Temperature dependences of resistivity and current-voltage characteristics ofNbSe3single crystals intercalated with hydrogen are investigated in the temperature range 90–300 K in the normal state and in a state with a charge density wave near the first phase transition at 145 K. A state with nonlinear conductivity atT>145 K,IVC with a negative differential resistance, and low-frequency voltage oscillations in the state with the CDW are discovered. The results are interpreted on the basis of concepts of redistribution of intercalated hydrogen under the action of temperature diffusion and electric field during the propagation of a charge density wave. ©1998 American Institute of Physics.