Noun
vacuum tube (plural vacuum tubes)
(electronics) A type of electron tube that controls electron current through vacuum between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used.
Absolute gravimeters, which nowadays can also be used in the field, are based directly on measuring the acceleration of free fall (for example, of a reflecting prism in a vacuum tube). Source: Internet
Accelerating light ions is relatively easy, and can be done in an efficient manner—all it takes is a vacuum tube, a pair of electrodes, and a high-voltage transformer; fusion can be observed with as little as 10 kV between electrodes. Source: Internet
After the introduction of the more reliable and amplified vacuum tube based radios, the cat's whisker systems quickly disappeared. Source: Internet
Cathode ray tubes main The cathode ray tube (CRT) is a vacuum tube used particularly for display purposes. Source: Internet
Although a vacuum tube might fail, it would be replaced without bringing down the system. Source: Internet
A once-popular form of this instrument used a vacuum tube in the amplifier circuit and so was called the vacuum tube voltmeter, or VTVM. Source: Internet