Call me old fashioned but when I see the comforting glow of a vacuum tube I know that I'm in for some sonic pleasure. And that's precisely the thinking behind the aim AS301DTS USB audio tube headphone amplifier. OK, so the vacuum tube doesn't actually work, it's designed that way to trigger the very mental connection I opened with. That done, the tiny device then promises to deliver bass-enhanced surround sound to just about any pair of headphones attached to it. Sweet.