Ruby 12AX7AC5 Preamp Vacuum Tube Finally Back In Stock! Expertly manufactured, our long-awaited Ruby 12AX7AC5 Preamp Vacuum Tube is finally back in stock after the factory closure. With a 2024 production date, this highly sought-after tube offers unparalleled quality and performance for all your audio needs. Upgrade your sound today with Ruby. HG: Our Standard Rating Of High Gain for high gain circuits HG+: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits HG+ 123: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits. Our 123 Variation provides a tube where triode side A tested with premium test results. HG+ 678: Premium Tube with extra close transconductance rated as High Gain Plus for high gain circuits. The 678 provides a tube where Triode side B tested with premium test results. All Magic Parts™ Tubes Are Tested Extensively For Quality Assurance6 Month Warranty On All Tubes
