Transistor audio amplifier circuit with DC coupling

The A1 (CA3100) integrated circuit is used as the input stage, while the power amplifier stage uses discrete transistors
. It is actually two cascaded amplification modules with a common feedback loop. The split amplification module is composed of R17, Rl0 and c8.
form its own local feedback. The input stage of the split part is a common base VT12, VT13 (oi2.013) circuit. This stage is used as a
voltage converter and works in class A. The next stage VTl, VT2c01,02) also works in class A, and Its main function is electronic J Chu amplification
.