RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
This is a buyer’s market for this kind of vintage amp right now, and at £350 it’s a touch above the £300 median and just over the £325 75th percentile, so it reads as a mild premium rather than a bargain. It’s not outrageous, but it isn’t the sort of price that invites much negotiation room unless the condition or extras are especially good.
The Quad 306 is well-liked for clean, composed solid-state power with plenty of drive for real-world speakers, and it has a solid reputation for reliability and sensible, no-nonsense engineering. If it’s genuinely tidy, fully working, and ideally comes with a good service history or original box, it’s still a worthwhile buy. At this level, though, I’d want reassurance on channel balance, relay/noise issues, and whether it has been serviced.
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.
