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unold electrical components are one of the earliest types of electrical signal amplification devices. The cathode electron emission part, control grid, accelerating grid, and anode (plate) leads, enclosed in a glass container (usually a glass tube), are welded to the tube base. An electric field is used to inject electrons into the control grid in a vacuum to modulate the signal, and different parameter signal data after signal amplification or feedback oscillation are obtained at the anode. Early applications included electronic products such as televisions, radios, and amplifiers. Later, they were gradually replaced by amplifiers and integrated circuits made from semiconductor materials, but in some high-fidelity audio