pentode

pentode
/pen"tohd/, n. Electronics.
a vacuum tube having five electrodes, usually a plate, three grids, and a cathode, within the same envelope.
[1915-20; PENT- + -ODE2]

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      vacuum-type electron tube with five electrodes. Besides the cathode filament, anode plate, and control grid of the triode and the added screen grid of the tetrode, there is still another grid (suppressor grid) placed between the screen grid and the anode plate and maintained at cathode potential. Thus, any electrons emitted from the plate surface by secondary emission (electron tube) are repelled back to the plate. The pentode can be used for almost all purposes for which vacuum tubes are used, including amplification, mixing, oscillation, and pulse generation, and in circuits for timing, control, and counting. Today pentode tubes are primarily used in audio amplifiers (amplifier), because they generate less noise than solid-state components.

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Universalium. 2010.

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  • pentode — [pen′tōd΄] n. [ PENT(A) + ODE1] an electron tube containing five electrodes, usually a cathode, anode, and three grids: used as a voltage amplifier …   English World dictionary

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  • Pentode — A pentode is an electronic device having five active electrodes. The term most commonly applies to a three grid vacuum tube, which was invented by the Dutchman Bernhard D.H. Tellegen in 1926. (Please see reference.) Advantages over the tetrode A… …   Wikipedia

  • Pentode — pentodas statusas T sritis fizika atitikmenys: angl. pentode vok. Fünfpolröhre, f; Pentode, f rus. пентод, m pranc. pentode, f …   Fizikos terminų žodynas

  • pentode — pentodas statusas T sritis fizika atitikmenys: angl. pentode vok. Fünfpolröhre, f; Pentode, f rus. пентод, m pranc. pentode, f …   Fizikos terminų žodynas

  • Pentode — Pent|o|de auch: Pen|to|de 〈f. 19; El.〉 Fünfpolröhre, Elektronenröhre mit Kathode, Anode, Steuer , Schirm u. Bremsgitter [<grch. pente „fünf“ + hodos „Weg“] * * * Pen|t|o|de, die; , n [zu griech. pénte = fünf u. ↑ Elektrode] (Elektrot.): ↑… …   Universal-Lexikon

  • Pentode transistor — A pentode transistor is any transistor having five active terminals.Early pentode transistorsOne early pentode transistor was developed in the early 1950s as an improvement over the point contact transistor. *A point contact transistor having… …   Wikipedia

  • pentode — noun a thermionic valve similar to a tetrode with the addition of a suppressor grid; was used in high quality audio and radio products …   Wiktionary

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