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OTL tube headphone amplifier, utilizing 6N8P and 6N5P tubes (equivalent to 6SN7GT and 6AS7G). It is best suited for high-impedance headphones (Sennheiser synergy) and can also function as a pre-amplifier in a home audio setup.Works wonderfully, and well taken care of. Slight channel imbalance until you hit about 9 oclock, sending a lower voltage signal from your DAC will help greatly with this so you can get more play out of the volume knob.
Is US$250 the kind of price that makes you stop scrolling? For a TA-26, yes: it lands below the typical used range I’d expect from a model that retailed around US$319 and commonly shows up in the low-to-mid US$200s to low US$300s used, so this reads as a strong buy if the amp is complete and working properly.
What makes it worth grabbing is the classic OTL tube sound with enough drive for higher-impedance dynamics and a healthy 500 mW into 300/600 ohms rating, plus tube rolling flexibility via the 6N8P/6N5P setup. If it’s an original-owner unit with the stock tubes, box, and no hum or crackle, that’s meaningful upside; the main thing I’d verify at this price is clean operation, since a tube amp’s value drops fast if it needs immediate tube or power-supply attention.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
xDuoo is a Shenzhen, China-based audio brand that emerged from the country’s fast-growing hi-fi manufacturing ecosystem. Its exact founding year is not consistently stated in the sources available here, and no founder is prominently verified, but the company is widely presented as Shenzhen xDuoo Technology Co., Ltd., with roots in OEM/ODM production before building its own consumer-facing identity.
The brand is best known for headphone amplifiers, DAC/amp combos, portable DACs, tube hybrids, and other desktop-and-portable electronics aimed at personal audio enthusiasts. xDuoo’s lineup has included tube headphone amps, balanced amplifier designs, digital-to-analog converters, and all-in-one sources, typically positioned for headphones rather than loudspeakers or turntables.
In the market, xDuoo sits in the value-to-mid-tier audiophile segment, with a reputation for offering ambitious feature sets, lots of connectivity, and occasional tube-flavored designs at relatively accessible prices. It is not generally considered a luxury or vintage-collector brand, but rather a practical, performance-driven Chinese hi-fi maker with a strong presence among enthusiasts seeking high features per dollar.
See all xDuoo listings on RADAR.
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