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Quad 909 Stereo Power Amplifier
Design: Solid-state with Quad current dumping topology
Power Output: 140W per channel into 8Ω
Power Output: 250W per channel into 4Ω
Frequency Response: 20Hz–20kHz (±0.3dB)
Total Harmonic Distortion: <0.01%
Signal-to-Noise Ratio: >108dB
Input Sensitivity: 775mV for rated output
Input Impedance: 20kΩ
Dimensions/Weight: 321×140×310mm; approx. 9kg
Pre-owned - Good condition. Signs of light wear on top and sides. Please see photos.The amplifier is tested working and sounds great. It has just been serviced by the legendary Quad service department, Huntingdon at the cost of £169GBP.
The $1,108 asking price for this used Quad 909 is ambitious, sitting well above the 75th percentile of $931 and the median of $843 from your recent comparable listings. While the 1999-era 909 remains a respected, high-current design delivering 140 watts per channel with an unsurpassed midrange, this price point demands caution. It is not a bargain; rather, it reflects a premium that only justifies itself if the unit is in pristine original-owner condition with all accessories intact.
This amplifier is well-regarded for its ability to drive most speakers effortlessly and its mature, powerful sound, making it a worthwhile buy for enthusiasts seeking reliable British precision. However, given the price exceeds the median, buyers must verify the condition carefully, as early Chinese-made units suffered from poor capacitor issues. If this listing is clean and complete, it offers genuine upside; otherwise, the cost is simply too high for a used unit with potential age concerns.
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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