This used Keeley Java Boost is a must-have for players seeking vintage-inspired treble boost tones. Designed to push tube amps into rich, harmonic overdrive, it delivers classic 1960s and '70s-style sustain and clarity. Featuring a three-position toggle switch for treble, mid, or full-range boost, it offers versatile tonal shaping to suit any setup. Built with high-quality components, this pedal is based on the legendary Rangemaster circuit, using a germanium transistor for warm, dynamic response. The simple control layout includes a single Boost knob, allowing precise gain adjustments. This unit is in good condition with normal wear and functions perfectly. Whether you're looking to cut through the mix or add vintage grit to your sound, the Keeley Java Boost is an excellent choice. Runs on a 9V battery or standard power supply (not included). Don't miss this chance to own a sought-after boost pedal that enhances tone with pure analog warmth.