A thermoacoustic-to-MHD energy conversion is a potential key-technology for energy production in deep Space, due to the absence of moving mechanical parts or electrical contacts. Under financial support of EU grant agreement nr.312639, a small power ground prototype was designed by a combination of effort of the societies: HEKYOM, AREVA and the CNRS/Grenoble. It was constructed and tested in sodium laboratory of Institute of Physics, University of Latvia (IPUL). In addition to these partners the project involved also the Italian society Thales Alenia Space in Torino and HZDR the German Dresden group. The experimental results are presented in this paper. It summarizes results of several TAc experimental sessions, indicating the required temperature difference and working gas mean pressure. These are the necessary parameters needed for induction of acoustic power.