Sound color pure electronic tube amplifier circuit schematic introduction

Car Audio Crystal 3.2*2.5mm 3225 24M (24.000MHZ) 20PF 10PPM 20PPM 30PPM

Single chip microcomputer STM32L151CCU6

Supply 0603 blue LED

This paper introduces a super linearity with a music power of 120W*2 and an rms power of 30W*2. The circuit of this amplifier has been improved on the basis of Williamson's amplifier. The most notable feature is that the curtain antenna feedback is designed in the output stage of the power amplifier, so that the output performance of the amplifier is improved compared with the Williamson amplifier. The status is Class A and Class B. If 6P3P is used as the push-pull tube, the maximum effective output power of the amplifier can reach 30W per channel. The optimum impedance of the screen to the screen load is about 6 kiloohms. The turns ratio of the coil of the primary curtain gate of the output transformer is due to the operation of the super linear amplifier in Class A and B. Therefore, the average current and the average screen current at the maximum output are larger than those without the signal, so the gate bias will also increase. It is around -40V. The 6N2 of this circuit is the input stage and the inverting stage. 6N1 is the driving level, and 6P3P is the power amplifier stage. The circuit principle is shown in the figure.