  Motivated by experiments in nanoscopic systems, we study a generalized
Anderson, which consists of two spin degenerate doublets hybridized to a
singlet by promotion of an electron to two conduction bands, as a function of
the energy separation $\delta$ between both doublets. For $\delta$=0 or very
large, the model is equivalent to a one-level SU(N) Anderson model, with N=4
and 2 respectively. We study the evolution of the spectral density for both
doublets ($\rho_{1 \sigma}(\omega)$ and $\rho_{2 \sigma}(\omega)$) and their
width in the Kondo limit as $\delta$ is varied, using the non-crossing
approximation (NCA). As $\delta$ increases, the peak at the Fermi energy in the
spectral density (Kondo peak) splits and the density of the doublet of higher
energy $\rho_{2 \sigma}(\omega)$ shifts above the Ferrmi energy. The Kondo
temperature $T_K$ (determined by the half width at half maximum of the Kondo
peak in density of the doublet of lower energy $\rho_{1 \sigma}(\omega)$)
decreases dramatically. The variation of $T_K$ with $\delta$ is reproduced by a
simple variational calculation.
