I'm a beginner of electronics. I have several IN-12A nixie tubes. I want to mount the nixie tube on the PCB. However, the position of the pin in the datasheet is out of the position of the pin in the nixie tube. enter image description here

Also, since the pins are slightly twisted with each other, adjusting the library to one nixie tube can cause problems when replacing nixie tubes. How do I arrange holes to design a library that fits all IN-12A Nixie tubes?(I use the pins of D'SUB instead of Nixie Socket.)


PCBs and tubes don't mix well for that very reason the pin tolerances of tubes are too high and bending pins of a tube isn't an option either.

So the answer is to use a proper tube socket. These are made for that purpose, their individual contacts wiggle inside the socket housing to account for the manufacturing tolerances of the tube.

  • \$\begingroup\$ I live in the Republic of Korea and it takes too long to buy tube sockets. Is there any way to adjust PCB holes? \$\endgroup\$ – Ho jun Dec 28 '17 at 8:10
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    \$\begingroup\$ No. Each tube is unique in how the pins are slightly off. And don't even think about making the holes in the PCB bigger and use solder to fill up the gap. This would break the solder and/or the tube as the tube heats up and gets colder a number of times. If you can't have a tube socket, you have to solder stranded wire to the pins so there is a way for the mechanical forces to relieve. Don't laugh about that, it was a common practice in many small devices. \$\endgroup\$ – Janka Dec 28 '17 at 8:15
  • \$\begingroup\$ Is there no way to use D'SUB at all? \$\endgroup\$ – Ho jun Dec 28 '17 at 8:23
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    \$\begingroup\$ You can use the individual DSUB contacts if you put them into a housing where they can wiggle in. Again, use a stranded wire to connect the contacts with the board. \$\endgroup\$ – Janka Dec 28 '17 at 8:28
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    \$\begingroup\$ Make the hole bigger to accommodate for tolerance. If the pins are let's say tilted towards center, make an elongated hole rather than a circular one. Make sure all holes are radially aligned towards center. \$\endgroup\$ – Whiskeyjack Dec 28 '17 at 9:05

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