  A transformation of supersymmetric quantum mechanics for N coupled channels
is presented, which allows the introduction of up to N degenerate bound states
without altering the remaining spectrum of the Hamiltonian. Phase equivalence
of the Hamiltonian can be restored by two successive supersymmetric
transformations at the same energy. The method is successfully applied to the
3S1-3D1 coupled channels of the nucleon-nucleon system and a set of Moscow-type
potentials is thus generated.
