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为了改善音质,有些发烧友常常把优秀的电路复杂化。殊不知,复杂并不等于Hi-Fi(高保真)。有鉴于此,西方“玩家”发表了“简洁至上”的至理名言。本文介绍的放大器便是一款十分简洁的功放(见附图),其实际放音效果,却能令阁下“闻韶忘味”。 该机的电压放大部分(VE1)采用低互导、高内阻的优质国“胆”6N9P。该管为双三极电子管,同类“洋品”有6SL7、6H9C(前苏联)等。6N9P“一分为二”,其一半VEIa作前置电压放大;另一半VE1b担任倒相级。级间采用直接耦合方式,这种方式的优点是不产生信号相移,也没有低频抑制衰减,对扩展低端频响有利。倒相级采用P-K(屏
In order to improve the sound quality, some enthusiasts often complicate the excellent circuit. As everyone knows, complex does not mean Hi-Fi (high fidelity). In view of this, the western “players” published the “simple and supreme” wisdom. This article describes the amplifier is a very simple amplifier (see photo), the actual playback, but can make you “smell Shao forget.” The voltage amplification part of the machine (VE1) uses low transconductance, high internal resistance of high quality “gall” 6N9P. The tube for the bipolar transistor, similar “foreign products” 6SL7,6H9C (the former Soviet Union) and so on. 6N9P “one in two” half of VEIa for pre-voltage amplification; the other half VE1b served as the inverter phase. Direct coupling between stages, this approach has the advantage of not generating signal phase shift, there is no low-frequency suppression of attenuation, the expansion of low-frequency response favorable. Inverting stage using P-K (screen