Maxon ST-9 Pro Plus Super Tube Overdrive Guitar Effects Pedal

Takes the basic design elements of a coveted vintage model and brings them into the 21st century Loosely based on Maxon's classic "808" circuit, it offers a dedicated mid control, 2 different diode types for single coil or humbucker pickups, and switchable 9- or 18-volt operation for increased headroom and response