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In 1911 the American physicist Charles D. Coolidge proposed use as a cover the tungsten filament of thorium oxide – oxide cathode – and received a tungsten wire, which made a revolution in the lamp industry.
In 1915 the American physicist Irving Langmuir designed a two-electron tube – valve tube used as a rectifier tubes in power supplies. In 1916 the lamp industry began to produce a special type of construction lamps – Power tube with water cooling.
The idea of the lamp with two weaving – tetrode was made in 1919 by German physicist Walter Schottky, and independently of him in 1923 – American William E. Hull, and implemented this idea Englishman HJ. Round in the second half of the 20’s, Mr. . g.
In 1929, Dutch scientists G. Holst and B. Tellegen set up an electronic lamp with 3 screens – Pentode. In 1932 it was established geptod, in 1933 – and hexode pentagrid, in 1935 there were lights in metal cases .. Further development of electron tubes went on ways to improve their functional characteristics, the path of a multifunctional use.