Akademik

electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

↑acorn tube, ↑diode, ↑rectifying tube, ↑rectifying valve, ↑electron multiplier, ↑gas-discharge tube, ↑klystron, ↑magnetron, ↑pentode, ↑television-camera tube, ↑television pickup tube, ↑tetrode, ↑triode, ↑X-ray tube

See vacuum tube.

[1915-20]

thermionic valve or thermionic tube noun

A vacuum tube containing a heated cathode from which electrons are emitted, an anode for collecting some or all of these electrons and, generally, additional electrodes for controlling their flow to the anode

Main Entry: ↑thermion

thermionic valve,

Especially British. vacuum tube.