The secret to a great amp...is the fuse. When you bought the amp was it mediocre? I can see Bruno Putzeys and Lars Risbo brainstorming when they were designing the purifi amp and they came to a point when they realized their amp.. well just wasn't very good, mediocre at best, Bruno had a light bulb moment and said "I know what would make this amp great! An Orange fuse! ", Lars slapped him on the back and said damn Bruno you saved our azz on this one.