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 …
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 …
Cold Cathode Gas Filled Diode: The cutaway view of a Cold Cathode Gas Filled Diode is shown in Fig. 5.24. It essentially consists of two electrodes, namely cathode and anode, mounted fairly close together in a glass envelope. The anode is in the form of a thin wire, while cathode is of cylindrical metallic surface …
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 …
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 …
Construction and Working of Vacuum Pentode: In order to retain the advantages of screen grid and eliminate the harmful effects of attracting the electrons due to secondary emission by the screen grid, an additional third grid, known as suppressor grid, may be inserted between the screen grid and the plate. The tube having five electrodes, a …
Construction of Vacuum Tetrode, Working and Applications: Tetrode means four, hence tetrode is a four electrode tube consisting of a cathode, a control grid, a screen grid, and a plate. The constructional features of a typical Vacuum Tetrode are shown schematically in Fig. 5.20 along with the symbolic diagram. The only constructional difference between a …
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Vacuum Triode, Construction and Working: Construction of Vacuum Triode – The construction and the schematic symbol used for a vacuum triode are illustrated in Fig. 5.8. It, as the name suggests, consists of three electrodes namely, cathode (filament type or indirectly heated oxide coated type), anode and control grid (or simply grid). The cathode is …
What is Vacuum Diode, Construction, Working and Applications: Construction of Vacuum Diode – Vacuum diode is the simplest form of the electron tube for the production and control of free electrons. A typical vacuum diode is shown in Fig. 5.1. It consists of two electrodes—a cathode and an anode (or plate) mounted on a base …
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