We have investigated mixed electronic-ionic conduction in 0.5[xAG(2)O.(1 - x)V2O5]-0.5TeO(2) glasses, where the Ag2O amount varies over a range of 5-40 mol%. The glass samples have been prepared by quenching the melt. The ac conductivity has been measured at frequencies from 10 Hz to 100 kHz and temperatures of 300-425 K. The data indicate that the conduction mechanism changed from being predominantly electronic to ionic for Ag2O contents of > 27.5 mol%. This transition is due to the change in glass structure, which affects both electronic- and ionic-transport properties. The electronic dc conductivity results have been analyzed in terms of a small polaron-hopping model.