PrimaLuna Dialogue Premium amplifier or Audio Research Ref 75?


I own a Dialogue Premium (DP) amp and really like it. What's not to like? Build quality, easy tube rolling, auto biasing, great sound. I also owned the DP preamp, and it was equally as great, but I recently replaced the DP pre with an Audio Research Reference 3. At nearly triple the price when new, the ARC should sound better and it definitely does.

I have owned ARC gear in the past including the VT100 Mkii, and the VT200. Both were great amps, but I had to downgrade a decade or so ago, and now I am scaling back up. I have long been impressed with the reviews of the Ref 75 amp, and now I'm considering acquiring one, but I'm not so sure it will improve the sound quality for me. I don't need the extra power, and the DP has autobias and allows for tube rolling. I'm even wondering if changing from the KT77 I'm using to KT120 or KT150 would close the gap if there is one between the DP and the ARC.

Does anyone have experience with both? I don't need to be told that the DP or the ARC sounds great. I'd like to know if anyone has first hand experience with both?
audiojerry
Interesting - I had read that Wilson voiced with ARC but not ProAc. But it coincides with my experience. Before downgrading I owned several ProAc models paired with my Audio Research: Response Tablette Sig, Response 2, Response 1SC, Response 1.5, Response 2.5, Response 3.8.

My lease favorite was the 3.8, and the one I miss the most is the 1SC. The 1SC often commands a resale price higher than its original if you can find one on the market. 
my understanding is older wilsons were voiced on spectral and krell amps, don’t know more recently

i agree the r3.8 traded midrange beauty (and efficiency) for bass response (which in turn was the criticism of the response 3 and 3.5 preceeding it) - the tradeoff removed some of the ’humanity’ from the critical midband - i still have my set of r3.5’s as well as a more modern d30r which somehow have resolved the tradeoff nicely ... 
Jerry,
I have owned a PL Dialogue Premium Integrated about 2.5 years. I tube rolled With KT77s then KT120s and settled on the KT150. 77s had lean mid bass, 120s were too cold sounding, The 150s have no downside to me. They are powerful, tonally neutral and create a presence I really like.