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tube

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tube

Or electron tube in electronics, a glass tube containing gas at low pressure, which is used to control the flow of electricity in a circuit. The electron tube valve was invented by US radio engineer Lee de Forest (1873–1961). Three or more metal electrodes are inset into the tube. By varying the voltage on one of them, called the grid electrode, the current through the tube can be controlled, and the tube can act as an amplifier.

Tubes have been replaced for most applications by transistors. However, they are still used in high-power transmitters and amplifiers, and in some hi-fi systems.



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? Mentioned in ? References in classic literature
 
Immediately the operation of boring was commenced; and by the aid of powerful machines, a few weeks later, the inner surface of the immense tube had been rendered perfectly cylindrical, and the bore of the piece had acquired a thorough polish.
From The Earth To The Moon by Verne, Jules View in context
A similar tube was handed to each of the three, and the seven proceeded to distribute themselves at equal distances along a curved line between St.
The War Of The Worlds by Wells, H.G. View in context
How now, he soliloquized at last, withdrawing the tube, this smoking no longer soothes.
Moby Dick I-LXVII by Melville, Herman View in context
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