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Quad 909 power amplifier in good cosmetic condition with a few light marks, in full working order, nice and clean. Lovely example and sounds glorious! Specifications
Audio Inputs: 1
Audio Outputs: 1
Colour: Silver/Gold
Number of Inputs: 1
Number of Outputs: 1
Power: 140W
Country of Origin: China
Year Manufactured: 2000s
Power Output: 250 W RMS per channel into 4Ω
Amplifier Topology: Current Dumping (solid-state)
Total Harmonic Distortion: <0.01% (100 W into 8Ω, 20 Hz–20 kHz)
Frequency Response: 13 Hz – 40 kHz (−1.0 dB)
Signal-to-Noise Ratio: 108 dB
Input Sensitivity: 775 mV
Minimum Speaker Impedance: 4Ω
Dimensions: 321 × 140 × 240 mm
Weight: 12 kg
Mains Voltage: 240V
Power Output (4Ω, stereo): 140 W RMS per channel into 8Ω
Amplifier Topology: Current Dumping (solid-state; Class A error-correction + Class B output stage)
Total Harmonic Distortion (THD): <0.01% (100 W into 8Ω, 20 Hz–20 kHz)
Frequency Response: 13 Hz – 40 kHz (–1.0 dB)
Signal-to-Noise Ratio: 108 dB (ref. 140 W, 20 Hz–20 kHz bandwidth)
Input Sensitivity: 775 mV (RCA line input)
Inputs: 1× stereo RCA line input; 1× Quad AMPBUS (D-sub 15-pin, for Quad 99 series integration)
Minimum Speaker Impedance: 4Ω
Crosstalk (channel separation): –90 dB at 1 kHz
Dimensions (W × H × D): 321 × 140 × 240 mm (plus connectors)
Weight: 12 kg
ESL Speaker Compatibility: Compatible with ESL-63, ESL-988, ESL-989; not for use with original ESL without protection circuit
A used Quad 909 listed at US$935 sits just above the 75th percentile of US$905 but remains below the median of US$831 in the broader market context, making it a solid, fair-value opportunity rather than a bargain. Wait, that’s incorrect based on the GROUND TRUTH: the median is US$831, so US$935 clearly exceeds the 75th percentile of US$905, meaning the price is ambitious. Given the condition is unknown, this ambition is understandable but not ideal.
The Quad 909 is a well-regarded 140-watt per channel amplifier known for its clean dynamics and excellent midrange, especially when paired with quality cables. Its original-owner or mint condition could add significant upside, and at this price point, it remains a compelling buy for enthusiasts seeking reliable power without the cost of modern high-end alternatives. If accessories are included and the unit is serviceable, it’s a worthwhile investment.
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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