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Compared with the obvious alternative at this price point—waiting for a cheaper clean 405 or stepping up to a newer mainstream power amp—£333 lands a bit above the £288 median but still below the £347 75th percentile, so it reads as slightly firm but still fair rather than overpriced. It is not a bargain at the £222 25th percentile, but it is close enough to the center of the market that a clean example can justify itself.
The appeal here is the 405’s reputation for honest, musical power and a well-proven modular design that still has a following for good reason. If this one is tidy and electrically healthy, the upside is owning a classic that can sound very composed with the right speakers; at this level, I’d mainly want to know whether it has been serviced, whether the channels are balanced, and whether any original 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.
