This was my first headamp, and my first proper DIY project. It's incredibly simple to build and ridiculously cheap, but does have a few caveats. Advantages are that it sounds damn good for what you pay, but the disadvantages are that it can only be run off batteries unless you have/build a crazy quiet linear PSU (which would probably cost as much/more than the whole amp), the tubes are incredibly microphonic (they ring quite loudly unless well damped, and a bit even then) and the tubes are also pretty sensitive to noise (so make sure you put the PCB in a grounded metal enclosure).
I'm afraid I can't give any pictures or measurements because I'm away from my K272A right now, but I put it in an old cigarette box (a pretty big one) and was very happy with it for about eight months before it was superceded by my current amp. Essentially, if you're planning this as your first DIY experience go for it. Oatley were incredibly helpful with arrangements even though I'm in the UK, and even though I got mine picked up by a family member their postage is very reasonable worldwide.
(Also this should probably be in the main DIY section rather than the rules section. In fact, why isn't the rules section just completely locked anyway?)
Edited by JoetheArachnid - 11/2/11 at 4:33pm
