303

I had set the bias in my own Quad 303 in 2006 or 2007 with the aid of a high-quality Tektronics AA501 distortion analyzer and oscilloscope. This technique clearly shows cross-over distortion spikes when present, so it is easy to arrive at the minimum bias setting required to eliminate cross-over distortion. By this means I usually arrive at somewhere around 10-12mV across the emitter resistors.