Nixie UNIVERSAL TUBE CLOCK KIT Assembly Instructions And User's Manual page 32

12.1.3. Due to the thickness of the wire, it will be difficult to connect it to the controller. So, solder a
single-wire to each connection. Use heat shrink tubing to isolate the joints.
12.1.4. Cut the desired number of female pins and solder them to the cable. Check the tube datasheet
to identify cathode numbering.
12.1.5. Nixie tubes can be soldered directly to the wires or sockets can be used. It is more convenient
to use the sockets, as in case the tube fails, it will be easier to replace it.
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