I think it's quite difficult to point out shortfalls in the given headphone segment (premium) but I do find the sound of the lcd-x more pleasing to my ears, hd800 have an amazing soundstage....unfortunately with certain music it just does not sound realistic....electronic music is a whole...

Great guide indeed! Being an avid tube fanatic as well I can only commend you on the exerted effort! I have not had any experience with this particular tube either, however I can strongly confirm MarioD's statements regarding Russian tubes, and perhaps add that while you should aim for...