The Quad II-forty power amplifier is much more than a tribute to one of the most famous designs in audio - but refined and powerful in the modern sense of the terms. Although the circuit topology has changed a little from the original, significantly better components and a brand new transformer design have been engineered. While still being delicately balanced a fast, crisp and detailed sound is achieved, whilst producing an output current suitable for modern loudspeakers, including our very own ESL. KT-88 output valves work in push-pull configuration, while a choice of 4 Ohm or 8 Ohm taps allow for a wide choice of loudspeaker configurations.

A Truly Iconic Amplifier


Designed by Quad founder Peter Walker, the truly iconic Quad II helped to define the modern concept of high-fidelity sound in the 1950s. Quad has kept the legend alive with the current Quad II classic, a faithful reproduction of the original valve monoblock with build quality and aesthetics lovingly updated for the modern era. The new version takes this a step further, with the development of additional, pre, power and integrated models. (Pictured: Original Quad II Amplifier as designed by Peter Walker).

The Quad II Series circuit design is the work of Tim de Paravicini, a man widely acknowledged to be the UK's foremost valve amp designer. His design is faithful to Peter Walker's Philosophy of cathode loading onto the same output stage and fundamental simplicity of design, ensuring the new amp delivers the same wealth of detail and exquisite tone as its famous predecessor.

Quad QII-Forty

Finish: Lancaster Grey
  • Power Output 40W RMS
    THD @ 700Hz 0.3% @ 40W
    0.03% at 1W
    Residual Hum and Noise Better than -80dB
    Frequency Response 10Hz - 30kHz (+0dB, -0.5dB)
    Damping Factor 20 @ 700Hz (referred to 8 Ohms)
    Power Consumption 180VA maximum
    Loudspeaker Taps 4 and 8 Ohms
    Valves 2 x 6SH7 Input
    2 x KT88 Output
    1 x 5U4G Rectifier
    Input Sensitivity 1V RMS
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