The audio research arc line- from top to bottom.

Sorry, but the REF3 is better than the LS26. I never before would have said that with conviction, but Audiogon member Theo has a LS26 and he borrowed, from a dealer, the REF3. I went over, (THANKS again Ted!) and took quite a few of my demo CDs to listen to. We spent about 3 hours listening. I was WOWED to say the least. The LS26 is a great preamp, but the REF3 is in a different league.

I heard more bloom and air around the instruments and a much wider and deeper soundstage. Better and lower bass response and more edge detail in the upper frequencies.

I haven't heard the REF5, but Theo has and said that it is even better than the REF3.

I have read that the 6H30 tube will actually last around 10,000 hours. I know that ARC says 5000, but I think that ARC wants owners to always have the best sound, so they recommend a replacement more often.

The "DR" version of the 6H30 gives me more depth and width to the soundstage, better bass control, with a smidgen more deep bass. It also gives a better definition to the highs, with a smoother midrange.

I know at one time BAT only used the "DR" version, but I think that supply might be gone. The 6H30 tubes that I have seen come as a 6H30P, a 6H30P-I and the 6H30P-DR. The normal 6H30 tubes are around $30-$60 and the "DR" tube are anywhere from $160 to $400. I have also read that pre 1983 or so "DR" tubes are the ones to buy.

You might give Viktor at BAT a call or e-mail and ask him for sure.

Here is a link to some more info:

http://db.audioasylum.com/cgi/m.mpl?forum=tubes&n=218137&highlight=6h30+dr&r=

"The LS-16MKII is one of the worst preamps I have ever heard."

I totally and completey disagree! The LS16MKII is a marvelous sounding preamp. Very open and dynamic with excellent control. No, it doesn't sound as good as a LS26, but it comes pretty damn close.