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The WA6 has long been a respected, slightly romantic tube amp, but its used value is very generation- and package-dependent. At US$900, this looks fair to a touch ambitious for a plain unknown-condition unit; it’s not a steal unless it’s a later-gen example with upgraded tubes, rectifier, or box/accessories.
What makes it worth a look is the sound: rich mids, easy drive with many dynamic headphones, and that forgiving, “big” tube presentation Woo is known for. If it’s clean, fully functional, and includes the stock power cord plus any premium tubes or upgrades, it’s a solid buy; if not, the price should leave room for tube replacement or service.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Woo Audio is a New York-based high-end audio company founded in the mid-2000s, with 2006 widely cited as its launch year. It was built by the Wu family, with Jack Wu as the public face of the brand and key design influence, alongside family members who helped shape the company’s early growth. Its roots are in tube electronics and a strong appreciation for live sound, which has remained central to its identity.
The brand is best known for vacuum-tube headphone amplifiers, especially models such as the WA series, along with electrostatic headphone amplifiers like the WES. Woo also makes a smaller range of speaker amps, plus related audio accessories and cables, while its website and retail focus remain centered on amplification and headphone-oriented listening rather than source components or turntables.
In the market, Woo Audio sits firmly in the boutique high-end niche. It is respected among headphone enthusiasts for handcrafted, valve-based designs, substantial build quality, and a distinctive sonic character often associated with warmth, scale, and refinement. It is not a mass-market brand; instead, it appeals to serious buyers looking for premium, specialized amplification with a strong American-made identity.
See all Woo Audio listings on RADAR.
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