Audio Research preamp ratings & sound differences

I am not an ARC guru, but this is what I understand about the hierachy of recent ARC Pres. I am sure others will pile in and disagree. My understanding is the LS26 has a relatively poor response. The LS 27 however seems rated slightly above the Ref 3, as a newer model. The Ref 5 of course is top dog. I have heard the 27, 3 and 5, but not at the same time, so could'nt comment on sound differences

I've only heard very good sounding setups with ARC amplification on numerous occasions. Cant say that about many companies products, so that is a good omen.

The sp16 I use has been well reviewed and sounds lovely.

Which is best will depend on many things I suppose. But for the most part it all seems to be a pretty good place to be in general. Specs and personal preferences will of course vary widely and end results case by case will of course depend on many factors beyond the just the amp or pre-amp used.

I have not had any major issues other than tube replacements to-date but ARC customer service has been solid to -date as well, which means a lot. Good gear isn't worth much if it does not continue to work well over the long term. Older ARC gear seems to manage to stick around forever and retain decent value, so that says a lot as well.

Anyone else have a non-answer?

Had Sp8,SP10 and SP15(with Great Northern Sound updates) my Thoress preamp is much better better stage,imaging,bass and detail.