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This is a buyer’s market for this category, and at US$399 the ask is a touch ambitious versus the recent used pool: it sits above the US$332 median and just under the US$421 75th percentile. That makes it a fair-to-high listing rather than a bargain, so it earns interest only if the unit is especially clean, well documented, or includes extras.
The PSU1 is well regarded because it’s a quiet, properly built outboard supply that can lift the performance of Graham Slee headphone gear with better drive, lower noise, and more composure. If the condition is solid and the seller can show careful ownership, it remains a sensible buy for someone matching it to the right system; at this price, though, the value case depends on cleanliness, provenance, and whether anything useful is included beyond the box itself.
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.
