Tube Buffer

[swinginguitar]

Can someone point me to a useable tube buffer schema?

Basically one that uses half a 12ax7 triode to do the ~unity gain hi input lo output impedance thing, such as an effects send etc.

Is cathode follower a good option?

[iccaros]

http://www.tubecad.com/2007/04/blog0103.htm
see of this helps, start at  More No-Gain—No-Pain

[defaced]

Yep, you're looking for a cathode follower.  Rk of 100k is pretty typical for driving things like tone stacks.  Add this to your reading list:
http://www.freewebs.com/valvewizard/accf.html

[Gus]

You left out a lot of information.
What voltage will you operate it at?
A 12ax7 as a CF?
Is this in a tube amp or a floor effect box or...?

IMO if at lower effect voltages I like emitter followers or source followers or opamp gain of 1 stages or other circuits better than a tube CF

[iccaros]

also to add, a 12ax7 makes a poor cathode follower for this purpose, you want a lower MU tube 12au7 is better suited.
Melins