This is a audio power amplifier Blazer circuit provides up to 1000Watt . This routes bass and treble alive. Importantly Power , has been fairly high voltage 70Vdc GND -70V 10A current low level.
The transistors are 2SC3858 (NPN) and 2SA1494 (PNP), high bandwidth, safe operating , high linearity and high gain. Driver transistors are 2SC5200 (NPN) and 2SA1943 (PNP). All devices are rated at 230V, with transistors having a 150W dissipation drivers are 50W.
This circuit describes an amplifier, power and tests procedures that are all inherently dangerous. Nothing described article even be unless experienced, what doing, and are willing full responsibility for what . There are aspects of analysis, fault-finding and/or modification.