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Last stage power amplifier circuit diagram

2015-01-06 13:44  
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Last stage power amplifier circuit diagram
V1, V2 form a single-ended input, single-end output differential amplifier, V3 constitutes a voltage amplifier. In order to ensure that there is sufficient gain and distortion improvment, V4 is used for temperature compensation. V5, V6 are current push tubes which mainly provide the necessary current for the power amplifier tube to reduce the input impedance of the power amplifier tube. The high-power tube uses the recently popular ZSC5200/2SA1943 pairing tube. R18 is the negative feedback resistor, the closed-loop gain of the machine is determined by R18, R17, C6 is the bootstrap capacitor.