Sballs, Glad you're happy with Joe's Tube Tore. It is a nice starting place. But consider that it doesn't include any new production tubes which have varying tonal qualities and, if noise is your only real issue, that is still obtainable from some manufacturers. Quality NOS 6922's and 6DJ8's are really expensive, especially when you order some tested for low noise.
If you specified what tubes you have now and how you view their tone, and what tone you would like, you just might get some specific and helpful responses.
FWIW.