  We present a method to produce superconducting tips to be used in Scanning
Tunneling Microscopy/Spectroscopy experiments. We use these tips to investigate
the evolution of the electronic density of states of NbSe2 from 0.3K up to its
critical temperature (7.2K). The use of a superconducting tip (Pb) as
ounterelectrode provides an enhancement of the different features related to
the DOS of NbSe2 in the tunneling conductance curves, along all the studied
thermal range. The analysis of the experimental results gives evidence of the
presence of multiband superconductivity in NbSe2.
