I don't see anything about this little amp, and I don't think I posted anything myself.
I built an Oatley Electronics tube hybrid headphone amp that uses pencil tubes, 6814 I think it is, and runs on a 9v battery. It is so tiny I keep it in a pocket of my backpack and get real tube sound through my Sennheiser PX100s as I ride the NYC subway. The best part is the price, $27 AUD as a kit. You'll need connectors and wire to build it. Batteries not included!
