There are two basic variants if the Marx Generator. One uses resistors, and the other uses inductors. The principal remains the same in both. The input voltage charges the capacitors via the resistors or inductors. When the breakdown voltage of SG1 is achieved, the first two capacitors are connected in series via the spark gap. This raises the voltage sufficiently to achieve the break down voltage of the rest of the SGs, which are set a little wider than the first. As it is much easier for the charge to travel through the arc of the spark gaps, the resistors or inductors suffice to prevent series connection.

R7 is used on the input to smooth and reduce jitter. It can be omitted, but it may be more difficult to adjust the spark gaps. I have tried a bunch of resistor values ranging from 500k to 10 mega-ohms, and have found that the wattage and physical length is more important.

As you can see, this schematic simply interchanges the resistors with the inductors. I have tried a variety of inductors, and have found that the values don't seem too critical. Mind you, I am not seeking the ultimate in performance and efficiency. If it works, I'm happy!