Has a anyone had any experience with "blackfacing" a silverface Twin? Mine is a 70's, 100W with a master volume. It's a nice amp but the clean tone has always sounded a bit brittle to me. I was wondering if one of the mod kits available might help richen the tone of the amp and get rid of the brittle sound. Any other suggestions to help the sound of this amp? Thanks alot for your help.