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Against your recent comp set, US$175 sits just under the median of US$183 and below the 75th percentile at US$192, so this reads as a solid fair buy with a slight edge, not merely a wash. It’s not quite a bargain-tier outlier at the 25th percentile of US$173, but it is close enough that a clean listing at this figure is still attractive.
The appeal here is the TA-66’s straightforward tube-integrated appeal: a warmer, more dimensional presentation than many budget solid-state amps, with enough power to make it a fun, characterful match for a wide range of headphones. At this price, the main upside is value if it’s genuinely well-kept and includes the stock tube set, power supply, and any original accessories; if those are present, it’s a stronger buy.
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.
