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Quad 303The outstanding performance of the Quad 303 is largely due to the unique output 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 303. Such a level is, of course, completely inaudible no matter how refined the test. 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.
Quad 303 Power Amplifier Power Output: The amplifier is intended for use with loudspeakers of 4-16 ohms nominal Impedance. Power output and distortion for various frequencies. Continuous sine wave into 8 ohms resistive load. 100Hz any level up to 45 watts <0.03% Dtot 1 kHz any level up to 45 watts <0.03% Dtot 10kHz any level up to 45 watts <0.1% Dtot Output Internal Impedance: 0.3 ohms in series with 2000µF and 6µH Frequency Response: Ref. 1kHz. -1dB at 30Hz and 35kHz into 8 ohms Signal Input Level: 0.5V rms ±0.5dB for 45 watts into 8 ohms. Amplifier loads the input by 22k ohms in parallel with 60pF Signal Input Overload: Instantaneous recovery up to +20dB overload Crosstalk (input loaded by 1k ohms): 30Hz-10kHz >60dB Hum and Noise (input loaded by 1k ohms): 'A' weighted - 100dB ref full power Unweighted (15.7kHz measurement bandwidth) - 95dB ref full power Protection: This amplifier is suitable for use under the most arduous music conditions with speakers of impedances between 4 and 25 ohms, and for high level sine wave duty with loads of 8 ohms or greater Stability: Unconditionally stable with any load Power Input: 100-125 or 200-250V, 50-60Hz, 40-200 watts depending on signal level Width: 120mm Height: 159mm Depth: 423mm (plus 38mm for connectors) Weight 8.2kg |
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