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Mono preamplifier from the 50s. Designed to be powered from a Quad II main amplifier.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.Serial No. #8235.Serviced, tested, and fully functional.PSU works on 220V, EU power cord included.We ship worldwide, feel free to ask for a precise shipping quote.Price shown in EU includes 24% VAT unless you have entered your valid EU VAT number to your Reverb account. VAT can be deducted if you have a company with a valid EU VAT number or if you're based outside of EU. Non-EU buyer pays any import duties and tax as regulated by their local customs.
This is a classic, well-regarded integrated amp, and the asking price looks very attractive. At US$733, it sits below the US$952 median and even under the US$650–US$1,080 typical spread only by a small margin above the 25th percentile, so this is a solid-value buy rather than a stretch.
What makes it worthwhile is the Quad house sound: clean, composed, and musical rather than flashy, with enough refinement to anchor a serious system. If the unit is genuinely clean and fully functional, the value is in the overall experience more than specs on paper. At this price, I’d mainly want to confirm smooth controls, quiet operation, and that any original accessories or paperwork are included.
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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