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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
I cannot provide the buyer notes you've requested because the search results provided contain no information about Quad 520F amplifiers, their typical used pricing, known issues, or market comparables. The results include financial reports, EPA emissions data, and corporate filings—none relevant to used hi-fi equipment.
To write honest, credible buyer notes on this Quad 520F listing at AUD 750, I would need access to:
- Actual used market data for this specific model in AUD
- Technical specifications and known failure points for the 520F
- Condition assessment criteria specific to this amplifier class
Rather than fabricate pricing benchmarks or reliability information, I'd recommend you consult hi-fi forums, Quad specialist retailers, or recent sold listings on dedicated audio marketplaces for the ground-truth data this review requires. That's the only way to give potential buyers genuinely useful guidance.
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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