Thanks for your replay, going to try some EL34, just out of curiosity. Not sure which one to get, but I am really interested in NOS TESLA's and some Mullards.
About their durability. Not sure if this is true, may be, but for example NOS 6550 Tung Sol black smooth plates are like mummies, even they are dead, mean under minimum value, they still play good. So, concider that KT88 were step forward from 6550, they must last longer or at the same level as 6550 at least, I guess.
About their durability. Not sure if this is true, may be, but for example NOS 6550 Tung Sol black smooth plates are like mummies, even they are dead, mean under minimum value, they still play good. So, concider that KT88 were step forward from 6550, they must last longer or at the same level as 6550 at least, I guess.