Avance Amplifier Repairs
An Avance Z501 needed the o\p transistors replacing; 2SC2581\2SA1106 and the drivers 2SC2344\2SA1101. The emitter resistors 0.22ohms had also gone. All the transistors on the driver boards were checked; 2SC2229\2SA949, 2SC2240\2SA970. There were several bad solder joints on the board, this was a class a\b amp from the early 80's, sounded fine after repair.