有急用，在线等。拿网上在线翻译弄的请靠边站，用在线翻译我也会。 Power amplifier's input stage is used shoot follower as buffer input. Second stage is used difference circuit as small signal voltage amplifier stage. Set electricity stage as constant current source loading. There is higher voltage gain and indissoluble work, small nonlinear distortion. Third stage's main voltage amplifier stage is used sharing shoot stage circuit. Set electricity stage loading also is constant current source. It can make signal voltage amplifier to large enough. Between second and third stage also is used shoot follower to isolate. Fourth stage is output push stage. Shoot follower is consisting of complementary middle-power double tubes, which are both installed on main radiator with bias control tube together. Such has good temperature compensation and make output stage work steadily. 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.