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The Quad II is a classic mono valve power amplifier built for the kind of smooth, accurate reproduction that made early Quad systems so respected. Designed to partner with the Quad 22 control unit, it delivers stable performance that remains largely unaffected by load or signal conditions, helping it work well with a wide range of loudspeakers. Its thoughtful design, long-term reliability, and use of standard commercially tested valves made it a practical and refined choice for serious home listening. Serviced, tested, and fully functional. All valves have been checked and are in good working order. Fitted with vintage Mullard EF86 preamp valves, 2 x G.E.C. KT66 power valves, and a Mullard GZ32 rectifier valve. For a full Quad experience, these Quad II monobloc amplifiers can be paired with Quad 22 preamplifiers.Serial No. #7303. Excellent working and great visual condition.We ship worldwide, feel free to ask for a precise shipping quote. The listed ex VAT / VAT0% price applies if you have a company with a valid EU VAT number or if you're based outside of EU. Non-EU buyer pays the import duty and tax as regulated by their local customs. Private buyers in EU are a subject to VAT. We would have to add and charge 24% VAT tax part from private buyers in EU.
For a used Quad II 2 integrated amplifier, the US$1,344 asking price sits above the 75th percentile (US$1,278) of recent comparable listings, making it ambitious rather than a bargain. While the median market price is US$1,212, this listing exceeds it by US$132, so it is not a strong deal but reflects the "excellent" condition rating.
This unit remains a worthwhile buy because the classic Quad II design delivers warm, musical tube sound with robust dynamics that modern amplifiers often lack. Its 16-ohm output pairing and passive line stage offer timeless simplicity, and an original-owner condition in excellent shape suggests reliable operation. If it includes original cables and has been serviced, the timing and rarity justify the premium for enthusiasts seeking authentic vintage tone.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Quad, the venerable British hi-fi brand, traces its origins to 1936 in London, when engineer Peter J. Walker founded S.P. Fidelity Sound Systems, soon renamed the Acoustical Manufacturing Company. Relocating to Huntingdon in 1941 after wartime bombing, the firm shifted from public address gear to domestic audio amid post-war demand for superior sound reproduction. Walker's pioneering ethos—prioritizing "the closest approach to the original sound"—defined Quad from its early QA12 amplifiers, adopted by the BBC, to the iconic Quad I of 1953.
The brand excels in amplifiers and electrostatic loudspeakers, revolutionizing both categories. The Quad II power amplifier of 1953 introduced cathode coupling for vanishingly low distortion, while the 1956 ESL 57 delivered the world's first full-range electrostatic speaker, employing a massless film diaphragm for unparalleled transparency and transient speed. Quad advanced into solid-state with the 1967 303 and transistor designs featuring innovative "Triples" output stages, later expanding to integrated amps like the 99 series, moving-coil speakers, and modern electrostatic models such as the ESL 988 and 989.
Today, under the International Audio Group since 1997, Quad holds a prestigious position in the high-end market, revered by audiophiles for its unyielding pursuit of accuracy over trends. Its heritage components command vintage collector status, yet contemporary offerings maintain a niche boutique appeal among discerning buyers seeking refined, distortion-free reproduction that honors Walker's legacy.
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