Shelly,
Here's a piece of the 747 tube setup sheet, at least according to the Boat Anchor Archive, which is usually pretty correct. I've highlighted the 5998 settings, but since I've never used a 747 tester I can't really tell if they make sense.
5998
Here's the 6AS7 info, which maybe you can match to your manual and see if they are the same. That might serve as a good check that the 5998 data is correct.