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At £213, this is a strong deal against the usual used market: it sits well below the £249 25th-percentile mark, with comparable examples clustering around a £303 median and £345 upper quartile.
The Quad 306 remains a very appealing compact power amp: its clean, controlled sound, current-dumping design and stable 50-watt-per-channel output suit a wide range of sensible speakers. It is also refreshingly unfussy and compact. With condition unspecified, confirm both channels are quiet and balanced, check for mains hum, and inspect the rear-panel protection/reset area and casing for impact damage. On an original, unserviced example, ageing power-supply capacitors are the one meaningful consideration, but at £213 there is enough value here to make this a worthwhile buying opportunity rather than a risky overpayment.
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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