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This paper presents the Speech Technology Center (STC) system submitted to NIST i-vector challenge. The system includes different subsystems based on TV-PLDA, TV-SVM, and RBM-PLDA. In this paper we focus on examining the third RBM-PLDA subsystem. Within this subsystem, we present our RBM extractor of the pseudo i-vector. Experiments performed on the test dataset of NIST-2014 demonstrate that although the RBM-PLDA subsystem is inferior to the former two subsystems in terms of absolute minDCF, during the final fusion it provides a substantial input into the efficiency of the resulting STC system reaching 0.241 at the minDCF point.