garp, you will still need a preamp even with the phonostage. so just sub a 250K ALPS instead of 100K and you save on the hassle of putting in another tube as CF.
but if you insist, here's a cathode follower for you
12AU7, plate at B+ of 250V, Rk = 20K, then put a cap (around 0.33uF) from 12AU7 cathode to output, then Rl = 100K (output to ground)
this gives a gain of .92, Zout of 441 ohms