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Timing matters a bit here because this is a current-generation xDuoo tube amp, not a collectible older model, so the value is mostly about condition and included extras rather than age premium. At US$215, it sits just above the US$200 median and inside the normal spread of recent asks, so this reads as fair rather than a bargain or an ambitious ask.
That’s still a sensible buy if the unit is clean, complete, and working quietly. The TA-66 is well liked for its warm, smooth, spacious presentation and is an easy entry point into OTL tube sound, especially with higher-impedance headphones. The main thing to confirm is practical stuff: matching voltage, no hum or grounding noise, and that the tubes, power supply, and original accessories are all present.
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.
