Ghosting on Nixie Tube Clock
I had a very same issue in my design of Nixie clocks. Changing switching time will not help. Try to connect all cathodes to pre-bias voltage of 100V via e.g. 220K rezistors. To get 100V, design a simple voltage divider from driving 180V.
To get more familiar with the issue, please refer to Section &quot;OFF CATHODE CHARACTERISTICS&quot; at http://www.zapro.dk/public/PDF/nixie/N101.pdf which discusses the magic behind.