We demonstrate an efficient energy conversion in a p-nthermoelectric couple built of bulk Pb0.95Mn0.05Te crystals grown by the Bridgman method and heavily dopedn-type with Bi (n=1.9×1019cm−3) or p-type with Na (p=2.3×1019cm−3). Substitution of Mn2+ ions for Pb2+ ions at the rock-salt lattice cation sites increases the band gap of Pb1−xMnxTe and decreases the energy separation between the light hole L-band and the heavy hole Σ-band. It results in a large increase of thermoelectric power and improved thermoelectric parameters of p-type Pb1−xMnxTe. Applying the Harman method for samples of various lengths, we experimentally determined the radiation correction factors and found the thermoelectric figure of merit parameter ZT=0.75–0.8 at T=650 K for both n- and p-type materials with good thermoelectric matching of the couple. We report on thermoelectric performance of a p-nthermoelectric couple assembled of these materials and tested over the T=300–670 K temperature region.