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The Unison Research S2 is a charming, low-power tube integrated that pairs beautifully with efficient speakers, offering a warm, musical sound signature. At £1,195, this asking price sits near the top of the current used market, where comparable listings in Europe and the US typically range from £1,250 to £1,350 (converted from ~€1,450 and ~$1,588). This is a fair, if slightly ambitious, price for a clean unit, not a bargain.
What makes the S2 worthwhile is its genuine Italian tube soul: it delivers lush midrange and natural timbre without the sterility of some modern amps, and it’s rare to find one in the UK market. If this listing includes the original handbook and remote (as some UK sales do for the S2K variant), that adds meaningful value. Only flag concerns if the condition is vague or tubes are aged; otherwise, at a fair price for a well-loved, rare tube amp, it’s a solid buy opportunity for tonal lovers.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Unison Research, an Italian hi-fi icon, traces its roots to 1987, when it was founded in Treviso by Giovanni Maria Sacchetti, a visionary electronics engineer and music enthusiast born in 1945. Sacchetti, who balanced a career in teaching with amplifier design, assembled a team of dedicated audiophiles driven by a singular passion: delivering profound musical pleasure through superior sound. From its inception, the company emphasized handmade craftsmanship entirely within Italy, evolving under subsequent leadership like Giovanni Nasta while honoring Sacchetti's legacy of innovation in tube-based audio.
The brand excels in valve amplifiers, its core strength, with legendary models like the Triode 20—the first integrated amp Sacchetti designed—and the Simply Two, which sold over 30,000 units and propelled global acclaim. Early offerings included the Glowy preamp and Ruler power amp, pioneering designs such as the first stereo amplifier using the 845 triode. Today, Unison Research offers a focused lineup of preamplifiers, power amps, integrated amplifiers, and select speakers in partnership with Opera Loudspeakers, prioritizing pure analog warmth over digital peripherals like DACs or headphones.
Positioned as a high-end boutique leader, Unison Research reigns as Italy's top tube amplifier producer and ranks among Europe's elite ten. Audiophiles worldwide revere its products for their emotional depth, artisanal quality, and timeless appeal, cementing a niche among discerning buyers seeking authentic, soul-stirring hi-fi that transcends mere technical specs.
See all Unison Research listings on RADAR.
audio-markt.de
Good
SoundTribe Asia
Dealer
Good
SG
SoundTribe Asia
Dealer
Very good
eBay US
audio-markt.de
Good
DE
audio-markt.de
Good
