Posted on Tue, 13 Jun, 2017
Posted by Bob

Quad Valve amplification formed the foundations of Quad, one of the most historic and legendary Hi-Fi companies.

Formed by Peter Walker in 1936, Quad forged a legacy of high-performance audio equipment, which still continues to this day. Despite a move to Solid State technology in the 1970s, the appeal of Quad’s classic Valve equipment has endured.

Today on The Audio Affair Blog, we take a look at the current range of Quad Valve equipment and pay homage to this legendary manufacturer.

The Quad II – The Cornerstone of The Quad Valve Legacy

The product which (arguably) put Quad on the map, was their Legendary Quad II Monoblock Power Amplifier, Introduced in 1953. Its simple yet efficient design contributed to an excellent sounding amplifier, which is still revered and coveted today.

Thankfully, since 2005, the Quad II has been available, once again; the Quad II can be purchased as a faithful ‘re-issue’ of the Monoblock original, sold as a stereo pair of Monoblocks.

Quad II Classic Valve Amplifier


The Quad II is available in a number of configurations, some of which are reimagined and tastefully updated to suit the needs of the modern Audiophile.

For the Quad Valve purist, nothing else but the Quad II Classic will do; an authentic reissue of the original Quad II power amplifier, complete with KT66 output valves. The only significant departure being modern input and output connections instead of the original’s ‘Jones Plug’ connector.

If the 15watt output (30 as a stereo pair) of the Quad II Classic isn’t enough, then Quad have updated the design to offer two, KT88 driven, higher powered revisions.

The Quad II-Forty uses a pair of KT88 output valves, along with revisions to the power supply and driver stages, to deliver 40 watts per Monoblock. Likewise, the Quad II-Eighty ups this to 80 watts, with a quartet of KT88s.

Quad Valve Pre and Headphone Amplifiers

For those wishing to add a matching pre-amplifier to the Quad II power amplifiers, Quad offer the QC Twenty Four and QC Twenty Four P pre-amplifiers. Both of which are ‘clean sheet’ hybrid designs.

The QC Twenty Four pre-amplifier range utilises a military grade, ultra duty, ultra long-life 6111 valve. Input switching is carried out via relay switching for minimal signal degradation.

The QC Twenty Four offers two tape loops, four line inputs and an optional MM/MC phono pre-amp. For those purists who listen only to vinyl, the QC Twenty Four P is a stripped-out, minimal circuit version with a single phono input only.


Valves for headphone listening? Why ever not! The Quad PA-One headphone amplifier brings the Quad Valve magic to headphone listening with balanced and unbalanced line inputs, as well as USB and S/PDIF digital inputs.




Quad Valve Integrated Amplifiers

For those seeking the Quad Valve sound but in a more convenient package, Quad offer two, Integrated Valve amplifiers, the Quad II Classic Integrated and the VA One; both offering different design angles.

The Quad II Classic Integrated is essentially a pair of Quad II Classic, power amplifiers, coupled to a newly designed pre-amplifier, all wrapped up in one chassis. 3 line inputs, a selectable MM/MC phono pre-amp and a tape loop, make this a versatile and welcome addition to the Quad II line.


Quad II Classic Integrated

Looking for something more compact, and more affordable? Then the VA One, part of the Quad One range may slate your thirst for the Quad Valve sound in an ultra convenient package.

Integrating a stereo line-input, with modern, digital USB, S/PDIF and Bluetooth aptX connectivity, the VA One is a great way to add some analogue warmth to digital playback sources.