For anybody into DIY, you can now carry Class A sound in your pocket by building this new Altoids tin amp design...
An experienced amp builder on the DIYAudio forums, xrk971, with the input of the ever-helpful community over there, is currently finalizing his design for this amp. In the works are a detailed bill of materials for the build, a circuit schematic, and hopefully even a group buy for printed circuit boards...all to be found in this thread:
"X" has run extensive simulations of this circuit as well as real-world measurements for THD and FR, and the results look stellar. Low noise, textbook-perfect harmonic distortion profile, and a razor flat frequency response. Solid bass. Plenty of juice, even for 250 Ohm cans (possibly higher). And most importantly... according to him, it sounds amazing. It runs slightly warm to the touch, and gets 4-5 hours of battery life.
What makes it most exciting to me is that it's noob-friendly with a low parts count, and all through-hole components except for the JFETs. I'm planning to build a couple, and I'll post my build and listening impressions on Head-Fi, in the DIY forum. I'm excited about this little amp project!