Dynatron

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...
Found on http://en.wikipedia.org/wiki/Dynatron

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 ...
Found on http://www.britannica.com/eb/a-z/d/88

dynatron

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.
Found on http://www.wordinfo.info/words/index/info/view_unit/2190/2
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