Used Universal Audio UAFX Ruby '63 Top Boost Amplifier Guitar Preamp

Used Universal Audio UAFX Ruby ’63 Top Boost Amplifier Guitar Preamp in Good condition delivers authentic British chime, punchy mids, and harmonically rich breakup inspired by a classic ‘60s top-boost combo. Features UAFX dual-engine processing for detailed amp feel, a built-in boost for extra drive, and simple controls for gain, EQ, and output. Runs in mono and supports true/buffered bypass for pedalboard-friendly integration—perfect for recording direct or powering any amp and cab setup.