Parameters that change with Tube Type?

stm113

Power User
Hey all! I know we have in the past gone back and forth about whether or not changing power tubes changes the tone. My understanding is that when you select different power tube type in the AF2, certain parameters change which is one of the reasons you don’t hear the difference so much, and if you were to change those parameters to the original values you’d hear a bigger difference.

Does that sound correct? If so, does anyone know all of these parameters?
 
Hardness definitely changes with tube type for preamp tubes, I assume it does for power tubes too.
 
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