I have been doing some research to better understand the role that power tube type and saturation plays in our profiling process and why some profiles work better than others for me in various situations.
I found this discussion on power tube type and properties and the inherent relationship to the potential sound and feel of the amplifier. Perhaps this is old news to many but thought it interesting to keep in mind as we pick amps and power tube types and at what levels of power stage drive we profile an amp.