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Quad
303 Amplifier
The
outstanding performance of the Quad 303 is largely due to the unique
circuit developed by Quad. The circuit employs symmetrical triples,
greatly reducing distortion and rendering the quiescent current
independent of output transistor temperature.
This
development enables the designers to reduce distortion to any
desired degree without sacrificing stability, and to maintain this
excellence under all dynamic conditions.
To
put this in perspective, the lowest theoretical distortion present
on the very best tape and disc will still be some hundred times
greater than that of the Quad 303.
The
use of triples, permits simple and effective control of the output
current and since the voltage is also controlled, the output
transistors are completely protected and must always operate within
their ratings with the obvious advantages of greatly improved
reliability under all conditions, without the use of elaborate and
expensive circuitry. The amplifier cannot be upset even when
overdriven by an asymmetrical signal or by shorting or disconnecting
the loudspeakers.
The
amplifier won a Council of Industrial Design Award in 1969.
Quad
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Quad
303 Power Amplifier Specification
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