三极管在电路中主要起到电流放大作用！一般测量其好坏就是测其极间电阻判断是否短路或开路．有没击穿！三极管型号太多了！我列一些比较长用的：C9013，C9012，C9014，S8050，S8550，C1815，A1015TIP41C，TIP42C，A1941，C5198，A1943，C5200，TIP122，TIP127，KSE13007，FJP13009，MJE13001
这段文字，语法上问题较多，有的专业术语也查不到，但我尽力翻了，供楼主参考。
Power amplifier's input stage is used shoot follower as buffer input. 功率放大器的输入级用发射跟随器（shoot follower）作为缓冲器输入。Second stage is used difference circuit as small signal voltage amplifier stage. 第二级采用差分电路作为小信号电压放大器级。Set electricity stage as constant current source loading. 将电气级设定为恒定的电流源负载。There is higher voltage gain and indissoluble work, small nonlinear distortion. 存在较高的电压增益和不能分解的功，以及小的非线性失真。 Third stage's main voltage amplifier stage is used sharing shoot stage circuit. 第三级的主电压放大器级采用共享的射发射级电路。Set electricity stage loading also is constant current source. It can make signal voltage amplifier to large enough. 同样将电气级负载设定为恒定的电流源。它可使信号电压放大器足够大。Between second and third stage also is used shoot follower to isolate. 在第二和第三级之间，也采用发射跟随器来隔离。Fourth stage is output push stage. 第四级是输出推挽级。Shoot follower is consisting of complementary middle-power double tubes, which are both installed on main radiator with bias control tube together. 发射跟随器由补充的中功率双管构成，它们都与偏置控制管一起安装在主辐射器上。Such has good temperature compensation and make output stage work steadily. 这样有良好的温度补偿作用，而且使输出级稳定工作。Fifth is power output stage, is consisting of 150W Toshiba mutual-complementing double tubes (C5200/A1943), when working in Ⅰstate, there are higher efficiency and strong output power. 第五级是功率输出级，它由150W的东芝互补双管（C5200/A1943）构成，当在电流（I）状态下工作时，具有较高的效率和强的输出功率。
