4 Digit Nixie Display prototype is running with the basics without the BCD-10 (4028) and Shift Register (4094) fitted for multiplexing. Running all anodes on for testing.

Unfortunately the previous NPN transistors which I grabbed to drive the bases of the PNP transistors which control the tube anodes were too small. The leakage from emitter to base on the pnp transistors was more than they could handle. Consequently the 4000 series CMOS chips got nuked too =/ I had no throughhole replacements, so I settled on some SMD transistors which I had stashed rated at 400V. No chance of them breaking down. I will also be addding some opto-isolators too...