Just popped in a pair of black plate RCA 6l6s and some Telefunken ECC83s in my Type 3.. I really like the JJ GZ34s in the rectifier. The Teles bring a noticeable difference than the the Amperex tubes I was using.. not too sure if its my style, but they do dirty up a bit better. Might try out these Sylvanias I got a few weeks ago. I also did a bit of mixing pre amp tubes with a mullard in V1 before putting in the Teles.. got some cool sounds. What are you using.. and why? Anyone mixing pre amp tubes out there?