According to
@pctazhp's experience, Mullard 6080 is nothing similar to GEC 6AS7G, thus I go for the Mullard 6080WA since some review suggests 6080WA has the similar sound to GEC 6AS7G. I might purchase another pair of GEC 6AS7G next month in UK to compare it with Mullard 6080WA in order to confirm whether they are similar or not, find a reliable tube supplier, will be more expensive but will save me some energy to worry whether it is authentic or not if buying them from China.
But your 6080 is something else, it has YM and YK after the 6080, what does YM and YK stand for? Is it a Mullard's 6080?
Again, Elise thread is the best thread ever I've come across on head-fi. You guys are just so helpful. Very satisfied.