I'm looking into driving nixies and i came across this multiplexing circuit
I am a little bit confused about the chosen voltages. The 200v line I would assume is to meet the required strike voltage, if this is the case could it be reduced to the average 170v strike voltage?
My assumption is that the 110v line is to maintain the voltage across the tube. But that is considerably lower than the maintenance voltage for the zm1000. So what is the purpose of this rail?
Finally on the cathode side. It's connected to 75v then pulled down to the 0v potential, is 75v an arbitrary voltage, perhaps what was available from the supply? Why was this chosen?