The name of Peter Walker and the company he founded - QUAD have been ingrained in the history of Audio Reproduction around the world. Not only famous for the classic Electrostatic Loudspeakers he designed in 1957, were followed in 1958 with Stereo Reproduction. Peter Walker’s name has always been associated with the electronics he developed - in particular Amplifiers. Peter Walker’s valve and transistor designed amplifiers live on today in QUAD’s ranges of valve and transistor amplifiers. Quad products have always been some of the finest audio products in the world.
In 1936, Peter Walker started producing public address systems, few could predict that many of his products would have the longevity and the esteem with which they would be held. In the 1950’s, Peter Walker and Gilbert Briggs (founder of Wharfedale), embarked on a series of famous concerts, demonstrating that real high-fidelity music reproduction should be virtually indistinguishable from a live performance. They toured as far as the United States and demonstrated in venues as diverse as Carnegie Hall and the Royal Festival Hall. Audiences were truly amazed in the similarity that the Quad amplifiers were able to reproduce relative to the live performance.
Dooleys HiFi are pleased to be continuing our association with QUAD with the Classic Line of Electrostatic Loudspeakers, Valve Amplification, Artera and Vena electronics and QUAD’s ranges of Dynamic loudspeakers, the S- and Z - Series.
Quad QII-Forty Power Amplifier
£1999.99 Each
£3999.00 for a Stereo pair
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 a push-pull configuration, while a choice of 4 Ohm or 8 Ohm taps allows for a wide choice of loudspeaker configurations.
Quad QII-Forty Specification
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
Quad QII-Eighty Power Amplifier
£ Each
Designed by the late Tim DeParavicini, the Quad II-Eighty takes inspiration from the original Quad II amplifier. It is an 80-Watt mono power amplifier following in the tradition and philosophies of Peter Walker. The output section consists of 4 KT88 valves running as two pairs in push-pull with the hallmark Quad topology of partial cathode loading in the output transformer.
Quad QII-Eighty Specification
Input Sensitivity (nominal) 1V RMS for full output
Power Output 80W RMS
Output Impedance 4 Ohms or 8 Ohms, selectable
THD @ 80 Watts 2 x EF86
0.5% - 30Hz - 15kHz
1.0% - 20 - 20kHz
Residual Hum and Noise Better than -94dB
Frequency Response 10Hz - 30kHz (+0dB, -0.5dB)
3Hz - 50kHz (-3dB)
Damping Factor 16 @ 1kHz (referred to 8 Ohms)
Power Consumption 240VA maximum
Valves 2 x 6SL7
1 x 6SN7
4 x KT88
Quad QC-Twenty Four Pre-Amp
£1099.99
With the QC Twenty Four pre amp, our designer scoured the globe for the very finest components, with possibly the best example of this being the new ‘old stock’ 6111WA double triode.
With transformers designed by one of the world’s leading authorities and relay input switching the musical signal is preserved in its purest form – pursuant to the philosophy of the theoretical perfect amplifier which Peter Walker himself stated is, ‘a straight wire with gain’. The QC Twenty Four has 2 main outputs, 2 Tape Play and Record connections and inputs for CD, Tuner, Aux 1, Aux 2 and an optional Phono port.
QC-Twenty Four Pe-Amp Specification
Valve Complement 1x 6111 twin triode
THD @ 1V RMS <0.2%
Frequency Response 5Hz - 50kHz (+0dB/-0.5dB)
Hum and Noise Better than -80dB
Line Stage Gain 15dB
Recommended Minimum Load 50 k Ohms
Inputs 5 x Line level
2 x Buffered tape loops
Power Consumption 15VA maximum
Quad QC Twenty Four P - Phono Stage
£1099.99
With the analogue purist in mind the Twenty Four P has a moving magnet / moving coil toggle switch and direct / variable level control over volumes for use with all kinds of amplification. Unlike the power amplifiers, the Quad pre amplifiers utilise a completely new design. Together with transformers designed by one of the world’s leading authorities and relay input switching the musical signal is preserved in its purest form – pursuant to the philosophy of the theoretical perfect amplifier which a Peter Walker himself stated, is ‘a straight wire with gain’.
Quad QC Twenty Four P - Specification
Valve Complement 4 x 6111
Total Harmonic Distortion <0.08% (A-weighted)
Frequency Response (RIAA/IEC equalisation) 20Hz - 20kHz (+/-0.5dB)
Hum and Noise (mm position,input shorted) Better than 60dB
Input Impedance
Moving Magnet 47k½
Moving Coil 10½
Stage Gain
High Sensitivity 1.3mV (MM)/130µV (MC)
Medium Sensitivity 2.6mV (MM) / 260µV (MC)
Low Sensitivity 5.2mV (MM) / 520µV (MC)
Nominal Output Level(ref 5.2mV, MM, Low) 1.0V
Inputs Selectable MM/MC cartridge
Outputs 1 x Fixed line level, 1 x Variable line level
Power Consumption 15VA maximum
Dimensions (H x W x D) 90 x 220 x 300mm
Quad II-Integrated
£3999.99
The Quad QII-Integrated evolves the QII into a fully integrated stereo amplifier for the very first time in a user-friendly, yetThe preamp section delivers three line inputs, plus full tape monitoring. Every detail is engineered to the highest standard; even the built-in phono stage is of higher quality than many costly standalone devices, ensuring that every musical source, from vinyl to digital, is delivered with exceptional panache.It stays true to the original Quad II mono-blocks in its push-pull KT66 output configuration and single-tap output transformers, yet it’s actually twice as powerful – rated at 25W per channel.
Quad QII-Integrated Specification
Valves 4 _ KT66
4 _ 12AX7
2 _ 6922EH
Input Sensitivity 275mV RMS (Line Level & Tape Monitor)
2mV RMS(MM)
200_V RMS(MC)
Output Power 25W per Channel into 8 Ohms
THD 0.06% @ 15W(700Hz)
Hum and Noise Better than -98dBA (ref 25W into 8½)
Frequency Response 20Hz - 20KHz (+0dB/-1dB)
Crosstalk >75dB
Voltage Gain 34dB
Power Consumption 195W (max)
Dimension (H _ W _ D) 200 _ 310 _ 380mm
Quad QII-Classic Mono Power Amplifier
£2199.00 a pair - Lancaster Grey
The Quad QII-Classic is a faithful reproduction of the original – the new Quad II Classic offers audiophiles the chance to recreate the spirit and atmosphere produced by one of the most famous amplifiers in audio history. Peter’s circuit, notably the design of the output transformer has become of legendary status – analysed by the finest minds in the industry.
The Quad II classic has been recreated accurately with output valves and input valves the equivalent of those used in the original. The output valves produce around 15W per channel operating in Class A, which allow a gloriously sweet and refined sound with appropriately matched contemporary loudspeakers.
Quad QII-Classic Specification
Input Sensitivity 775mV RMS
Power Output 15W RMS
Output Impedence 8 Ohms
THD @ 700Hz 0.8% @ 12W
Residual Hum and Noise Better than -90dB
Frequency Response 10H - 20kHz (± 0.2dB)
Damping Factor 11.75 @ 700Hz (referred to 8 Ohms)
Valves 2 x EF86
2 x KT66
1 x GZ34
Dimensions (W x H x D) 335 x 121 x 171mm
Weight 8.3kg
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