Looks like the Woo WA8 is now for sale. It's a portable DAC/transformer output tube amp. Here are some specs from http://wooaudio.com/products/wa8eclipse.html Class A amp, using two or three tubes (6S31B x 2, 6021 x 1) In house transformer... Nickel core, OCC single crystal copper Max headamp power out 350mW Sabre ESS9018K2M chip for the DAC XMOS USB input, and an analog input 3400mAh li-ion battery (up to 4 hours usage) Comes with a Pelican case Priced around $1800 Jude says he anticipates using it as his main rig for HD-800S... I question who wants/needs a portable rig for open dynamic headphones. Maybe I'm wrong, but I don't see the appeal myself. I think it might be smart for Woo to be custom winding the transformers in house, but I also question their ability to produce the quality of manufacturers like Cinemag. I also think $1800 is ridiculous. $800 maybe it would be worthwhile. Idk. Those are all just speculative thoughts based on what I've seen. Haven't heard it myself, but I posted on HF that $1800 could be spent on sound quality vs portability. Seems gimmicky in the way the WA7 had that glass top around the tubes. It looked cool, but I wasn't blown away by the sound quality.