CJ PV-14L replacement tubes


hi - I need some suggestions for replacement tubes for my CJ PV-14L.
not sure how much CJ will charge me and if I can get better tubes than standard.
Also, can anyone say if this is a straightforward job - haven't had the cover off yet. I assume the tubes can be simply pulled and replaced.
Thanks.
128x128johnmc67
Thanks for all the responses - very helpful. I believe they are 6C4 tubes as mentioned. Next rookie question - where can I buy them if not through CJ?
Thanks.
The tube store or tube depot http://thetubestore.com/ or http://www.tubedepot.com/ to name just a couple.

Chuck
I would stick with the CJ 8080's if I were you. They bought up a bunch of the NOS stock. The 8080 is a ruggerized military tube used in British walkie talkies. I have a pair in my CJ Pv-15.
Okay - maybe a dumb question. Why would the EC90s be so much better? Is this a typical approach?
Thanks.