Pete Millett has the latest Korg NuTube Portable Kit from Japan. I did a review at Pete's request but wanted to share here as well just in case anyone would like to build one. You can get the kit here. Pete translated the instructions to English so it's a pretty easy build, you just have to have a little bit of experience with an iron so you don't accidentally short any of the smaller solder eyelets. Bottom line: fun build with great tube amp sound on the go, and zero microphonics. I'd love to see a built-in DAC with the next version. If you decide to build one and need help, please feel free to post here.