vacuum tube
device that controls electric current between electrodes in an evacuated container
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A vacuum tube is a device that controls electric current flowing between electrodes inside a sealed container from which air has been removed. Vacuum tubes were essential for early electronic technologies like radios and televisions, and they remain important in specialized applications today.
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Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. It takes the form of an evacuated tubular envelope of glass or sometimes metal containing electrodes connected to external connection pins.