Cathode ray tubes show the TV picture
Cathode Ray Tubes (CRTs)
The television picture tube that displays the picture is properly called a cathode ray tube (CRT). The CRT is a large glass vacuum tube. The inside front of the tube is covered with a phosphorescent substance that glows when struck by a beam of electrons — the stronger the beam of electrons, the brighter the glow; the weaker the electron beam, the less the glow. At the back of the CRT, in the narrow neck, is an electron gun (a cathode that is heated) that emits a beam of electrons — the higher the voltage activating the gun, the stronger the electron beam; the weaker the voltage, the weaker the beam. The direction of the electron beam is controlled by the deflection yoke (a group ...
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