Mesa mod info/tech notes?

[schnarf]

Does anybody have any info about the Studio Preamp IIC+ mod? And more generally, does anybody have any mesa tech documents that are harder to find? I've found e.g. instructions for modding the 50/50 and Mark IV schematics that describe a "power amp stabilization" mod, I wonder what else is floating around. I'll attach what I've got.

 

[sakithh]

It is common to change the ratings of several capacitors in the amplification stages to reduce "thump" in the lows and add the characteristic IIC+ focus in the upper mids.