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Quad II

Quad II
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Quad 303

The 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
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Quad 405

The Quad 405 power amplifier is intended for use with loudspeakers of less than normal efficiency. Great care has been taken to ensure that the high power output of the 405 does not increase the risk of damage to the loudspeaker. Although direct coupled, the d.c. offset voltage is confined to negligible values even' under gross overload. A fixed high pass filter is incorporated to prevent spurious subsonic signals from reaching the loudspeaker. The Quad 405 uses a current dumping output circuit, a Quad invention which eliminates many of the problems associated with transistor amplifiers. The basis of current dumping is 'feed forward error correction' first proposed by Harold Black in 1928, in which a derived error signal is added to the output signal of an amplifier in exactly the right amount to cancel the distortion produced by the amplifier. While it is relatively easy to add error current to signal current without Interaction, as in Black's invention, it is very much more difficult to do so in voltage terms. Loudspeakers require a stiff source and so 'feed forward' has found no successful application in audio amplifiers. Weight 9kg.

Quad 405
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Quad 22

Quad 22
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Quad 33

The Quad 33 selects and controls the radio tuners, gramophone pickup and tape recorder connected to it and feeds the loudspeakers via the power amplifier, providing for stereo, or mono on either or both channels, from all inputs, plus monitoring and track selection facilities for tape. Quad units may be used either free-standing or mounted in a cabinet, with plenty of scope for individual preference in layout design. The standard Quad system of mounting is used, requiring only a rectangular cut-out for which a template is provided. The controls are comprehensive but simple and are logically grouped to facilitate selection and control of the programme. The filter is essential with modern good quality speakers and helpful at any time. It removes surface noise, tracing distortion and similar shortcomings in the upper frequency range of the recording or broadcast, and the two control filter system achieves this to a very fine degree without intruding unnecessarily into the harmonic range so essential for realistic reproduction. Another fixed, built-in, filter cuts out (without affecting the normal low frequency response of the equipment) unwanted signals at frequencies below 20Hz, due to mechanical causes in motors and turntable mechanisms. Entirely separate from the filters are the bass and treble controls which provide independent adjustment of tonal balance when required. This operation is symmetrical and smooth without any unpleasant 'steps' in the response. Weight 3kg.

Quad 33
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Quad Electrostatic

First introduced some twenty years ago, the world's first commercial full range electrostatic loudspeaker remains the standard by which all others are judged. Using closely coupled moving elements some two hundred times lighter than the diaphragms of moving coil loudspeakers and being entirely free of cabinet resonances and colouration, this loudspeaker overcomes the usual major problems of loudspeaker design and provides remarkably natural reproduction of sound. This explains why the Quad electrostatic loudspeaker is used by broadcasting and recording organizations all over the world, in applications where quality is of prime importance, and as a standard of reference by the majority of loudspeaker manufacturers. There is no known method of expressing the performance of a loudspeaker in meaningful terms. Impressive specifications and curves are no substitute for a listening test and a comparative demonstration using music and speech material is strongly recommended. The speaker is enclosed within expanded metal grilles with polished wood end frames and feet and is suitable for use under normal domestic living conditions throughout the world. It is designed for use in rooms up to 140 cubic metres. It is essential for both performance and reliability that this loudspeaker be used only with a Quad amplifier or one especially designed for this type of loudspeaker.

Quad Electrostatic
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Quad FM-3

VHF/FM broadcasting is intended to provide reception, within the service area of the transmitter (normally 50 to 100 miles) free of interference and capable of reproduction at very high quality. The Quad FM3 tuner will completely fulfil this purpose with any transmission which arrives at the aerial in a condition capable of full quality recovery. Outside the service area of the transmitter it is the nature of VHF/FM for signal strength to fall rapidly and there will be a tendency to fading but the higher sensitivity of the FM3 tuner enables it to receive such signals with the reservation that no tuner can Improve the signal/noise ratio of the signal as it arrives at the aerial. Operating the FM3 is simple; the only control on the front of the FM3 tuner being the tuning knob (which is also used for setting the station markers) and no others are required. There is a pre-set noise suppression control at the rear of the tuner which when correctly adjusted enables the user to tune from one station to another through complete silence. All switching, mono hold, on/off, are provided by the associated Quad 33 control unit. The position on the scale of any five stations may be indicated by pre-set markers. These are positioned by pressing the tuning knob to engage its pointer with any marker in turn, tuning to the stations to be marked and releasing the knob. The markers then stay in position for future reference. The tuning indicator is the original Quad twin lamp system which provides for simple, positive and highly accurate tuning. To achieve (and maintain) the desired bandwidth and shape the tuner employs ceramic filtering. Weight 2.7kg.

Quad FM-3
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