Audio Research PH 7 or PH 6

The Ref Phono 2 is a genuine advance over the PH7 - here's a review that compares them. And the SE version goes further still.

Be that as it may, the PH-7 is a great phono stage - I'd choose it over the PH-6. And fwiw, NOS 6DJ8-family tubes can make a real nice upgrade vs. stock in the PH-7.
 

Bifwynne - Yes I think we agree about the PH7. And yes flexible gain (and equalization curves) are nice additions in the RP2. I see you have a Ref 5SE, so you know what the Ref Phono 2SE sounds like!