Audio Research Ref 10 vs 40th Anniversary preamp

My vote is for the Audio Research Reference 10 preamp which works extremely well with any solid state power amplifiers (the best of both world)...I have personally compared all three preamplifiers in my system and ended up with the Audio Research.  The Ref 10 is the end game preamplifier...and it is so much fun to own especially when you could roll some tubes and get a different taste!

Ref 10 for sure.  Have 1300 hours on mine.  Its wonderful.  Never heard any aggressive treble.  Its very musical. My friend was listening to the system while I was testing tubes for his ARC vintage preamp.  Said was sweet airy, excellent depth and width.  He loved it.

New REF6SE is said to close the gap to the REF10 and might be worth a listen.

Randy at Optimal is just a gem, give him a call.
@folkfreak what new speakers ? I have heard the VTL sing with Vandersteen 7 in San Diego

I think one had better be sure to replace tubes in the tube regulated power supply in the Ann 40  on a very regular basis...or be prepared for repairs that can get costly! Personally, I would take a pass on a design that utilizes tube regulation.