Quad QC Twenty Four

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Special Price $1,795.00 (Normally Regular Price $2,295.00 )

Valve Line Level Preamplifier, Perfect Match For Quad II-40 or II-80 Valve Power Amps

Designed By Tim de Paravicini, Uses A Modern Classic Military Specification 6111 Valve

Optional Plug-In Phono Stage Available

One Only - Display Model

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A relatively new design, the QC-24 pre amplifier is both neutral and detailed. Using a military specification 6111 valve, which is so reliable, it’s hard-wired to the circuit board.


Everything on this QC-24 preamplifier has been designed, by valve supremo Tim de Paravicini - probably the finest valve amplifier designer in the world today, to maintain optimum signal purity. From the relay switching to the gold-plated terminals, each component has been selected specifically for its audio performance. The chassis is painted to match all Quad Valve Amplifiers, making it a perfect partner in all systems.

For the QC Twenty Four pre amp, QUAD scoured the globe for the very finest components, with possibly the best example of this being the new 'old stock' 6111WA double triode valve. 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.

For many audiophiles, just as vinyl will never be truly replaced by digital music, the vacuum tube communicates on an emotional level that can never really be surpassed by a transistor based design. For the analogue purist, the combination of a good valve amplifier and a good turntable is the closest possible approach to the original recording. Whilst the standard QC-24 is line level only, there is an option of a solid-state phono stage which can be added when new, or at a later stage. This module has an internal switch to change between moving coil and moving magnet cartridges.

The Quad QC-24 Preamplifer has an understated elegant simplicity, with high quality components used wherever these appear in the signal path. Bifurcated contact relays (crossing each other at right angles to make a better contact) are used on each input to maintain the best possible signal conduction. Gold plated connectors and a carefully screened enclosure are further examples of the attention to detail throughout the construction. The total line gain is 15dB, with a high quality potentiometer controlling the output levels. Reminiscent of the original QC-22 control module, there is a simple balance control allowing for left to right variation of up to 12dB. Amplification is provided courtesy of a twin triode 6111, new old-stock valve - originally designed for use in the guidance systems of missiles and manufactured to exceptionally high tolerances. The remarkably long expected life-span of this valve means it can comfortably be build it into the PCB without the compromises usually experienced when using valve seats.

Quad sound systems have always provided high levels of listening pleasure to their owners. Quad’s philosophy has always been one of reproducing the 'live' experience in the comfort of your own home. Whilst many modern amplifiers are stunningly accurate and offer breathtaking resolution and distortion figures in tiny fractions of a percent, many also lose sight of the overall aim - which for Quad, is to bring pleasure to the listener by recreating the entire range of sensory experiences felt at a live performance.

Main Features & Specifications

  • Valve Complement: 1x 6111 twin triode
  • Inputs: 5 × Line level (One Line Input can accept the Optional MM/MC Switchable QUAD Phono Stage), 2 × Buffered Tape Inputs
  • Outputs: 2 x Preamp Outputs, 2 x Record Outputs
  • Total Harmonic Distortion: 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: 50K Ohms
  • Power Consumption 15VA maximum
  • Dimensions (W x H x D): 220 x 90 x 300mm
  • Nett Weight: 3.5kg
  • Manufacturer's Warranty: 2 Years

Note: Features & Specifications Subject To Change Without Notice. E&OE.  

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