The Ruby 12AX7AC5 preamp vacuum tube delivers the versatile, warm tone that guitarists and musicians crave. With its high-gain rating and premium components, this tube enhances your instrument's sound in high-gain circuits. Its durable construction and tight tolerances provide consistent, noise-free performance whether practicing at home or performing on stage. Upgrade your amplifier or preamp and rediscover the responsive, articulate tone hiding in your instrument.