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2A3是上个世纪30年代专为音频用途而设计的直热式功率三极管,极具音乐味,本人制作的一台双声道2A3单管单端输出机,已经听了二、三年,凡是听过的朋友都赞不绝口,现总结出来介绍给各位同好。 2A3的参数是:屏极电压250V,最高300V,屏极电流600mA,灯丝电压2.5V,灯丝电流2.5mA,栅极电压-45V,输出功率4W,跨导5.25mA/V,输出阻抗2.5kΩ。2A3为四脚管,管脚排列见图1。
2A3 is a direct thermal power transistor designed for audio applications in the 1930s. It has a very musical taste. I have produced a two-channel 2A3 single-ended single-ended output machine and have listened for two or three years. Have heard the friends are full of praise, are summed up to introduce to you. 2A3 parameters are: the screen voltage 250V, the highest 300V, the screen current 600mA, filament voltage 2.5V, filament current 2.5mA, gate voltage -45V, output power 4W, transconductance 5.25mA / V, the output impedance of 2.5kΩ. 2A3 for the four-legged tube, pin arrangement shown in Figure 1.