An electrode, especially in a cathode-ray tube, that produces a beam of accelerated electrons.
The part of an electron tube, esp. a cathode-ray tube, that emits, accelerates, and controls a beam of electrons.
The part of a cathode-ray tube that emits a narrow beam of electrons, consisting of a cathode, control grids, and usually a heater. Electrons are emitted from the cathode, which is typically heated by electric current to give the electrons escape energy. The electrons are then focused into a beam by the electric fields of the control grids.
A device that creates a fine beam of electrons that is focused on a phosphor screen in a CRT.