Yes. I would suggest putting a Mazda Cite 12au7 in the center pre amp position. I have it in my Cronus Magnum and it's outstanding. Crisp, clean, clear and a very 3D holographic sound without sounding harsh or brittle.
The Cifte is flanked by 2 La Radiotechnique 12au7 in my amp. All from Kevin at Upscale Audio.
I think you would be very happy with the above. You could start with the one Cifte and take it from there!