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micro technologies electrical components are among the earliest devices for amplifying electrical signals. The cathode electron emission section, control grid, accelerating grid, and anode (plate) leads, enclosed in a glass container (typically a glass tube), are welded to the tube base. An electric field is used to inject an electron-modulated signal into the control grid in a vacuum, and different parameter signal data resulting from signal amplification or feedback oscillation are obtained at the anode. Initially applied in electronic products such as televisions, radios, and loudspeakers, they were gradually replaced by amplifiers and integrated circuits made from semiconductor materials.