Wow, cool Eno. Yes you could do it that way, but why not use the power section also? Looks like it's in good shape! 12AX7 selection is infinite. Top notch would be some NOS Amperex or Mullard. For new I have read good things about the Electro-Harmonix.

For NOS I think this guy is the best, you should drop him an email. Very accessible and helpful. His site also has lots of great knowledge.

www.audiotubes.com

For new stuff I would look at this. They are in Canada however.

www.thetubestore.com