There was a contest on a new review website and I won. Out of the prizes I selected the Brainworx ENGL E646. This is what I came up with to get the Judas Priest Firepower albums tone. You can cut back the boost and or gain, plus adjust the Low Cut EQ int he X slot.
Guitar I used was a Les Paul with JB pickups, tuned to D standard with Ernie Ball 11-54 strings