The A3 is a dual mono design, meaning it is essentially
two individual pre/power amps built into one chassis. It could be
argued it's not really two mono amplifiers though, as at the minimum
the two channels still share the same volume pot and PCB (although it
does appear the left and right channels are on opposite sides of the
board). Nonetheless, the design philosophy is a good one. By preventing
each channel from sharing components, cross talk is minimized and the
sound stage should widen considerably. The dual mono design goes all
the way back to the power supplies, where you'll find two large
toroidal transformers in the front of the unit, one for each channel,
each with their own pair of filter capacitors (not sure of the brand or
size).