Tube stage for CD player?

I have a Harmon Kardon CD player that is o.k. but the sound I get from vinyl is so much better. Is there a tube device that I can insert between the CD player and the pre-amp? I have a 12ax7 triode pre-amp with a Son of Ampzilla power amp. The CD player puts out a 2v signal and that's what I want from the Tube based link. I would just like to run the CD signal through another set of tubes. My phono stage uses 12ax7's. Is there something simple out there? Thanks.