No, the pre-outs are post volume control, thus not like a line out.
I think that maybe you could get a couple of switch boxes, one for your source (CD player, whatever), and one to switch between amp outputs. This will allow you to use your tube integrated for 2-ch. listening, and your receiver for HT. I understand that's not quite what you're trying to do, but you're probably going to have an interesting sound mis-match between the fronts and center if you just run the mains with the tubes and the rest off the receiver.
I would not try to have two hooked up at the same time. You're guaranteed to fry something.
Also, how much does the Jolida cost?