Best Phono Tubes for the Hovland HP-100

Looking for advice on the very best phono tubes for the Hovland HP-100. Got a set of Mullard's from Upscale Audio; the cv4004 and 6201...have been disappointed with these. They seem to be fairly noisy...

Since I am using KHorns I need something as quiet as possible!
These are derivitives of 12AX7s. If you want super-low noise tubes, these are going to be costly. See