Rhanechak, as you might have gleaned from the responses, there may be some confusion as to what you are looking to achieve.
The Sonic Frontiers "A Taste of Tubes" is
here. It is a good primer to what tubes are and what they do.
A cool guide to vacuum tubes for amps written from a slightly different perspective is
here. It is more easily understood after having read the Taste of Tubes.
One of the reference papers is Hamm's
"Tubes vs Transistors".
Finally, if you do some searching on the internet as Ckorody suggests, there is ALL kinds of stuff out there. The most recent reference I have found and am working my way through is
here. There are lots more, probably many which are more worthwhile. This just happens to be the latest I came across.