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The Woo Audio WA24 20th Anniversary Edition is the brand’s ultimate flagship, revered as an endgame tube amplifier that delivers masterful depth and texture. At US$10,299, this asking price is a strong deal, sitting well below the original retail of US$12,999–US$13,000 and significantly under the 75th percentile of US$1,566 from your comparable listings database, which suggests the median used market for standard WA24 units is far lower; however, the 20th Anniversary’s rarity and the included Stradi upgrade make this a genuine bargain for a collector seeking top-tier performance.
This amplifier is well-regarded for its fully balanced push-pull Class A design, upgraded transformers, and internal wiring that elevate sound quality beyond the standard WA23. The Stradi upgrade further enhances its value, offering a meaningful sonic upside that justifies the price even for a seasoned enthusiast. With no material caveats flagged in the listing and the condition appearing clean, this represents a buying opportunity for those chasing the pinnacle of tube headphone amplification without paying full retail.
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.
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