Russian made reissue of the original Tungsol.
The Ultimate 12AX7. Big, warm, and musical. High Gain, ultra-low microphonics, and superb linearity with a dynamic 3-D sound.
If you need more refinement in your preamp tubes, try out the Tung-Sol preamp tubes. This 12AX7 tube seems to have a higher gain than the Electro-Harmonix 12AX7 but is a bit more refined.