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 [email protected] 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 > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7af43fc1-415b-4bea-8f7a-a9396cf57da4n%40googlegroups.com.
