Abstract: This pulse generator which is of the Marx generator type and is applicable to obtaining high pulse voltages cmprises n+1 capacitors connected n parallel by resistors and spark gap switches for discharging said capacitors into a load circuit, in such a way that if V is the charging voltage of the capacitors, the voltage applied to the load circuit is equal to (n+1)V. This generator is characterized in that the capacitors and spark gap switches form a stack of circular plates, which are provided with axial openings. These plates and the resistors are located in a tight enclosure containing a gas aiding the priming of the spark gap switches, which is triggered by the radiation of a source passing through the opening.