The dynatron was a specialized vacuum tube invented in 1918 by Albert Hull at General Electric laboratories for use as an electronic oscillator to produce radio waves. It has three electrodes: a thermionic cathode consisting of a heated filament, an anode consisting of a perforated plate, and a supplementary anode or plate. Due to the phenomenon o...
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http://en.wikipedia.org/wiki/Dynatron
(from the article `tetrode`) A special form of tetrode was the dynatron, a vacuum tube that was operated with screen-grid voltage higher than plate voltage so that the tube ...
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http://www.britannica.com/eb/a-z/d/88
dynatron 1. A vacuum tube device which has three electrodes: a thermionic cathode, a perforated anode, and a supplementary anode or plate. 2. A multi-electrode thermionic valve often used as an oscillator.
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http://www.wordinfo.info/words/index/info/view_unit/2190/2
a tetrode, once frequently used as an oscillator in radio, in which an increase in the plate voltage results in a decrease in the plate current because of emission of electrons from the plate.
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https://www.infoplease.com/dictionary/dynatron
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