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Consumer Electronics by S. P. Bali

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MONOCHROME PICTURE TUBE

The cathode ray tube or CRT—as the picture tube is commonly known as (shown in Fig. 30.33) is a large glass structure from which as much air has been evacuated as possible.

At the narrow end (the neck) of the tube is an assembly known as the electron gun. This comprises the elements which emit and control the electron beam just as a machine gun shoots and controls the direction of a stream of bullets.

The wide end (or the face) of the tube may be round or rectangular in shape. A thin coating or fluorescent material called a phosphor is deposited on the inside surface of the face. When a high speed beam, fired from the electron gun, strikes the phosphor, the face of the tube shows a tiny spot of light at the point where ...

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