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 ?
The product uses the South Koreans' proprietary vacuum tube and amplifier and the latest DTS[R] Neo fusion codec, also exclusive to Samsung.
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An indifference to maintaining the state-of-the-art technology base in vacuum tube electronics has blunted this essential industry's ability to respond to defense needs over the past 20 years.
Another research team in 1991 reported sealing minuscule emitters inside an evacuated cavity, thus creating a vacuum tube, but it's not as small as the Cambridge tube, Akinwande says.
The VT160 Vacuum Tube Lifter from Anver Corporation features a new Flexi-Head pad attachment that employs two heads with flexible seals that can each articulate 45 degrees to compensate for irregular shaped loads.
Previously embedded proteins suddenly found themselves liberated, electrically charged, and streaming down the mass spectrometer's vacuum tube toward a detector.
Cetron made electronics equipment, including vacuum tubes. on the site.