Audio Research vs YBA

My experience with the LS 25 mk2 is that it is forward sounding (because of the 6h30 tubes) vs. the mk1's with the 6922 tubes. The 6h30's are faster and cleaner sounding than the 6922's, while the 6922's are more laid back and have more bloom. Like Friz1313 said, the LS 25 or LS 16 is a safe bet, but make sure they are the Mk1's, not the Mk2's.

I tried a AR LS 25 with my Ayre V-5x amp and had very nice results - I recommend having SOME tube in your system, and it m,ight as well be the preamp (cheaper, less heat less wear/tear than the amp). Try one from your local dealer, and decide for yourself.

Audio Research gear is acutally a bit forward sounding and will not give you the kind of presentation you are looking for. I would recommend an AudioNote pre-amp - they all have a very liquid, soft sound, that does not sacrafice any detail. It is the way to go with the YBA amp.

I have owned the ARC LS25 mk1 and mk2. Avoid the mk2. Been using a Cary SLP-2002, which in my system is about 30% "better" than the AR MK1. YMMV