The 12AX7 Tungsol has high gain, ultralow microphonics and superb linearity. The sound of this tube is full and musical. $ 12.00 Customer Reviews 21 of 23 people found the following review helpful a tube for blues, February 17, 2011 By blues4you – See all my reviews Verified Purchase(What’s this?) This review is from: Tungsol [Description & reviews]