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二、减少噪音的主要方法 众所周知，音频讯号的传输特别是前级的弱小讯号是比较敏感的，容易被外来杂波干扰，影响背景的宁静度，机内的大电流讯号也容易干扰其他小讯号，严重时机子不能使用。噪声的来源除了散热不良、互扰，这些问题并没有规律可循，也不可能说灯丝一定用直流
Second, the main method to reduce noise As we all know, the transmission of audio signals, especially the front of the small signal is more sensitive to interference by external clutter, affecting the quietness of the background, the machine’s high-current signals also easily interfere with other small signals , Serious machine can not be used. In addition to the source of noise cooling poor, mutual interference, these problems do not follow the law, it is impossible to say that the filament must use DC