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Recent comparable Quad 405 listings have a median asking price of £303 GBP, with the lower quartile at £240 GBP. At £150 GBP, this is well below that range and qualifies as a strong deal, assuming it is complete and working.
The 405 remains a well-regarded, compact 100-watt-per-channel power amplifier, admired for its smooth, relaxed presentation, robust construction and serviceable current-dumping design. It is especially appealing with conventional, reasonably easy-to-drive speakers. Given the age, confirm both channels work cleanly, with no hum, thumps, overheating or obvious modifications; tired capacitors and aged examples can need attention. Even allowing for a service, £150 GBP leaves useful headroom and makes this a worthwhile buy.
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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