A regularized solution of the hybrid Generalized-Multipole - Technique (GMT) / Moment-Method (MoM) method is presented in this paper. The study is focused on convergence and accuracy aspects of the solution, examining their dependence on the location and the number of the GMT and MoM sources. A Tikhonov regularization process is incorporated, which highly improves the conventional GMT-MoM solution and besides stabilizes it by reducing the condition number associated with the matrix formulation of the problem. Furthermore, the use of this regularization tool allows to overcome an important difficulty for the users of the GMT-MoM method, namely, its great dependence on the sources location. These ideas are verified by analyzing the convergence of the method for two-dimensional TE and TM polarized problems.