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低 u 功率三极管有极好的线性和较低的内阻,因而即使不加负反馈或负反馈量极小也容易获得极佳的音乐效果,该类三极管的代表为300B 和2A3,但价格昂贵。本文介绍两款利用常见的廉价三极管组成的高音质 Hi—Fi 功放,这两种功放采用电子稳压器调整管6AS7G 和小型发射管801-A,这两种三极管均有极低的内阻 Rp、高跨导 gm 和低 u 特性,这些正是优质胆功放输出级必备的条件。表1为 RCA 公司6AS7G 的标准参数和甲类推挽的应用参数,与6AS7G 特性相同的有6080、
Low u power transistor has excellent linearity and low internal resistance, so even if the negative feedback or negative feedback is also very easy to get excellent musical results, the transistor of the type represented by 300B and 2A3, but expensive . This article describes two high-quality Hi-Fi amplifiers using common inexpensive triodes that use an electronic regulator to adjust the tube 6AS7G and a small launch tube 801-A, both of which have very low internal resistance Rp , High transconductance gm and low u characteristics, these are the requirements of high-quality bile amplifier output stage. Table 1 RCA company 6AS7G standard parameters and a class push-pull application parameters, and 6AS7G the same characteristics of 6080,