Plinius Audio SA-250 User Manual
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Class A has always been regarded as the perfect operating mode for audio amplifiers. Many leading
amplifier designers and manufacturers world wide recognise that a well designed Class A circuit has
inherently lower distortion than any other design.
Class A circuit topology is one in which the total current the amplifier is capable of delivering, is kept
flowing in the circuit regardless of demand. In a conventional or Class AB amplifier circuit this current
flow varies when demand varies. Furthermore, as current varies, the voltage on the rails (as seen by the
output stage) varies too. In a Class A circuit, current draw should be constant therefore there is an
absence of the power supply modulation common in Class AB design amplifiers. Pinpoint images, tonal
clarification, intertransient silence, more readily defined dynamic shadings, inner detail and authority are
all inherent advantages of good Class A design.