I have used the Tri-X 320 and Pyrocat-HD combination for pt/pd prints in the past.I would have to look up what my specific information was for Tri-X later when I get home since I don't remember off the top of my head. I have since standardized on HP5+ with Pyrocat at 1.5:1:100 for 11 minutes at room temp (I have the Jobo tanks, but no Jobo unit).