I just posted this same tip. to "Quiet Tom Strategy" for Mass Hntr.

If you don't know, try to find out where they are roosting. Generally a non-gobbling bird means they are henned up. But, most toms will gobble when still on the roost to locate their hens. Then when they hit the ground they will go silient If you can locate where they are roosting and get in that area before light, then try a dominent hen call to get him to come to you. Sometimes even this will not work. If it is an old tom, he will get the hens to come to him and stay in his comfort zone. In this case though, he will be calling to them to let them know where he is. If this happens, you will need to find out his zone and find a way to get inside it before light without letting him know you are there. I carry a grunt call with me to disguise any noise I might make when walking to where I want to be. Let us know how you do.