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This is a buyer’s market for the category: at £204, it lands above the £146 median but still below the £248 75th percentile, so it reads as fair rather than a standout bargain. It’s not cheap enough to call a steal, but it’s also not ambitious for a good example with the upgraded supply.
The appeal here is straightforward: this is a respected, no-nonsense solid-state headphone amp with a strong reputation for clean drive, low noise, and easy musicality, and the PSU1 upgrade is the kind of addition that can lift it from merely good to very satisfying. If the unit is tidy and fully working, that extra power supply makes the package more attractive than a bare amp at the same money, and it’s the sort of listing that should interest someone who wants proven performance without jumping into much pricier territory.
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.
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