Triode

Triode is a type of vacuum tube which is used in radio and audio amplifiers and oscillator circuits.  Triode is just like a diode , additionally it has a wire mesh control grid between the plate ( anode ) and cathode that is used to control the flow of current. A filament heats the cathode enabling it to release electrons. When a small voltage is applied to the grid, the flow of current between the cathode and plate is changed accordingly.

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