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Unknown condition is the only real reservation, but at £1,250 this sits exactly on the three-listing median: fair market value rather than a bargain or an ambitious ask. It is within the observed £1,198–£1,277 range, so the price makes sense if the unit is clean, fully working, and supplied with the proper accessories.
The 550K is a seriously capable monoblock, offering huge headroom, strong bass control, and roughly 550 watts into 8 ohms or 750 watts into 4 ohms. Its line- and speaker-level inputs also make it unusually flexible, whether used conventionally or to boost a suitable integrated amplifier. Before buying, confirm quiet operation, healthy cooling, intact terminals, and that the seller understands whether this is a single unit or part of a stereo pair; otherwise, it looks like a sound, enthusiast-grade purchase at a defensible price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Musical Fidelity, a British hi-fi icon, traces its roots to 1982 when clarinettist and audio enthusiast Antony Michaelson founded the company in London. Disillusioned with the sound quality of existing gear after his stint at predecessor Michaelson & Austin, he handcrafted his debut product—a minimalist preamplifier dubbed "The Preamp"—on his kitchen table. Paired with the quirky Dr. Thomas power amplifier, these designs disrupted the market with their bold aesthetics and sonic punch, establishing Michaelson’s experimental ethos from the outset.
The brand has long centered on amplifiers as its cornerstone, spanning integrated, power, phono, headphone, and preamp models renowned for Class-AB topology and innovative touches like Nuvistor tubes. It expanded into streaming players, DACs, CD players, Bluetooth receivers, all-in-one systems, and even headphones and turntables, always prioritizing musicality over convention. Unconventional industrial designs, from curved heatsinks to sculptural panels, became signatures, influencing competitors.
Positioned firmly in the high-end arena, Musical Fidelity commands respect among discerning audiophiles for its value-driven performance and soulful sound. Iconic models like the A1 and F-series endure as collector favorites, blending accessibility with premium engineering. Acquired by Austria’s Audio Tuning in 2018, it continues evolving under new stewardship while honoring its heritage as a boutique force in British hi-fi.
See all Musical Fidelity listings on RADAR.
eBay UK
eBay US
audio-markt.de
Good
eBay UK
GB
eBay UK
GB
eBay UK
GB
