, in den mehrere Elektroden, mindestens eine Kathode mit Heizung und eine Anode, eingelassen und von… …   Deutsch Wikipedia

  • Triode — Pour les articles homonymes, voir Lampe (homonymie). L Audion de Lee De Forest, 1906 …   Wikipédia en Français

  • Triode — A triode is an electronic amplification device having three active electrodes. The term most commonly applies to a vacuum tube (or valve in British English) with three elements: the filament or cathode, the grid, and the plate or anode. The… …   Wikipedia

  • Triode — triodas statusas T sritis fizika atitikmenys: angl. triode vok. Triode, f rus. триод, m pranc. triode, f; tube à trois électrodes, m …   Fizikos terminų žodynas

  • triode — triodas statusas T sritis fizika atitikmenys: angl. triode vok. Triode, f rus. триод, m pranc. triode, f; tube à trois électrodes, m …   Fizikos terminų žodynas

  • Triode — Tri|o|de 〈f. 19〉 Elektronenröhre mit den drei Polen Anode, Kathode u. Steuergitter [<grch. tri... „drei...“ + hodos „Weg“] * * * Tri|o|de, die; , n [zu griech. tri = drei , geb. nach ↑ Diode] (Elektrot.): ↑ Röhre (4 a) mit drei Elektroden. * * …   Universal-Lexikon

  • triode — noun Date: 1919 an electron tube with an anode, a cathode, and a controlling grid …   New Collegiate Dictionary