cryod tube vs non-cryod tube

if you had two of the same tubes , one is cryod & the other not, what would be the diference???

diamonddude184142 OP Details Discussions Posts This discussion Message User 36 posts 10-17-2006 at 09:43pm Copy Comment URL Report Comment Edit Delete does it help microphonics?,like a 7044 tube. what do they usually charge to cryo a tube?