For sale Marshall JMP-1

Getting out of the rack game. This is a cool guitar preamp that is actually what dusty hill of zz top uses to get his aggressive tone. The master volume knob makes noise when turned so, it should be replaced, although I left it in the same position and never bothered to. The headphone jack is missing its plastic cap. Again, I never used it so, didnt bother ordering one. $400 shipped in the 48 states.