12 volt tube amplification?

If anyone has any thoughts regarding tube amplification for car stereo or can recommend a manufacture please do let me know. A google search reveals a few possibilities. All older type car radios used to be valve driven. Is it possible there is a kit for those with schematic/soldering skills?
I have never heard one, but was told that it is based upon a David Berning EA-230 tube amp design...check it out.
I thought Bottlehead was working on something like this for car stereos. Send them an email, I bet they can point you to something.

If you are looking for 12vdc for your home amp, the Berning is a good option but you'll need very high efficient speakers.