Once the preamp has broken in a little more, you really should try different tubes to see if YOU like the difference. Forget what others have said, it really just depends on what you hear in your system.
I've had my MC2300 for over two years and for me, in my system, the Telefunkens made a very nice improvement in both the line stage and the MC phono stage.
I've had my MC2300 for over two years and for me, in my system, the Telefunkens made a very nice improvement in both the line stage and the MC phono stage.