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Unknown condition is the only real qualifier here, but at US$900 this sits above the three-listing median of US$801 and clearly above the 75th percentile of US$850. That makes it a slightly ambitious ask rather than a bargain; a fully tested, clean example could justify it, while an unverified unit should sell closer to the market median.
The Quad 77 is a respected, distinctive power amplifier with a smooth, musical presentation and the current to make sensible partnering loudspeakers sound composed and natural. Its appeal is strongest for someone who values long-term listenability over showy detail, and good original examples are worth seeking out. Before paying the premium, confirm both channels work properly, the amplifier is quiet at idle, and the controls, terminals, and casework are intact. Included documentation or original packaging would help support the price.
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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