jumping from a T752 to a Pass anything is quite a step; much less the X-250. I am switching back and forth between the NAD and my Curcio ST-70 (30 wpc EL-34 tube) using the pre outs. With the rolloff of the high pass filter in my ancient Vandy 2W; I probably get about 3 db more headroom from the little amp. I really don't miss anything from the bigger NAD. The little Curcio does sound sweeter. I just try to keep it simplified as much as possible for my tech impaired wife.
