thermionic tube
111Scanning electron microscope — These pollen grains taken on an SEM show the characteristic depth of field of SEM micrographs …
112Transistor — For other uses, see Transistor (disambiguation). Assorted discrete transistors. Packages in order from top to bottom: TO 3, TO 126, TO 92, SOT 23 A transistor is a semiconductor device used to amplify and switch electronic signals and power. It… …
113Sound recording and reproduction — Sound recorder redirects here. For the audio recording program computer software, see Sound Recorder (Windows). Sound recording and reproduction is an electrical or mechanical inscription and re creation of sound waves, such as spoken voice,… …
114Ultra-Linear — is a term used to describe a type of electronic circuit that is used to couple a tetrode or pentode vacuum tube (also called electron valve ) to a load (e.g. to a loudspeaker).The circuit was developed by Alan Blumlein and patented in 1937 (… …
115Caesium — xenon ← caesium → barium Rb ↑ Cs ↓ Fr …
116Grid leak — is the small current through the grid of a thermionic valve into the circuit which feeds the grid. It is an inherent operating characteristic of triodes and other vacuum tubes.This current is caused by the small negative EMF which is present in… …
117Miniature valve — The miniature thermionic valve (vacuum/electron tube) is a development of the older style of thermionic valve in which the pins for connecting the valve to circuitry were mounted in a Bakelite base, into which the valve envelope ( bulb ) was… …
118Fleming , Sir John Ambrose — (1849–1945) British physicist and electrical engineer Fleming, who was born at Lancaster, studied for a short time at University College, London, but left before graduating. However, he continued his work for a science degree in his leisure hours …
119thermion — n. ion emitted by incandescent object or substance. ♦ thermionic, a. ♦ thermionic ♦ valve, vacuum tube with several electrodes cathode, anode, and grid(s) the heated cathode emitting electrons …
120thoriate — verb impregnate with thorium oxide to increase thermionic emission • Derivationally related forms: ↑thorium • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑impregnate, ↑saturate …
