Hushan 100J-01 power amplifier

The power amplifier produced by Sichuan Mianyang Hushan Audio Technology Co., Ltd. is a new type of household high-fidelity power amplifier.
Its circuit principle is shown in Figure 2-16.
    The power amplifier circuit consists of dual differential input stages, symmetrical complementary push-pull It consists of voltage amplification stage, composite tube complementary push-pull power output
stage, bias circuit and output protection circuit.
    VTi~VTio form a complementary symmetrical dual differential input stage, in which VTs and VT6 are their constant current sources , and VT7~ 1rrlo are their constant current sources
. mirror constant current source load. Due to the use of dual constant current sources , the stability of the circuit is very high, and
the common mode rejection ratio of the circuit is also improved.
    VTri.VT12 forms a complementary push-pull voltage amplification stage, and VTl3 - VT15 are complementary symmetric push-pull power amplification stages. This stage
uses Japanese "Sanken" famous tubes 2SA1295 f/SC32640
    VTt7 to form the output bias circuit and
    VT18.VT19 to form the output protection circuit. When the output tube is overloaded, the input signal can be shunted or even short-circuited
to ensure power Operational safety of the output tube.