triplets

[jutta]

Hi,
Two questions on triplets. I typed in the following code:
{
         \time 3/4
         \key g \major

         \times 2/3 { b''8[ b' g'] }
         \times 2/3 { b''8[ b' g'] }
         \times 2/3 { b''8[ b' g'] }
         }
Now, the figure "3" above each triplet is too close to the beam. How can I 
increase the space? (1 mm)
I would like to have the "3´s" above the beams only in the first measure. For 
the rest of the score I would like to "switch them off". What can I do?
Jutta