I don't know about the PE770 but I have a Brother and a Viking for years now and use whatever thread I chose. Sometimes I might have to change the position where it sits but other than that its all good. I too use the same thread in the top and bobbin. I have different bobbin spool boxes for each machine, one had cotton thread and the other has rayon for embroidery. I just started a new one for C&C stretch thread. I love my machines because they both have decent hoop sizes and fairly good harp space, especially my Viking. Good luck with you quilting.