A creamy, harmonic-rich treble booster built around a hand-selected Mullard OC44 germanium transistor—perfect for pushing tube amps into glorious saturation. Inspired by the classic Rangemaster-style circuits of the ‘60s, it adds bite, bloom, and sustain to your signal, especially when dialled into a cranked British amp. A 3-way locking tone switch offers treble, mid, and full-range boost modes, letting you tailor the character from glassy sparkle to warm grit.
Video: https://youtu.be/VlvFQldHtvs&ab_channel=KeeleyElectronics
Product Specs
- Item Number: 37039
- Make: Keeley Electronics
- Model: Java Boost
- Condition: Excellent
- Finish: Silver
- Categories: effects-and-pedals ⇒ overdrive-and-boost ⇒ pedal
- Function: PreAmp
- Made In: United States
- MPN: 37039
- Modular Grid: Pedals ⓘ ＋
- Dimensions*: 68 mm wide 112 mm high
- Power*: ? mA / 9 V DC / Negative Center
* User contributed details