Audio Research Ref 10 vs 40th Anniversary preamp

folkfreak......Ive had the Ref 5se and now the Ref 6... There is a night and day differ between them. Im wondering if the Ref 6 is closer to more of the Ref 40 anniv. 

I’d give a call to Randy at Optimal Enchantment in Santa Monica and ask him. He sold me my Ref 40 and now sells lots of Ref 10s. I suspect the answer is that they sound similar but that the Ref 10 delivers more of the same ... now I suspect we’re waiting for the Ref 50 in a year or two 😉