Fan in Audio Research tube pre-amp

No fan in the LS26 and I suspect not in any of the other preamps you list. Tube preamps typically do not run hot enough to require a fan. Tube amps, including ARC models like the Ref 110 do have a fan as do some of their solid state amps like the SD135 which I owned.

If the ARCDB is still up and running it was/is an excellent resource for this kind of info.
As an aside I noted a tube power amp by Synthesis required an "ultra Low Noise fan" using the entirely encased design shared by many ARC tubed power amps. I can't judge if it is a detriment or not because I have not actually heard an amp with a fan for any length of time. Intuitively it would seem like a bad idea especially if it doesn't have its own isolated circuit. Sort of like turning on a blender in miniature while watching TV (Old TVs anyway).

No fan in the ARC Ref2 II, Ref 3 or Ref 5. I can't think of any ARC Pre that has a fan? But I dont know them all.

And the ARCDB is indeed a great site http://www.arcdb.ws/

TD

There is a lot of fans of all of these preamps, and yes, some of these fans are very vocal about their love of them! Does that make them loud? I don't know, but I see some of them typing in all caps - which I think is the equivalent of shouting ; )

For the most part, ARC uses fans in some of their amps, but I don't know of any current or recent model preamps with fans. I have owned two ARC preamps, neither with fans for cooling.