What is diode valve? 1) Diode valve is simplest thermionic tube, which was invented by Sir Fleming in year 1904. 2) The working of diode valve is based upon the phenomenon of thermionic emission and Edition effect. Edition effect states that a metal plate surrounding the cathode if kept at positive potential w.r.t. cathode, the electrons emitted from cathode will be reaching the plate and there will be an electric current. If the plate is kept at negative potential w.r.t. cathode, the electrons emitted from cathode will not be reaching plate and there will be no electric current . 3) Diode valve consists of a highly evacuated glass bulb having two elements. a) Cathode K, which may be directly or indirectly, heated tube. b) Plate P- It is a hollow metallic cylinder of nickel-molybdenum or iron. It surrounds the filament completely. The plate serves the collector of electrons. The glass bulb is mounted on an insulating base provided with base pins to which termina...
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