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Thanks for the fast reply. Crane - to perform the bias mod on the 20/20 - is it the same procedure as the the 50/50 ? From the 20/20 schematic, there appears to be dual bias controls - so that would mean a bias adustment pot for both channels ?

Hi All, this is my first post with the board so be gentle! I have a Mesa Recording Preamp --> Mesa 20/20 (deep mod) --> Marshall Vintage Quad. It's a great setup and I get comments about my tone all the time. However, I think the 20/20 is a little sterile sounding when you try to push it into...