The LS26 can be made to sound 98% as good as the Ref 3 by doing a couple mods. I added 4 bypass hot rod dynamicaps .01uf 500v to the main output caps and did some dampening on the Main board and relays.
Also make sure you keep the tube dampers as high as possible on the tube and tight against each other.
We did a blind A/B test with the Ref 3 and no one could tell which one was playing.
www.atlanticprosound.com/LS26mods.jpg
www.atlanticprosound.com/LS26mods.jpg