Also called, especially British, vacuum valve. an electron tube from which almost all air or gas has been evacuated: formerly used extensively in radio and electronics.
a sealed glass tube with electrodes and a partial vacuum or a highly rarefied gas, used to observe the effects of a discharge of electricity passed through it.
Origin of vacuum tube
First recorded in 1775–85
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for vacuum tubeVT
Examples from the Web for vacuum tube
Historical Examples of vacuum tube
This glow is conceived to represent the Aurora, which may consequently be likened to a gigantic exhibition of vacuum-tube lights.
It was only a matter, he said, of transferring a man's habit patterns from brain cells to vacuum-tube cells.
Radiofrequency power is supplied to the dee by a vacuum-tube oscillator.
He guessed that they were housings for vacuum-tube elevator shafts that led to underground caves.
British Dictionary definitions for vacuum tube
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
An electron tube from which all air has been removed. The vacuum ensures transparency inside the tube for electric fields and moving electrons. Most electron tubes are vacuum tubes; cathode-ray tubes, which include television picture tubes and other video display tubes, are the most widely used vacuum tubes. In other electronic applications, vacuum tubes have largely been replaced by transistors.
The American Heritage® Science Dictionary
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