Marshall Origin ORI50H Tube Guitar Amp Head (50-Watt) 50-Watt Head with FX Loop and Boost This 50W head enables you to express your personality. The Origin50H delivers classic, rich and harmonic tones with a contemporary, sleek style. This all-valve amp has power reducing features making it ideal for different environments from performing on stage to recording in the studio. With a 2-way foot-switch available you can turn the gain boost and the FX loop on and off.