Acman3, I'd be careful about impedance compatibility when choosing a phono stage having a tube output stage for use in conjunction with the Tortuga LDR. It appears that depending on how the LDR is configured and on the attenuation value it is set to its input impedance may be in the 10K to 20K area, which will be too low to be optimal for use with many tube-based phono stages.
For example, Stereophile measured the unbalanced output impedance of the Rhea at 20 Hz as being 3.05K, which would certainly be high enough to be a concern in conjunction with a 10K load. And I would have suggested that you consider the Herron VTPH-2 that I use, but I don't think it would perform at its best with that kind of load impedance either.
Good luck. Regards,
-- Al