For sale is an extremely rare Woo Audio WA4, custom built by Woo Audio to be headphone-only in 2011 (several years after the WA4 was discontinued). This amp sounds incredible and looks stunning IMO, but I know silver with towering monoliths might not be for everyone. I am the second owner and it's in excellent condition.

The WA4 is powerful and will drive any headphone with ease (HE6se for example). Has a high/low gain switch, but the noise floor can be audible with sensitive headphones depending on tubes used. Really excels with planars and high impedance or low sensitivity cans. To my ear, the amp creates a very wide soundstage with great width and imaging. It's a very clean sound with good extension in the bass and treble. Still gives warmth and tube euphonics to the sound sig. Vocals and center image is very present and detailed. Highly enjoyable listening experience. Selling because my headphone needs changed.

If you're looking for an awesome sounding tube amp, this is a one-of-a-kind beauty. I did reach out to Woo Audio though and they said while it's custom-built, they will service it in the future if that's ever needed.

Bundled in the sale will be a bunch of nice tubes (~8 Russian 6C19 power tubes, ~4 EZ80 rectifier tubes, 2 tung-sol 12AU7 driver tubes). I have more 12AU7 tubes for sale if you're interested. Shipped in original box. Will consider trades and partial trades.