Do you wan to build point-to-point wiring or a PCB? I've built several tube headamps over the years. I tend to gravitate towards Alex Cavalli's designs http://www.cavalliaudio.com/diy.html and have yet to be disappointed. I helped him prototype a couple of his amps (Stacker II--which never made it fully due to some stability issues with certain tubes, but was a wonderful sounding amp), and built one of the first point-to-point SOHA's which is still my main headamp. I've also built several of the Millett Hybrid's which are wonderful amps that worked quite well with my 32 ohm cans. Many at the GPAF liked them that listened to it years ago. In fact, I still have one of the original PCB's unpopulated and a populated diamond buffer for it that I will most likely never build http://diyforums.org/millett.html . These are great little amps that run on low voltage tubes designed for car audio back in the day and can be tweaked to your hearts content. They sold hundreds of boards and there is more info on building and troubleshooting than you would ever need, which is not the case with many designs.
I have a Millett Max board as well that I'll finish one day
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