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Quad 520F Power Amplifier QUAD 520F Professional Stereo Power Amp. 100watts into 8ohm/ 160watts into 4 ohms in good working condition,with input/output adapters. 240volt WAS serviced by Dada, by previous Owner 1. All 4 PSU capacitors: 6800uF 63V PCB mount. 2. Two rail decoupling capacitors per channel 220uF 100V. 3. The bootstrap capacitor 47uF 63V. there are no other electrolytics in the amplifer. The only other non-film sound-affecting capacitor is C8 which I will evaluate and replace if necessary. All film capacitors are already OK. I will also have a good look at the input circuit. The lev
The asking price of A$799 sits just above the 75th percentile of A$790 from your ground truth data, making it slightly ambitious but not unreasonable given the model’s enduring reputation. While it exceeds the median of A$778, it remains within the tight range of recent comparable AUD listings, so fair value is still in play rather than a clear bargain.
This Quad 520F is a well-loved, transparent, and dead-quiet 100-watt current-dumping amplifier from 1984–1995, prized for its clean headroom and compatibility with classic speakers like the NS10s. At this price, if the unit is in original-owner condition with no missing accessories or known faults, it represents a solid buying opportunity for an enthusiast seeking reliable, vintage performance without the hype of newer brands.
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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