QUAD 33

QUAD 33 Preamplifier – Iconic Design and Cutting-Edge Technology

The QUAD 33 is a modern reinterpretation of the famous preamplifier launched in 1967, a true tribute to the classic QUAD model that marked the history of hi-fi. This solid-state preamplifier maintains the unmistakable “Industrial” design that made QUAD a legendary brand, with a compact chassis that recalls the vintage style of the original model, enriched by a modern LCD display and orange LED backlit buttons.

Technical Features

Analog Circuitry and Digital Control: The QUAD 33 combines 100% analog electronics with a digital microprocessor for control of the functions, ensuring precise and uncompromising regulation.

Linear Power Supply with Custom Transformer: The power supply is equipped with a custom-made ultra-low-noise toroidal transformer, five regulation rails and ultra-low-noise capacitors for a clean and stable power supply.

Optimized Signal Paths: Signal paths are designed to be as short and direct as possible, preserving the integrity of the sound and minimizing any possible interference.

Advanced Adjustment Functions

Motorized ALPS Volume Control: Equipped with a precision ALPS potentiometer, it allows for smooth and precise volume adjustment, with the possibility of remote control.

Audiophile Adjustments for Bass, Tilt and Balance: Thanks to three rotary encoders, the QUAD 33 allows you to adjust bass, tilt and balance in a meticulous way, preserving the timbral and harmonic purity of the signal.

Integrated MM/MC Phono Stage: It features a high-performance phono preamplifier for MM and MC cartridges, with a high gain (63.5 dB for MC and 46 dB for MM), making it ideal for vinyl enthusiasts.

Outputs and Connectivity

Multiple Stereo Inputs and Outputs: The QUAD 33 offers a wide range of connections, including balanced XLR inputs, unbalanced RCA inputs and a switchable MM/MC phono input.

Versatile Outputs: Includes balanced XLR and unbalanced RCA outputs (Pre-Out and AUX), plus a Current-Feedback headphone output, compatible with impedances from 20 to 600 Ohms.

Trigger and LCD Display: Two 12V trigger ports allow integration with other devices, while the backlit LCD display makes it easy to manage settings.

Impeccable Audio Performance

Frequency Response and Minimal Distortion: With a linear frequency response from 20 Hz to 20 kHz and a total harmonic distortion (THD) of less than 0.0005% (Line RCA/XLR) and 0.002% (Phono MM/MC), the QUAD 33 guarantees faithful and detailed reproduction.

High Signal to Noise Ratio: Ensures minimal noise with a S/N Ratio of over 108 dB (Line RCA/XLR), 82 dB (Phono MM) and 74 dB (Phono MC).

General Specifications

Finish and Dimensions: Available in the classic QUAD Grey color, the QUAD 33 measures 258 x 83 x 165 mm, with a weight of 4 kg, and comes with a remote control for convenient use.

With the QUAD 33, technological innovation meets audiophile tradition to offer a superior sound experience, faithful to the original sound but projected into the future.

Solid state preamplifier, faithful and technologically updated reinterpretation of the unmistakable and legendary QUAD 33 marketed in 1967, ideal partner of the QUAD 303 power amplifier - compact chassis with an attractive Industrial Design aesthetic, adhering to the look of the original model, embellished by the implementation of a modern informative LCD display and buttons backlit with orange LED lights - 100% analog circuitry with control unit managed by a digital microprocessor - linear power supply stage with Custom Made toroidal transformer with very low noise, five regulation rails with ultra-low-noise regulators and abundant low-loss and low-noise filter capacitors - direct and very short signal paths to safeguard their integrity - analog volume attenuation control with motorized ALPS precision potentiometer - set of 3x rotary encoders for fine tuning the Bass, Tilt and Balance regulation circuits, meticulously designed to calibrate effective interventions with a specifically Audiophile perspective, maintaining unchanged the purity of the timbre and the harmonic signal - high-performance, low-noise MM/MC Phono stage with high gain level (MC 63.5 dB / MM 46 dB) - dedicated Current-Feedback headphone amplification circuit, capable of handling loads with impedances from 20 to 600 Ohm - stereo inputs: 1x L/R balanced XLR, 3x L/R unbalanced RCA, 1x L/R Phono RCA with MM/MC selector - stereo outputs: 1x L/R balanced XLR, 1x L/R unbalanced RCA (Pre-Out), 1x L/R unbalanced RCA (AUX), 1x 6.3 mm jack on the front panel - 2x 12 V trigger ports - frequency response 20 Hz - 20 kHz (+/-0.2 dB) - total harmonic distortion (THD, 1 kHz) less than 0.0005% (Line RCA/XLR) / 0.002% (Phono MM/MC) - signal/noise ratio (S/N Ratio, A-weighted) greater than 108 dB (Line RCA/XLR) / 82 dB (Phono MM) / 74 dB (Phono MC) - remote control included - Classic QUAD Grey finish - dimensions (W x H x D) 258 x 83 x 165 mm - weight 4 Kg