I am about to design a Nixie clock and at the moment, I am doing some research. However my doubt is how to treat Nixie tube. For example, a simple circuit for switching Nixie on and off with: anode resistor, nixie and common emmiter in cathode. If transistor is off, what is the voltage in collector? I suppose there should be: Supply voltage - Ra*InverseCollectorCurrent - Vnixie(InverseCollectorCurrent)
In this case what could be the maximum collector voltage in such a circuit and how to dimension my transistor?