Stick with the EL34's. The V12's sound with the KT88's (Svetlana's) was bland and lifeless. Dynamics were also squashed and constricted. Don't waste your time and money! I still have the Svetlana KT88's with only a few hours on them just gathering dust! If you still want to experiment, contact me and I'll sell them to you cheap! FYI, the Svetlana EL34's are much better than the stock RUBY's. In my opinion, this is a much wiser and significant upgrade than fiddling with other tube types. Good luck!
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