电子管是一种在气密性封闭容器(一般为玻璃管)中产生电流传导,以获得信号放大或振荡的电子器件。早期应用于电视机、收音机扩音机等电子产品中,近来逐渐被晶体管和集成电路所取代,但目前在一些高保真音响器材中,仍然使用电子管作为音频功率放大器件。电子管在电路中用字母“V” An electron tube is an electronic device that produces current conduction in a hermetically sealed container, typically a glass tube, to amplify or oscillate the signal. Earlier used in televisions, radios and other electronic products, has recently been gradually replaced by transistors and integrated circuits, but in some high-fidelity audio equipment, still use the tube as the audio power amplifier devices. Tube in the circuit with the letter “V”