Shakedown...great choice of preamps! I really liked my SWL9.0SE Signature, (I have since upgraded to the Modwright LS100). Unless Dan changed something, you can't use anything but a 5687 tube, (or variant) in this unit.
If you are talking about the Amperex 7119 Holland tube, that's my favorite tube in that unit and I tried MANY different ones. You'll absolutely love this tube.
Happy listening...