Tube to FET conversion?

[jimosity]

I know this has been covered somewhere before and I realize that "fets are not tubes" and all that, but what I'm wondering is this:
If I have a schematic of a tube preamp that I want to make into a non-tube unit, can someone explain how to do this conversion?
Preferably in a way that is easy to understand.

[anchovie]

Have a look at some of the schematics at www.runoffgroove.com and compare them to the schematics of the amps that they emulate. It should all make sense.

[aziltz]

specifically, look up runoffgroove's FETZER Valve Article.  They explain things very clearly.

[jimosity]

Thanks guys, I'll do some digging on this stuff.
Looking at the Uno in comparison to the MB MkI - looks like it's not going to be that difficult - still a little unsure; but it's at least not looking like at ancient Arabic.