TUBE 833A

The 833-A is the famous high-power, air-cooled triode with a maximum plate dissipation of 450 watts (ICAS). It is designed for use as an r-f amplifier, class B modulator, and oscillator. The 833-A is similar in appearance to its well known predecessor, the 833, but utilizes a Zirconium-coated anode and includes many other processing refinements. In existing equipment using the former 833, the 33-A can be used to boost power substantially by improving forced-air-cooling. Small and compact, the 833-A will handle several kilowatts of power in a tube less than 9 inches high and 4-5/8 inches in diameter. For example, with forced air cooling it will take maximum input of 1800 watts (ICAS) in plate-modulated service and 2,000 watts input (ICAS) on c.w.- at frequencies as high as 20 Mc. Under CCS ratings with natural cooling, the tube will take a maximum input of 1250 watts at frequencies as high as 30 megacycles! The 833-A is designed with post terminals that provide a rugged structure and make bases unnecessary. The Zirconium-coated anode is supported direct from its post terminal at the top of the bulb. The 100-watt thoriated-tungsten filament of the 833-A has a tremendous reserve of emission. This filament is shielded by means of a special plate construction to conserve input power by eliminating bulb bombardment and stray electrons. Designed to meet the specification requirements of commercial high-power, high-frequency applications, The 833-A is built to last.