This listing is for (2) brand new, factory fresh Tung-Sol 12AX7 Dual Triodes. matched for Gm within 10%. The Tungsol 12AX7 has high gain (we measure Gm=1750 and a new tube target is 1250), ultralow microphonics and superb linearity. The sound of this tube is full and musical, just like the original. These were great 30 years ago and they are back.