noun
electron tube; vacuum tube
Technical term used in electronics; refers to a device that controls electric current through a vacuum or gas.
古いラジオには電子管が使われている。
Old radios use electron tubes.
電子管はトランジスタに置き換えられた。
Electron tubes were replaced by transistors.
A transistor is a semiconductor device that largely replaced electron tubes in modern electronics.
Compound of 電子 (electron) and 管 (tube).