ARC REF 5SE, CJ GAT or ?

The Krell(s) tend to be more analytical with great bottom end extension. I would look for a pre amp with more warmth. At your price point you pretty much can choose anything you want, so I wouldn't be too hasty about a choice but would try several tube units before making an important decision for your system.

An exception to this would be to try a comparable Krell pre amp just to see what synergies may exist given that the Krell designers probably used their own products for final testing before releasing the amp to the public.

If you can live with the GAT's single ended RCA connections, I vote GAT. I've looked at and owned other preamps but have always been the happiest with my GAT. Great 3D and layering with an ever so slightly sweet top end with great width and height. I love it. Also, only two tubes to replace and relatively inexpensive to re-tube. At the prices for the used GATs right now, I think they are a bargain.

CJ GAT is the best preamp I have ever heard bar none.

Great query and tough question(s) Wemfan-

I have heard the ARC Ref5 SE w/ both ARC and Bryston power amps. I liked it best w/ solid-state power. On the C-J side, the highest model that I demo'ed and rather enjoyed was the ACT2 SERIES2. It also sounds outstanding w/ solid-state power. On my short-list to demo is the CJ ART3 and GAT. The ARC performs at its best w/ Transparent cables/cords. Audience is a natural, sonic match for CJ gear. Audioquest is a 3rd match. Tara Labs is a 4th.

Stated, VTL is an excellent performer-I do not know how it will compliment the Krell mono blocks?
VAC is another consideration for a tubed pre-amp.

PLease keep me posted and Happy Listening! =JA

cj because I like the sound of their components and they are reliable and they back them well. But at this level it is personnel preference.

Chuck