Audphile1:
The attached review compares the LS26 with the LS25MKII, as well as other ARC older preamps. I believe this reviewer hits the nail on the head:
http://www.drhifihousecalls.com.au/Reviews/ARC%20LS26%20Review/ARC%20LS26%20Review.htm
Hope this answers your question. If not, please provide more specific questions and I will be more than happy to respond.
The attached review compares the LS26 with the LS25MKII, as well as other ARC older preamps. I believe this reviewer hits the nail on the head:
http://www.drhifihousecalls.com.au/Reviews/ARC%20LS26%20Review/ARC%20LS26%20Review.htm
Hope this answers your question. If not, please provide more specific questions and I will be more than happy to respond.