Audio Amplifier

if the distortion of the transistor amplifier is obviously increased with the increase of the volume, it is necessary to check whether the operating point of a certain transistor of the push stage is offset (usually in the power amplifier without a protection circuit) or the capacitance distortion in the feedback circuit; and if the volume size is distorted, If the fault is in the front-stage amplifying circuit, check whether the working point of each amplifying tube is offset.