The Mesa Boogie 12AX7 R2 ECC83 Gen Pak are unused older stock with generic tube boxes. The Mesa Boogie MESA 12AX7 Russian 2 is a premium-grade preamplifier tube. It’s designed to provide high gain output with an overall balanced tonal quality. You’ll also find that the MESA 12AX7 is both consistent and reliable in its smooth, balanced tonal response. The MESA 12AX7 is a lively, open, and expressive tube. Great in any brand of amplifier, not just Mesa Boogie.
CALIFORNIA PROPOSITION 65 WARNING
WARNING:Cancer and Reproductive Harm-www.P65Warnings.ca.gov.