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This is an amazing amp And a true titan in the world of high end audio! I have 600 usd in power tubes perfect matched set 3% winged c el34 a 500-600 dollars from 2004 early year from St. Petersburg also telefunkin medical grade G73R 12au7 only ones on eBay are 500 plus and sounds uncanny good 200 dollar nationals 6681 drivers tube matched set and let me tell you sounds so good so clean and so holographic. Clear as a bell wide sound stage with an amazing base. You can do your research the triode and pentode modes 25-45 wpc. I wanted to try a 300b or 45 amp willing to trade also! Is why I’m selling. I just got some 101 db speakers and just looking to try Dennis had or decware maybe! This is truly a amazing amp in and out just got the bug to look at something else. orifinal remote original instructions, original box it’s maybe 3 months used total full usb dac that’s sounds out of this world good basically brand new with 1300 worth of tube upgrades and shipping included folks anywhere in USA :). Mainland Local pick up and I drop the price naturally I’m in San Diego :) just message me and we will work it out.
This Unison Research TRIODE 25 listing at US$2,621 is a strong bargain, sitting right at the 25th percentile of recent comparable USD asking prices and well below the median of US$3,278. For a product that retails new for roughly US$4,500–US$6,000, this represents genuine entry-level value in the used market.
The TRIODE 25 is a highly regarded Italian tube integrated amplifier praised for its dual-mode operation, switching between 25W triode and 45W ultralinear/pentode configurations to match speaker sensitivity and tonal preference. It delivers rich, organic tube sound with EL34 power valves and includes a USB DAC for modern digital sources. At this price, the upside is significant: you’re getting a Class-AB, push-pull design with sub-out and tape loops, often owned by enthusiasts who appreciate its sonic warmth and build quality, making this a timely buying opportunity for a well-loved, versatile tube amp.
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.
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