By revisiting the QUAD 33 and 303 components, QUAD demonstrates its authenticity, pedigree and excellence as a juggernaut of the British hi-fi world - past and present.

In listing the names involved in the development of this stunning iteration of an icon, youll find a calculation of close to 200 years of engineering experience and 100 years of QUAD-exclusive design and service.

A dream team of Rob Flain & Paul McConville (the worlds most experienced QUAD service engineers), Jan Ertner (30 years of experience in QUAD design), Peter Comeau (the acoustic director behind some of QUADs most successful loudspeakers) and David McNeill (the industrial designer responsible for two decades of QUAD innovations) were all a part of this labour of love, making no compromise in the demand for a product that could bear the name of 33 and 303.

The external design is specifically intended to continue the QUAD tradition of practical simplicity. Yet, it would be foolish to ignore the implementation of modern-day capabilities, such as an informative backlit display, delicate LED illumination and remote control functionality. And just like the original, the overall appearance is unmistakably QUAD, albeit now with a premium machined and anodised front panel and all-metal chassis.

Function

The new QUAD 33 is supported by digital microprocessor control but is otherwise faithful to a classic analogue design.

The 33 feeds the loudspeakers via the power amplifier using dedicated stereo pre-outputs, with an RCA line-level and balanced XLR pre-out option. For additional versatility and functionality, theres also an AUX output.

Now equipped with fully balanced XLR inputs and outputs, the 33 is set apart from other preamplifiers and even its forefather model.

The brand new phono stage is Moving Magnet and Moving Coil compatible with the ability to simply switch between the two options no mods or board upgrades necessary. With a gain of 46dB for the MM and 63.5dB for the MC, the input stage uses ultra-low noise audio op-amps. This ultra-low noise performance is combined with high slew rates and very low distortion specifications.The RIAA processing circuit has its own dual Bipolar/JFET Audio Operational Amplifier. The JFET portion of the input stage enables high slew rates to keep distortion low, even when large output swings are required.

Controls

The controls are comprehensive but simple. Again, this echoes the original design concept. Logically grouped to facilitate selection and control of the programme, a backlit LCD screen relays settings, adjustments and values. The same backlighting principle is applied to each of the push buttons, further enhancing the intuitive design with a visual indication of input selection and mode. Illumination settings for buttons and the LCD screen allow for brightness adjustment, contrast adjustment, and a simple on/off setting to suit the users preference.

The master volume control is a fully analogue, precision motorised ALPS potentiometer offering long-life and low-noise performance. The volume control is not only tactile and precise; its motorised operation will automatically rotate when adjustments are made via the remote control. A further row of three endless rotary encoders offer intuitive and immediate control over the QUAD-specific fine-tuning settings.

The original QUAD 33, as with many previous and subsequent QUAD preamplifier components, offered filters considered essential for modern good quality speakers (as was stated at that time). Such controls are no longer required; therefore, in applying modern-day logic and suitability to today's technology, the new QUAD 33 presents bass adjustment, tilt control and balance control to allow tuning to a fine degree without intruding unnecessarily into the harmonic range essential for realistic reproduction.

The bass control allows adjustment from-3dB to 3dB. Perfect for subtle adjustments in the low-end, as a solution to adding body to thinner source material. Or conversely, reducing bass tones in the event of room-affected 'boominess'. In comparison to the time of launch of the original QUAD 33, loudspeakers and source materials have evolved mainly for the better. This evolution saw the adoption of Tilt control in the QUAD 33ssuccessor, the QUAD 34 (1982).

Developed by QUAD founder, the legendary Peter Walker, the Tilt control is an audiophile-quality solution for adjusting tone. Its design stems from the belief that traditional tone and EQ controls are inadequate and clumsy when adjusting tonal balance.

The Tilt control differs in that it adjusts both ends of the frequency spectrum together, either attenuating the bass and lifting the treble, or lifting the bass and attenuating the treble in 1dB steps.

Essentially, it rotates or tilts the audible frequency range on a 700Hz axis, thereby adjusting the overall sound balance with 'warm' or 'cool' hints without altering volume or adding colour to the sound. This feature is unique to QUAD and offers a subtle, precise, and consistent way to adjust your system's performance and compensate for recordings or environments.

The Tilt control, Bass control, and Balance controls are all composed of low-noise op-amps, electronic switches, and MELF low-temperature coefficient metal film resistors, forming a negative feedback adjustment circuit.

It is bold but fair to claim that the low-noise, custom-specified toroidal transformer, numerous reservoir/smoothing capacitors, and an impressive number of regulators put the new QUAD 33 technically ahead of the original. The power supply incorporates five regulated supply rails, including multiple ultra-low-noise regulators with extensive measures employed to prevent contamination and cross-coupling. Following traditional QUAD practices, the core signal path is short and direct to preserve signal purity, and volume is adjusted purely in the analogue domain under microprocessor control. No one will champion the virtues of the original QUAD 33 more than QUAD, ourselves. However, side-by-side, technical innovations and improvements in signal processing cannot be denied.

Fit and Finish

The QUAD 33 has a crisp and clean aesthetic that evokes QUADs past yet sits in the modern-day with a futuristic accent. The housing is rigid and oozes quality. The end-finish is precise, just like the audio signal path. The anodised and custom-tooled fascia demonstrate the quality and level at which the new QUAD 33 will be recognised. No longer subject to cracks, fading or other issues associated with classic front panels, the QUAD 33 is ready for a lifetime of performance.

Ultimately, the new QUAD 33 considers every angle and aspect to underline the faithful evolution of the 33 concept. With each step in transitioning from concept to reality, the commitment to the closest approach to the original sound is evident.

Specifications