For the classic Tri-X look, try HC-110, dil. B (go to for the data sheet with suggested times) or for a little more speed but normal contrast, try Acufine (start with the times on the can, but I recommend rating TX 400 at 800 instead of 1000 and TXP/TXT 320 at 640 instead of 800). Tri-X is also great in PMK or ABC pyro, depending on your use, but you asked for no "exotic" formulas.