Audio Amplifier (With RPO Code U57)

Audio Amplifier C1 (With RPO Code U57):

Audio Amplifier C2 (With RPO Code U57) Part 1:

Audio Amplifier C2 (With RPO Code U57) Part 2:

Audio Amplifier C2 (With RPO Code U57) Part 3:

Audio Amplifier C3 (With RPO Code U57):