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At £325, this sits above the usual used range for the PSU1 and is clearly ambitious versus the recent GBP comps, with the median at £245 and the upper quartile at £285. It’s not a crazy ask if the unit is pristine and complete, but at this level it needs to be excellent condition rather than just “working.”
What keeps it interesting is that the PSU1 is a genuinely worthwhile upgrade piece: Graham Slee’s power supplies are well regarded for cleaning up and stabilizing the presentation of compatible headphone amps, and they tend to stay desirable because owners buy them to keep. If this one is boxed, original, and well cared for, the appeal is real; if not, the premium over market is hard to justify.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Graham Slee Projects, founded in 1998 in the UK by engineer Graham Slee, traces its roots to his extensive career beginning in 1974. Starting in audiovisual engineering, he advanced through printed circuit design, electronics manufacturing, and broadcast audio, serving as a senior engineer for BBC studio contractors before freelancing in hi-fi. This deep expertise laid the foundation for a brand dedicated to precision audio electronics, all handmade in British workshops.
The company specializes in phono preamplifiers and headphone amplifiers, developed in tandem since 2000 to mutually enhance performance. Flagship phono stages like the Accession MM, Reflex M, Era Gold V, and Revelation excel at extracting superior detail from vinyl, while headphone amps such as the Solo Ultra Linear and Novo deliver refined, high-fidelity drive. Graham Slee also offers DACs, focusing on compact, synergistic components for vinyl enthusiasts and headphone users rather than speakers, turntables, or cables.
Positioned as a niche boutique in the high-end hi-fi market, Graham Slee earns acclaim among discerning audiophiles for its uncompromised sound quality and value. Free from mass production, its products prioritize musical transparency and build integrity, appealing to serious vinyl collectors and headphone aficionados who seek understated excellence over hype.
See all Graham Slee listings on RADAR.
