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The Braun tube became the foundation of 20th century TV. [ 15 ] In 1908, Alan Archibald Campbell-Swinton , fellow of the Royal Society (UK), published a letter in the scientific journal Nature , in which he described how "distant electric vision" could be achieved by using a cathode-ray tube (or "Braun" tube) as both a transmitting and ...
About 8% by weight of cathode-ray tubes is strontium oxide, which has been the major use of strontium since 1970. [3] [4] Color televisions and other devices containing color cathode-ray tubes sold in the United States are required by law to use strontium in the faceplate to block X-ray emission (these X-ray emitting TVs are no longer in production).
Terbium oxide is used in fluorescent lamps and television and monitor cathode-ray tubes (CRTs). Terbium green phosphors are combined with divalent europium blue phosphors and trivalent europium red phosphors to provide trichromatic lighting technology, a high-efficiency white light used in indoor lighting.
For example, europium(III) oxide can be used in picture tube televisions [67] and europium-doped yttrium oxysulfide (Y 2 O 2 S:Eu 3+) can be used as phosphors. [68] In addition, europium compounds can also be used in the manufacture of anti-counterfeiting materials. [69]
Such a tube can also be used for detection of ionizing radiation as an alternative to the Geiger–Müller tube (itself not an actual vacuum tube). Historically, the image orthicon TV camera tube widely used in television studios prior to the development of modern CCD arrays also used multistage electron multiplication.
Thorium oxide may be used as well. Oxide-coated cathodes operate at about 800-1000 °C, orange-hot. They are used in most small glass vacuum tubes, but are rarely used in high-power tubes because the coating is degraded by positive ions that bombard the cathode, accelerated by the high voltage on the tube. [4]
Historically, it was once widely used in the red phosphors in television set cathode ray tube displays. [9] Yttrium is also used in the production of electrodes, electrolytes, electronic filters, lasers, superconductors, various medical applications, and tracing various materials to enhance their properties. Yttrium has no known biological role.
An octal type used in color television sets. The heater power is 3.6 volts and 0.225 amps. 3CN3 - High Voltage rectifier. An octal type used in color television sets. The heater power is 3.15 volts and 0.48 amps. The large current is for the advantage of fast warm-up. 3CU3 - High Voltage rectifier. An octal type used in color television sets.