Mixed conductive silver vanadate-phosphate glasses were prepared and their electrical properties were studied. Compositions of the glasses were characterized by parameters: x (AgI content) and r=[Ag2O]/[V2O5 + P2O5]. Total conductivity sigma(t) (x, r = constant) of a series of samples with fixed r values exhibited minima when plotted vs. x. The conductivity minima were accompanied by maxima of apparent activation energy E-t (x, r =constant). The observed dependencies were attributed to the ion-polaron effect (IPE), i.e. to electrostatic attraction between mobile species: electrons (polarons) and Ag+ ions.