Does this animal exist?

I wanted that for myself. A technical buddy and builder of a marketed pre told me that 6SN7s don't have the gain needed. I thought perhaps you could somehow run multiples but evidently not. If you want an Octal he said use a 6SL7 or the 12 volt version.
An example of the Octal preamp is the Cary AE Phono Kevin Deal at Upscale Audio has them.