• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Help with Tube Buffer for passive pre

Hi all, I am looking to build a tube based buffered passive pre -- which I guess would be a cathode follower. I have built solid state ones (buffers that is), but I thought this might be a good first tube project.

There seem to be several 6dj8 circuits people use for this. I thought, however, I might branch out a bit and try it with a single 6sn7 instead.

I am looking for comments as to whether this tube is a good choice or whether the 6dj8 (or something else) is better. Also, any links to what to start reading would be greatly appreciated. I have not managed to find an existing circuit to start from online yet. Also, l looked at Frank's Ulitimate Tube Preamp, and while this seems to be the concept I am looking for, I think it is too much for a beginning project.

Thanks for any suggestions or help,