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The Keeley Java Boost with an OC44 transistor is a highly coveted, 1960s-style germanium treble booster. It was designed to push an already overdriven tube amplifier into harmonically rich, saturated distortion rather than acting as a standalone overdrive.Key FeaturesThe Transistor: Early production units featured the highly sought-after, new old stock (NOS) Mullard OC44 germanium transistor. These rare transistors are largely responsible for the pedal's touch-sensitive, vintage British tone.3-Way Switch: Features a toggle switch offering three modes:Stock Vintage Rangemaster: The classic mid/treble focused boost.Mid-Boost: Pushes mid-range frequencies to make solos cut through the mix.Full Range: Allows lower frequencies (bass) to pass through, creating a fatter, more robust boost.True Bypass: Operates using a 9V battery or a standard negative-tip power supply, with internal trim-pots designed to perfectly bias the OC44.Tone and UsageTreble boosters are meant to shelve off muddy low frequencies and boost the mids and highs going into your amp. Because the OC44 is temperature-sensitive and highly reactive to your guitar's volume knob, this pedal shines best when placed first in your signal chain (before buffers or modern fuzz) and used with an amp that is already on the verge of breakup.Because genuine NOS OC44 transistors became extremely rare, Keeley transitioned to using CV7003 transistors in later Java Boost models. In mint conditions