I found this on a quick google images search for "12au7 starving student schematic"
It can also be found HERE In the great Starving Student thread.
RE my statement about the kaidan amp.
There is a schematic in the first post. I read it, and theres more stuff going on in the "audio" section. You will also need to build a high voltage power supply VS just buying a power brick for the Starving Student which adds still more stuff.
On that note, no, I have not built the kaidan amp myself. It seems like it could be nice, but is without a doubt a more involved build than a Starving Student.