[Pack66184]

I was wondering if anyone would share their experience with using a different set of tubes in the balanced positions versus the left and right channel positions. (Yes, I do use balanced interconnects throughout my system) I am finding a noisy tube and was curious if I could replace two tubes versus all six together. Of course I could stay with the current brand tube, but I have a interest in looking at Sylvania, Tungsol, and the ken Rads. I'm assuming it is correct to keep the left and right channels the same, how much effect would having a different matched set of tubes on the balanced position would effect the output SQ with the Cary preamp?