To restate Pdeher's comment any cable you appreciate now "of similar and reasonable length" will work fine with your tube set up. When I finally gave up using SS in my system I used the same cables I always had in place when switching to tubes. The sound was great and I became a tube convert no new cables needed.
Tube Amps and Cabling
I am contemplating purchasing a VAC integrated tube amp to replace my solid state integrated amp -- when I can afford it. Do you have any experience with the effect of this kind of change on cabling -- from solid state to tube amp? Did your cabling sound appropriate after the change or did the change require you to replace any cables?