The Far East quite a popular hi fi BJT transistor amplifier module for full power output transistors 4 2SC 5200 and 2S 1943 should be tested one at each used test voltage +-35v accordingly, the power will be lower... Electronics Projects, 400W Power Amplifier Module Circuit 2SA1943 2SC5200 "audio amplifier circuits, transistor amplifier, " Date 2019/08/02