I'm struggling to get my head around this. But considering the following setup for a nixie tube, wouldn't the voltage across the cathode transistor be close to 0? Most of the voltage should be dropped across the tube itself, with the remained dropped across the current-limiting resistor, right? Does it have to do with the transistors keeping the other cathodes open? If so, how do we calculate those voltages given the tube is on, just to a different cathode?
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