Ok today I was looking at schematics when I saw a Marshall amp schematic and had a idea. Would it be possible to build the pre-amp of a Marshall or something and put in a stompbox or pedal enclosure? This would be great for my Blues Jr. because it has awesome cleans but I dont really like the overdriven/distorted sound to it and I love that type of Marshall distortion. I was thinking putting tubes in like the Seymour Duncan Twin Tube Mayhem. Would this be possible to make and would there be any problems? Thanks