The powerful pulse generator with target parameters 150 kV, 37 kA and duration of a pulse 150 nsec was described previously. The magnetic cores from amorphous alloys with ratio Br/Bs more than 0.9 were used as the key elements in the generator. We have carried out the processes of start, adjustment and have obtained the designed parameters. The researches on improvement of electrical durability of installation and the researches of losses in cascades of the generator have been carried out. The greatest attention devoted to the research of work and modernization of the second step of compression, to the reduction of its inductance with the purpose of reducing build-up time of a pulse. We managed to receive build-up time (at a level from 0.1 up to 0.9) of the generator pulse of about 40 nsec.