(British thermionic valve)
An electron tube giving a unidirectional flow of electrons emitted from a hot cathode, used especially in the rectification of a current and in radio reception.
- It's rather odd therefore that even though we ditched thermionic valves for transistors and integrated circuits many years ago, the cathode ray tube has remained the most cost-effective display system.
- The speaker or singer uses a microphone feeding into the above-mentioned amplifier, which incorporates vacuum tubes (thermionic valves).
- The basic thermionic tube with three electrodes is called a triode in view of the number of electrodes.
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