This is a used Fulldrive 2 MOSFET modded so that the Boost switch acts as a true solo boost/clean boost. Two of the most common complaints about the Fulldrive 2 are that its boost switch adds gain, not volume, and that the Boost section only works when the overdrive is engaged. This mod fixes both of those things. Now the boost can be used separately as a clean boost when the overdrive side is not engaged or as a real solo volume boost when the overdrive is engaged.
Good used condition. Normal wear and minor scuffs. See pics above for details.