Quote Originally Posted by Enochrome View Post
I have had those for about 2 months now. Very clear sound, but mine hum like a mofo!! I cannot tell if it is my Jolida amp or the EH.
I bought the amp with two 12AY7's in them, and that has a lower gain so that is not comparable in pinpointing the problem. So, I am not sure if I can recommend those.

Noob, recommended the Sovtek 12AX7LPS; they have long plates and are considered to be a great deal. I should have went with those; that will be my next purchase.
Look at the chart in the middle of the page.

12AX7 Tube Type Review