Would you consider breaking up the quad? I would like to try a pair in my modwright pre...someone in another forum here mentioned that they sounded pretty good. I'm currently using sylvania gb 5687s which are fairly sweet sounding with a nice smooth high end. They are not quite as resolving or distinct in the low end as a pair of tung sols that I have, but since the pre is combined with a krell amp, the tung sols are a bit too "bright".
Thanks,
Paul