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Condition is unknown, so this sits a touch under the market without being a steal: at £374 it’s just below the £395 median and only a little above the £369 25th percentile, which makes it a sensible buy if it presents cleanly and is working properly. It is not bargain-bin cheap, but it is priced in the right zone for a desirable older Quad power amp.
The appeal here is straightforward: the 606 is a respected, no-nonsense solid-state power amp with a reputation for smooth, controlled drive and real musical ease, especially in a system that values refinement over flash. If the unit is original, quiet, and has had sensible care, this is the kind of listing that can make a very satisfying long-term buy; just confirm basic health, recent servicing, and that any needed pairing/compatibility details are sorted before committing.
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.
