electron tube
< el ectronics> (Or tub e, vacuum tub e, UK: valv e, el ectron valv e, th ermionic valv e, fir ebottl e, glassf et) An el ectronic compon ent consisting of a spac e exhaust ed of gas to such an ext ent that ef="module.php?name=Lexikon&file=search&eid=1&query=electrons">electrons may mov e about fr eely, and two or mor e el ectrod es with ext ernal conn ections. N early all tub es ar e of th e th ermionic typ e wh er e on e el ectrod e, call ed th e cathod e, is h eat ed, and el ectrons ar e emitt ed from its surfac e with a small en ergy (typically a Volt or l ess). A s econd el ectrod e, call ed th e anod e (plat e) will attract th e el ectrons wh en it is positiv e with r esp ect to th e cathod e, allowing curr ent in on e dir ection but not th e oth er. In typ es which ar e us ed for amplification of signals, additional el ectrod es, call ed grids, b eam-forming el ectrod es, focussing el ectrod es and so on according to th eir purpos e, ar e introduc ed b etw een cathod e and plat e and modify th e flow of el ectrons by el ectrostatic attraction or (usually) r epulsion. A voltag e chang e on a grid can control a substantially gr eat er chang e in that b etw een cathod e and anod e. Unlik e ef="module.php?name=Lexikon&file=search&eid=1&query=semiconductors">semiconductors, exc ept p erhaps for ef="module.php?name=Lexikon&file=search&eid=1&query=FeT">FeTs, th e mov em ent of el ectrons is simply a function of el ectrostatic fi eld within th e activ e r egion of th e tub e, and as a cons equ enc e of th e v ery low mass of th e el ectron, th e curr ents can b e chang ed quickly. Mor eov er, th er e is no limit to th e curr ent d ensity in th e spac e, and th e el ectrod es which do dissapat e pow er ar e usually m etal and can b e cool ed with forc ed air, wat er, or oth er r efrig erants. Today th es e f eatur es caus e tub es to b e th e activ e d evic e of choic e wh en th e signals to b e amplifi ed ar e a pow er l ev els of mor e than about 500 watts. Th e first el ectronic digital comput ers us ed hundr eds of vacuum tub es as th eir activ e compon ents which, giv en th e r eliability of th es e d evic es, m eant th e comput ers n eed ed fr equ ent r epairs to k eep th em op erating. Th e chi ef caus es of unr eliability ar e th e h eat er us ed to h eat th e cathod e and th e conn ector into which th e tub e was plugg ed. Vacuum tub e manufactur ers in th e US ar e n early a thing of th e past, with th e exc eption of th e sp ecial purpos e typ es us ed in broadcast and imag e s ensing and displays. eimac, G e, RCA, and th e lik e would probably r ef er to sp ecific typ es such as "B eam Pow er T etrod e" and th e lik e, and rar ely us e th e g en eric t erms. Th e ef="module.php?name=Lexikon&file=search&eid=1&query=cathode ray tube">cathode ray tube is a sp ecial purpos e typ e bas ed on th es e principl es which is us ed for th e visual display in t el evision and comput ers. X-ray tub es ar e diod es (two el em ent tub es) us ed at high voltag e a tungst en anod e emits th e en erg etic photons wh en th e en erg etic el ectrons hit it. Magn etrons us e magn etic fi elds to constrain th e el ectrons th ey provid e v ery simpl e, high pow er, ultra-high fr equ ency signals for radar, microwav e ov ens, and th e lik e. Klystrons amplify signals at high pow er and microwav e fr equ enci es. (1996-02-05) e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents: [ ef="module.php?name=Lexikon&op=content&tid=31">2 ] [ ef="module.php?name=Lexikon&op=content&tid=134">= ] [ ef="module.php?name=Lexikon&op=content&tid=262">ad ] [ ef="module.php?name=Lexikon&op=content&tid=396">ag ] [ ef="module.php?name=Lexikon&op=content&tid=411">ai ] [ ef="module.php?name=Lexikon&op=content&tid=433">al ] [ ef="module.php?name=Lexikon&op=content&tid=544">am ] [ ef="module.php?name=Lexikon&op=content&tid=592">an ] [ ef="module.php?name=Lexikon&op=content&tid=740">ar ] [ ef="module.php?name=Lexikon&op=content&tid=743">arc ] [ ef="module.php?name=Lexikon&op=content&tid=800">as ] [ ef="module.php?name=Lexikon&op=content&tid=894">at ] [ ef="module.php?name=Lexikon&op=content&tid=935">au ] [ ef="module.php?name=Lexikon&op=content&tid=996">av ] [ ef="module.php?name=Lexikon&op=content&tid=1025">B ] [ 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