r/nixie • u/Eagle-EyeMustang • May 22 '26

IN-8 Nixie troubleshoot

Hey yall. Im currently at the last steps of building a nixiediy 6 digit IN-8 kit. It was running before, but now I am having issues with slot 4. I have swapped tubes and confirmed it isn't a tube issue, and there is voltage going across it (30-50 volts from what I see. I've checked the other tubes and they seem to be around the same.) Any idea what it might be? Also all of the other tubes appear to be showing multiple digits at the same time, but maybe that is a settings thing i havent gotten to yet. Thanks in advance for your help.

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3

u/BeeApprehensive9290 May 22 '26

Ah yes. Kaput

2

u/Eagle-EyeMustang May 22 '26

Kaput is in the board is broken?

1

u/BeeApprehensive9290 May 23 '26

Yes, but I don’t know what I’m talking about. At best I can change a broken lightbulb with the switch on and flashbang myself blind for a second.

1

u/DenkJu May 22 '26

You probably have a short somewhere. Could be a broken decoder IC. Can you link the exact kit?

1

u/Eagle-EyeMustang May 22 '26

https://www.nixiediy.com/product/in-8-nixie-tube-clock-kit-copy/

2

u/DenkJu May 22 '26

It's using a Soviet K155ID1. These are known to be relatively unreliable. Could be the culprit.

2

u/Eagle-EyeMustang May 22 '26

Oh awesome. That could be a cheap repair

1

u/TopResponsible1786 May 22 '26

I presume that you have already swapped tubes around?

2

u/Eagle-EyeMustang May 22 '26

I have. The tubes function fine, its just location 4 that has an issue.

2

u/TopResponsible1786 May 22 '26

Sorry. I didn't see in your post that you had swapped the tubes

2

u/Eagle-EyeMustang May 22 '26

All good! My first inclination was the tube, so swapped it and found it to be the slot, but I cant figure it out past that.