Electron Tubes

Thyratron Working Principle

Thyratron Working Principle: Thyratron is a hot cathode gas filled triode. Normally it is filled with a small amount of inert gas such as argon, hydrogen, neon or mercury vapour. The fast acting devices do not use mercury vapour as the mercury vapour has the disadvantage of characteristics varying with temperature and it takes time …

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Construction of Phanotron

Construction of Phanotron: The constriction of a gas-filled diode or phanotron is similar to a vacuum diode except that the size of its electrodes is larger so as to conduct heavy currents. As far as the symbolic representation of the gas-filled tubes is concerned, they are usually represented by a dot in the circle with …

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Explain Conduction in Gas

Conduction in Gas

Explain Conduction in Gas: Explain Conduction in Gas – The introduction of small amount of gas into the electron evacuated tubes entirely changes the operating characteristics—materially giving in general a greatly diminished voltage drop and correspondingly increased current. When the cathode of a vacuum tube is heated to its emitting temperature electrons are driven off …

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Classification of Gas Filled Tubes

Classification of Gas Filled Tubes: Vacuum tubes are no doubt, extensively used in communication control and industrial electronic circuits, but these can carry small plate currents (typically from 1 mA to 100 mA). For certain applications much large currents (from 1 A to 100 A) are required. Gas-filled electron tubes are generally used for such …

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