They indicate the state of the tube’s vacuum. Nevertheless, there are a few simple tests that can reveal whether a CRT is at least functional and worth additional effort.įirst, there are one or more circular spots in the tube neck, usually near to the base pins that are created when the CRT is manufactured. Tube-based monitors and TVs can be thoroughly wrung out through the application of test patterns specially constructed for that purpose.īecause CRTs today are mainly for niche needs, tube testers generally can be found used on eBay and perhaps from suppliers of special instruments. This display is from Thomas Electronics, Clyde, N.Y.Ī complete test of a CRT takes a relatively long time and requires a tube tester or a specially built circuit which supplies the many voltages and signals necessary for the CRT. A modern-day CRT display for a military application.
Also, a few perfectionist video gamers still rave about the picture quality of video games displayed on high-end CRTs that are now available on eBay for a song. One consumer application that still requires CRTs is that of monitors for arcade games. General-purpose CRTs are no longer manufactured in the U.S., but factories in China and India still make them - for use in TVs, not computer monitors. For example, some kinds of military needs still require a CRT display.
CRTs have largely been replaced by flat-screen technologies but CRTs still serve in niche applications. The cathode ray tube (CRT) is what made possible TVs, computer monitors, and oscilloscopes as we know them.
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