Thank you Sean for the tur06 v2 impression. I will get it upgraded for sure when I have a trip to Japan (hopefully this year).
@ian, big thanks to GG finally I can get a pair of diamond telefunken df96 tubes. I will post more impression once I get them. And I will use GG cleaning kit on them.
@wnbc, i have to wait 4-5 months to get my tur06 no.4. I believe now it will took 6 month the least. It was really a very long time to wait but once I got it, the tur06 really performs beyond my high expectation. It simply the end of journey for my portable amp quest.