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Vacuum: Vacuum Tube, Vacuum Pump, Pressure Measurement, Chemical Vapor Deposition, Turbopump, Vacuum Flask, Cold Cathode, Oute |
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The electrodes are attached to leads which pass through the envelope via an airtight seal. The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air. More: http://booksllc.net/?id=32496 A vacuum tube consists of electrodes in a vacuum in an insulating heat-resistant envelope which is usually tubular. Almost all tubes depend on the thermionic emission of electrons. Some special function vacuum tubes are filled with low-pressure gas: these are so-called soft tubes as distinct from the hard vacuum type which have the internal gas pressure reduced as far as possible. Chapters: Vacuum Tube, Vacuum Pump, Pressure Measurement, Chemical Vapor Deposition, Turbopump, Vacuum Flask, Cold Cathode, Outer Space, Manifold Vacuum, Dirac Sea, Ultra High Vacuum, Helium Mass Spectrometer, Beamline, Vacuum Flange, Hot Filament Ionization Gauge, Outgassing, Vacuum Deposition, Vacuum Coffee Maker, Vacuum Packing, Molecular Sieve, Aspirator, Pneurop, Mcleod Gauge, Thin-Film Thickness Monitor, Suction, Vacuum Evaporation, Vacuum Furnace, Suction Cup, Frans Michel Penning, Vacuum Consolidation, Vacuum Chamber, Bell Jar, Jet Aerators, Bake-Out, Nilfisk Cfm, Foreline, Thermal Vacuum Chamber, Vacuum Cementing, Vacuum Grease, Vacuum Induction Melting. Excerpt: In electronics, a vacuum tube, electron tube (in North America), thermionic valve (elsewhere, especially in Britain) is a device used to amplify, switch, otherwise modify, or create an electrical signal by controlling the movement of electrons in a low-pressure space. When hot,... Many tubes have glass envelopes, though some types such as power tubes may have ceramic or metal envelopes. On most tubes, the leads are designed to plug into a tube socket for easy replacement. |