So you got a few 50-packs of Nixies from Russia. How do you test them?

With this manual Nixie tester.

It operates from any power supply 7.5 - 16VDC. The button is to test the dot segment.

To build this, you will need:

• Wall-wart 7.5 - 16VDC out, maybe 20mA minimum
• BCD pushwheel (such as Omron A7D-106-1)
• Pushbutton (normally open)
• K155ID1 or 74141 IC
• 16-pin ZIF or DIP socket (recommended, for the K155ID1 in case yours is a dud and you need to replace it)
• IN12-A/B socket (you can 3D print one)
• 7805T 5v linear voltage regulator
• 12x 1-mm pins scavenged from a D-sub connector, for the 3D-printed socket
• 5x 680-ohm resistors
• 1x 25k resistor (value not important, +/- 5k is fine)
• NK01A HV power supply kit (it's a compact DC-DC converter for tubes)

I would just build this on a perfboard, it's not really worth making a PCB.

WARNING! The output from the NK01A is lethal. That is, it can source an energy of over 13.5 W-sec over three seconds. Be very careful:

• When working with the power on, always keep one hand well away from the circuit.
• When working with the power off, make sure the power is unplugged, use one hand to short the supply's output to ground (to discharge any capacitors). Then measure the output of the supply with a meter to be sure it's dead.
• An enclosure is recommended so you can handle the entire thing safely with the power on.