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M99每声道均用由一只6922三极管组成的SRPP电路作电压放大,用一只6SN7(6N8P)做倒相推动,用两只6L6(6P3P)做推挽功率放大。前端电压放大级与T99前级基本相同,本刊已作过分析,故本文从例相电路说起。 早期的推挽放大器,无论是电子管的还是晶体管的,多用变压器做倒相和末级输出耦合,后来OTL互补对称推挽电路使晶体管放大器不仅不使用输出变压器,而且也省去了输入变压器。此后出现的OCL全互补对称推挽电路,干脆连输出电容也去掉了,从而消除了输出电容对扩大器频率响应的影响,减少了频率失真。在OCL全互补对称推挽电路中,导电极性相反的PNP型晶体管和NPN型晶体管,分别接成射极输出器的形式,从而在工作上互相补偿,连接上互相对称,各自完成正
Each channel of the M99 is voltage-amplified with an SRPP circuit consisting of a 6922 transistor, driven in phase with a 6SN7 (6N8P), and push-pull power amplified with two 6L6 (6P3P). The front-end voltage amplifier stage is basically the same as the previous stage T99, this article has been analyzed, so this article talking about the phase circuit. Early push-pull amplifier, whether it is tube or transistor, multi-purpose transformer to do the phase inversion and the final output coupling, later OTL complementary symmetrical push-pull circuit so that the transistor amplifier not only does not use the output transformer, but also eliminates the need for input transformers. Since then, OCL full complementary symmetrical push-pull circuit appears, even the output capacitor is removed, thus eliminating the output capacitor on the amplifier frequency response, reducing the frequency distortion. In OCL full complementary symmetrical push-pull circuit, PNP transistor and NPN transistor of opposite conductivity have the form of emitter follower, so as to compensate for each other in work and symmetrically connected to each other to complete positive