Here is the mighty 1990's Marshall 9004 rack-mounted guitar preamp! This unit has just been freshly refurbished (pots cleaned; worn out power switch and channel switch replaced with new). It has been fully tested, and it operates flawlessly! It sound GREAT (just like a Marshall should)! As you can see in the pictures, I am missing one of the plastic knobs, which is the only bad thing there is to report. The 15VAC power supply is not Marshall branded, but is instead JBL.