vacuum tube

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vac·uum tube

a glass tube from which the air has been removed, containing two or more electrodes, between which passes an electrical current or spark; used in the production of x-rays, or to control circuits. Previously in wide use, the vacuum tube has been supplanted by transistors in electronic circuits.
Farlex Partner Medical Dictionary © Farlex 2012

vacuum tube

A vessel of insulating material (usually glass) that is sealed and has a vacuum sufficiently high to permit the free flow of electrons between the electrodes that extend into the tube from the outside. In England, it is called a vacuum valve.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
(7.) Birnbach, C., and Kappenman, J., "High Power Cold Cathode Electron Tubes for Power Electronics Applications," EPRI HVDC & FACTS Conference Proceedings, August 2011.
Paris, France 8/23/05 -- Photonis Holding SAS has acquired Burle Industries, a manufacturer of specialized electron tubes and electro-optic products, including photomultiplier tubes, Channeltron mass spectrometry detectors and advanced performance detectors.
The chapter Circuits Based on Semiconductor Devices, after a brief mention of electron tubes, covers the most important semiconductor devices, diodes and transistors, and their applications such as oscillators, small signal, low-noise and power amplifiers, reflection amplifiers, frequency converters and multipliers as well as detectors.
The five businesses are home electric appliances, information technology solutions, medical systems, materials and components and electron tubes.
Historically, especially in the early days of electron tubes, vacuum practitioners were concerned with "clean-up" of the residual gases and needed to "get" them.
This part of the group specialises in semi-conductors, passive components, electron tubes and electromechanical components, with annual sales of pounds 4billion and a 47,000-strong workforce.
and Thomson Electron Tubes and Devices Corporation.
Cade's company, which sells such components as electron tubes and fiber-optic conductors to AT&T and the federal government, grossed $800,000 in sales last year.
At Bell Labs he worked primarily on electron tubes. Particularly notable was his work on space charge between parallel electrodes and his wartime work on the TR-box--a switch that disconnects the receiver of a radar when the radar is transmitting and prevents the sensitive receiver from being destroyed by the high-power transmitter.

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