Steve - Siminoff, in his book, talks about tuning the head, but I can't remember the tone - don't know if it was G, or B, or A ?? It involves muting the tuned strings with your hand or a strip of cloth loosely woven through them, and then tapping in front of, but near, the bridge with a padded hammer or piano key.

It didn't make a great deal of sense to me, and I agree with Rick - tighten until you get the tone you want, or until it pops, which is the tone you don't want!

Siminoff also has some info on making sure the resonator and "resonating cavity" are tuned. His stuff can get pretty complicated, but it's a worthwhile read for the basics.