An experiment on the stochastic resonance in a bistable circuit with a tunn
el diode is reported. In contrast to previous studies, the signal-to-noise
ratio was measured across the load resistance. An additional narrow peak is
observed in the signal-to-noise ratio plotted as function of the noise int
ensity. A brief explanation of the effect is given. (C) 2000 MAIK "Nauka /
Interperiodica".