The beauty of this Sansui au555a was a fun project, I'll show you how to set the bias on this unit measuring in mA. the sound of a Sansui is noted on this amplifier, rated at 25w/ch but don't let this fool you, this gorgeous gem is a must if your lucky enough to get one or worth repairing...
* note...I believe the volume on my frequency generator was not at max when I was testing this amp and that would be the reason I was short on the watts, I only notice this after the amplifier was back to the customer so I wasn't able to retake this section but I know, it was pushing maybe more than it's rated at...I just can't prove it...SORRY!