NPN EPITAXIAL TYPE (LOW NOISE AUDIO AMPLIFIER APPLICATIONS RECOMMENDED FOR CASCODE, CURRENT mirror CIRCUIT OF THE FIRST STAGE OF PRE, MAIN AMPLIFIERS) npn型外延型(低噪声音频放大器应用推荐用于级联,电流镜电路学前,主功放的第一阶段 From old datasheet system NPN EPITAXIAL TYPE (LOW NOISE AUDIO AMPLIFIER APPLICATIONS RECOMMENDED FOR CASCODE/ CURRENT mirror CIRCUIT OF THE FIRST STAGE OF PRE/ MAIN AMPLIFIERS)