The Rage Master (NKT275*) is a Treble Booster based on the legendary Dallas Rangemaster (RM): the British phenomenon of the 1960s and 1970s. It was the booster that defined the sounds of guitarists like Jimmy Page, Brian May, Eric Clapton, Tony Iommi, Rory Gallgher, Marc Bolan, Richie Blackmore, and many others. No, it's not a clean booster! No, it's not a flat booster! It has a distinctive midrange and mid/treble voicing to "open up" the tone and deliver creamy, cohesive, and, above all, defined distortion.