JC120 Clean Channel w/ Tubes

[anevilspar7an]

Evening everyone, I am posting here to get some feedback and knowledge from the amp gurus here that deal with tubes. I am laying out a streamlined Mesa Mark IIC++ 2 channel head and instead of the Mesa clean channel I decided I would do a JC120 with tubes instead of JFETs. I know there are general rules when subbing JFETs for tubes, would it be as easy as doing that in reverse?

 

[Dostradamas]

Adding tubes to one of the most celebrated solid state amplifiers sounds like blasphemy for some reason

 

[anevilspar7an]

We do it all the time with tube preampliers, I figured it would be a worthwhile pursuit to see if the opposite would work, especially since the Mesa Mark II-C clean is lackluster. I would gladly bare the mark of heresy if it turns out splendidly.

 

[Blackboarcult]

The most hassle-free way of doing it is simply taking the Fender twin schematic and changing the tone stack values to those of the JC120. But... Which JC? There are at least 6 or 7 iterations of it, sometimes with significant changes. The only thing in common between versions is the huge headroom and complete lack of clipping.