Since TO − 204 sheath power transistors are used, cooler, pcb assembly etc. a challenging but high quality design. The amplifier has Output short-circuit protection. T22 and T23 take current measurements over 0.47-ohm resistor and take the T11 and... Electronics Projects, 2N6609 2N3773 HiFi Amplifier Circuit 550W "audio amplifier circuits, transistor amplifier, " Date 2020/02/06