To CAJames:Thanks for your comments,that's helpful!
To JOMAN:Besides Telefunken EL84 ,I also tried reissued Mullard EL84 and GoldLion El84 made in Russia,I've the same feeling as you:they sound good,but..after some time,I come back to 6P15P sent by Decware
Sincerely Thank you for your recommendation.Actually I've noticed CryoTone EL84 through the forum.On early February,after some brief talk with Don, I've placed an order around EL84,except that the input tube I changed to 12AU7.It seems that Don prefers EL84. But at the check out stage,the system shows that my address is not supported..Don said he would find out it,but till now still not supported.I plan to ask some friends for help when they would come back from US.
Now I live happily with Telefunken 12AU7 + 6P15P.With this combo,I've heard rich inner details and emotions that I've never heard before.Sometimes it feels like I'm listening to these records for the first time.The SE84UFO25 is really transparent.The music is full of vitality,especially on vocal and string music, I don't want to shut down and have rest.Maybe I'll stay at this stage for quite some time.