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US$700 is ambitious against the recent comp set: it sits above the US$609 75th percentile and well over the US$518 median, so it’s asking top-of-market money for an unconfirmed-condition example. That’s not automatically out of line if it’s unusually clean, serviced, and complete, but on comps alone it’s priced like a premium listing rather than a normal buy.
The appeal here is the Quad 66’s reputation as a serious, highly listenable preamp: neutral, polished, and very good at getting out of the way while still sounding musically refined. If this one is genuinely tidy and original, there’s real upside in build quality and long-term satisfaction; if not, the price leaves little room for surprises, so I’d want confidence on condition, switches, pots, and whether any accessories or documentation 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.
See all Quad listings on RADAR.
