In specific applications usually indicated by context. Electronics. A sealed container, evacuated or gas-filled, containing two or more electrodes…
| 单词 | θ78494 |
| 释义 | the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [noun] > vacuum tube or thermionic valve (28) vacuum tube1859 In specific applications usually indicated by context. Electronics. A sealed container, evacuated or gas-filled, containing two or more electrodes… trigger tube1894 a vacuum tube that has two operating states and changes rapidly from one to the other in response to a momentary application of, or change in, a… audion1906 An early form of triode valve, developed by Lee De Forest and used as a detector and amplifier for radio signals. Frequently attributive, as audion… pliotron1915 A high-vacuum thermionic valve with one or more grids between the electrodes. diode1919 (a) A thermionic valve of the simplest kind with just two electrodes, a cathode or ‘filament’ and an anode or ‘plate’. (b) semiconductor diode n. at… electron tube1919 a vacuum tube containing two or more electrodes, such that a current can flow in a controlled way between them; spec. a thermionic valve (= tube, n.… negatron1919 Electronics. A valve with negative resistance, having an anode on one side of the cathode and a second anode and a control grid on the other… pentode1919 A thermionic valve having five electrodes. Also pentode tube, pentode valve. power valve1919 (a) Electronics a thermionic valve designed to deliver a relatively high power; (b) Mechanics a power-operated mechanical valve. tetrode1919 Electronics. A thermionic valve with four electrodes. triode valve1919 A thermionic valve having three electrodes (also triode valve); also, an analogous semiconductor device with three terminals. magnetron1921 A diode with a cylindrical anode surrounding a coaxial cathode in which the flow of current is controlled by a magnetic field applied parallel to… bright emitter1923 a thermionic valve in which the filament operates at a high temperature, and so glows brightly; (also) such a filament; opposed to dull emitter n. at… peanut valve1923 a type of small thermionic triode valve requiring a low current and having a relatively long life. peanut1924 Electronics. = peanut valve n. at compounds 2. Now rare. power tube1924 = power valve n. (a). multiple valve1929 a multi-electrode valve. thyratron1929 A thermionic valve utilizing an arc discharge in mercury vapour or low-pressure gas and having a heated cathode and at least one grid. heptode1932 A valve with seven electrodes. Also attributive. hexode1933 Radio.. A valve with six electrodes. Also attributive or as adj. pentagrid1933 A thermionic valve having five grids; a heptode. Frequently attributive. acorn tube1934 a small high-frequency vacuum tube resembling an acorn in both size and shape. octode1934 A thermionic valve with eight electrodes, used esp. as a frequency changer in a superheterodyne receiver. Now rare. triode-pentode1936 triode-hexode1937 a valve containing a triode and a hexode in a single envelope, with separate anodes but a common cathode. transitron1939 Any device employing a thermionic valve in which a retarding field is used to cause a fall in current through one electrode as the voltage at a… trochotron1947 A type of magnetron in which there are a number of anodes at different angular positions around the central cathode, with the electron beam able… steering diode1957 |
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