前级放大器被称为音响系统的音质调控中心,通过前级放大器对弱小音频信号的捕捉放大,音乐的细节更加丰富,层次更加清晣,声音显得活泼有力。特别是电子管前级放大器,屏压高,电流小,电子在真空管内部工作,又总是工作在线性区域内,在一般情况下不会饱和。因此,失真低,频率特性好,声低通 Preamplifier is called the audio system quality control center, through the preamplifier to capture the small audio signal amplification, more details of the music, the level is more clear, the sound is lively and powerful. In particular, preamplifier tube, the screen pressure is high, the current is small, the electron inside the vacuum tube work, and always work in a linear region, under normal circumstances will not be saturated. Therefore, the low distortion, good frequency characteristics, low-pass sound