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sbp spa electrical components are among the earliest devices for amplifying electrical signals. The cathode electron-emitting section, control grid, accelerating grid, and anode (plate) leads, enclosed in a glass envelope (typically 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. Initially applied in electronic products such as televisions, radios, and loudspeakers, they were later gradually replaced by amplifiers and integrated circuits made from semiconductor materials, but in some high-fidelity