Unlikely. I have fourteen IN-18's in my kitchen clock, and none has failed. 
These are extraordinary tubes that look great and last a long time.

On Wednesday, June 15, 2022 at 8:05:09 AM UTC-7 lawill...@gmail.com wrote:

> Thank you to everyone that responded with the answer. Never would have 
> guessed this. To follow up; is it common for the capsule and wire to come 
> loose and float inside the tube? Depending on where the wire rests it 
> shorts digits together.
>
> On Wednesday, June 15, 2022 at 10:43:59 AM UTC-4 Paul Andrews wrote:
>
>> It is a capsule that contained mercury. It was heated up when the tube 
>> was manufactured to release the mercury. The addition of mercury to the 
>> tubes vastly extends their lifetime.
>>
>> On Tuesday, June 14, 2022 at 10:15:13 PM UTC-4 lawill...@gmail.com wrote:
>>
>>> I recently got some IN-18 nixies and noticed an internal coil/wire 
>>> between pins 1 and 8. What is it? 
>>> In one of my tubes the wire has come disconnected and loose inside the 
>>> tube shorting digits together.
>>> Thanks
>>>
>>

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