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the (62), grid (23), plate (22), tube (18), and (13), #suppressor (12), cathode (11), screen (11), vacuum (8), wikipedia (7), this (7), from (7), voltage (7), electrons (7), tubes (6), secondary (6), page (5), with (5), edit (5), contents (4), search (4), pentode (4), emission (4), current (4), other (4), called (4), hide (4), move (4), sidebar (4), view (3), tetrode (3), anode (3), thermionic (3), history (3), also (3), increases (3), between (3), through (3), when (3), oscillations (3), used (3), tools (3), main (3), languages (2), toggle (2), table (2), contact (2), about (2), privacy (2), policy (2), terms (2), was (2), categories (2), short (2), description (2), wikidata (2), electrodes (2), list (2), valve (2), wave (2), output (2), beam (2), hexode (2), control (2), mcgraw (2), hill (2), press (2), isbn (2), references (2), distortion (2), resistance (2), can (2), have (2), amplification (2), more (2), negative (2), potential (2), respect (2), are (2), attracted (2), grids (2), they (2), electrode (2), has (2), dynatron (2), wire (2), suppress (2), appearance (2), upload (2), file (2), changes (2), links (2), read (2), article (2), log (2), create (2), account (2), donate (2), menu (2), add, topic, mobile, cookie, statement, statistics, developers, code, conduct, legal, safety, contacts, disclaimers, text, available, under, additional, may, apply, using, site, you, agree, registered, trademark, non, profit, organization, wikimedia, foundation, inc, use, creative, commons, attribution, sharealike, license, rendered, parsoid, last, edited, december, 2024, utc, hidden, different, articles, retrieved, https, org, index, php, title, suppressor_grid, oldid, 1261913296, sockets, examples, russian, jis, mullard, philips, marconi, osram, retma, rma, numbering, systems, fleming, williams, video, camera, trochotron, traveling, talaria, projector, sutton, storage, selectron, photomultiplier, phototube, monoscope, magnetron, magic, eye, klystron, kinescope, inductive, iconoscope, eidophor, compactron, charactron, deflection, backward, oscillator, additron, ray, nonode, heptode, octode, pentagrid, nuvistor, acorn, triode, audion, diode, types, getter, glowing, space, charge, hot, work, function, theoretical, principles, valves, spangenberg, karl, 1948, terman, frederick, emmons, 1943, 299, 298, radio, engineer, handbook, lee, thomas, 2004, cambridge, university, 0521835267, planar, microwave, engineering, practical, guide, theory, measurement, circuits, okamura, sōgo, 1994, ios, 9051991452, electron, addition, preventing, causing, almost, independent, pentodes, factors, 1000, factor, electrostatic, shielding, prevent, reaching, coarse, wires, interposed, biased, often, connected, inside, glass, repels, back, since, same, primary, problem, passing, emitted, heated, pass, strike, knock, out, metal, surface, four, second, operated, positive, close, during, portions, cycle, below, return, power, supply, flow, away, causes, reduction, words, cause, waveform, amplifier, parasitic, positively, charged, reduces, prevents, located, because, five, concentric, such, were, invented, 1926, phillips, electronics, bernard, tellegen, gilles, holst, antidynatron, free, encyclopedia, item, projects, printable, version, download, pdf, print, export, switch, legacy, parser, get, shortened, url, cite, information, permanent, link, related, what, here, general, actions, english, talk, русский, nederlands, қазақша, français, español, deutsch, català, العربية, top, personal, special, pages, recent, community, portal, learn, help, contribute, random, events, navigation, jump, content,

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suppressor grid wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 references toggle the table of contents suppressor grid 8 languages العربية català deutsch español français қазақша nederlands русский edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia wire screen used to suppress secondary emission in vacuum tubes a suppressor grid is a wire screen used in a thermionic valve i e vacuum tube to suppress secondary emission it is also called the antidynatron grid as it reduces or prevents dynatron oscillations it is located between the screen grid and the plate electrode anode the suppressor grid is used in the pentode vacuum tube so called because it has five concentric electrodes cathode control grid screen grid suppressor grid and plate and also in other tubes with more grids such as the hexode the suppressor grid and pentode tube were invented in 1926 by gilles holst and bernard d h tellegen at phillips electronics 1 2 in a vacuum tube electrons emitted by the heated cathode are attracted to the positively charged plate and pass through the grids to the plate when they strike the plate they knock other electrons out of the metal surface this is called secondary emission 3 4 in the four electrode vacuum tube the tetrode the second grid the screen grid is operated at a positive voltage close to the plate voltage during portions of the cycle when the plate voltage is below the screen grid voltage secondary electrons from the plate are attracted to the screen grid and return to the cathode through the screen grid power supply this flow of electrons away from the plate causes a reduction of plate current when the plate voltage increases in other words the plate has a negative resistance with respect to the cathode this can cause distortion in the plate waveform and parasitic oscillations called dynatron oscillations in an amplifier in the pentode to prevent the secondary electrons from reaching the screen grid a suppressor grid a coarse screen of wires is interposed between the screen grid and plate 3 4 it is biased at the cathode voltage often connected to the cathode inside the glass tube the negative potential of the suppressor with respect to the plate repels the secondary electrons back to the plate since it is at the same potential as the cathode the primary electrons from the cathode have no problem passing through the suppressor grid to the plate in addition to preventing the distortion of plate current the suppressor grid also increases the electrostatic shielding between the cathode and plate causing the plate current to be almost independent of plate voltage 3 this increases the plate output resistance and the amplification factor of the tube 4 pentodes can have amplification factors of 1000 or more 4 references edit okamura sōgo 1994 history of electron tubes ios press pp 17 22 isbn 9051991452 lee thomas h 2004 planar microwave engineering a practical guide to theory measurement and circuits cambridge university press pp 13 14 isbn 0521835267 1 2 3 terman frederick emmons 1943 radio engineer s handbook mcgraw hill pp 298 299 1 2 3 4 spangenberg karl r 1948 vacuum tubes mcgraw hill pp 8 9 v t e thermionic valves theoretical principles thermionic emission work function hot cathode space charge control grid suppressor grid anode glowing anode getter types diode audion triode acorn tube nuvistor tetrode beam tetrode pentode pentagrid hexode heptode octode nonode cathode ray tube additron backward wave oscillator beam deflection tube charactron compactron eidophor iconoscope inductive output tube kinescope klystron magic eye magnetron monoscope phototube photomultiplier selectron tube storage tube sutton tube talaria projector traveling wave tube trochotron video camera tube williams tube fleming valve numbering systems rma retma marconi osram mullard philips jis russian examples list of vacuum tubes list of tube sockets retrieved from https en wikipedia org w index php title suppressor_grid oldid 1261913296 categories vacuum tubes electrodes hidden categories articles with short description short description is different from wikidata this page was last edited on 8 december 2024 at 16 58 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents suppressor grid 8 languages add topic