The retroFUZZ brings the iconic sound of the Rush Pepbox into the modern era, with enhanced functionality for today’s guitarist. Unlike the Pepbox, retroFUZZ has a BIAS and TONE control. The X-Ray version is an ultra matte black finish with a silver silkscreen print. Built around two select silicon transistors, retroFUZZ faithfully delivers the aggressive, raw tone of the original Pepbox, while adding new features for greater versatility. Volume: Adjust your output level with ease. Fuzz: Control the amount of distortion, from slight breakup to intense. Tone: Roll off low end as you turn it up, or set to maximum for the original Pepbox tone shaping. Bias: Fine-tune the second transistor’s operational point. Go from gated, sputtering fuzz at low settings to optimal vintage fuzz at noon. Beyond 3 o'clock adds asymmetry to the transistor clipping. The PCB design is a throwback to an earlier era, featuring exposed traces, curved tracks and teardrop pads. The retroFUZZ features a black 125B aluminum enclosure with top-mounted jacks. An external 2.1mm center negative 9v DC power supply is required (not included.) No battery jacks internally.