Best Vacuum tube for Bellari VP129


I've currently got a Ruby 12AX7A tube in, but wondered if there was one that would improve performance noticeably?
bdogsquad
Maybe do some reading in the forums or check out some info that was sent to you regarding other resources for tubes.
I don't think that Bellari runs the tube very hard, so I would say at least 2000-3000 hours and maybe more.
Thanks. I may try that Mullard out. Wonder what the life is supposed to be with these?
The Sovtek 12AX7LPS is very good and not to expensive. There are a myriad of NOS tubes, but they are kind of pricey. Try a Mullard CV4004 from Upscale Audio.

http://www.upscaleaudio.com/Mullard-CV4004_p_5.html