First, measure the resistance with an ohmmeter. Most likely it's a metal whisker that grew between cathodes; I've seen this happen on multiple IN-1 tubes and I wont use those for any project.
If it's several ohms or more, you can try zapping it like a fuse by applying low voltage across it and slowly increase it till the short blows away. I recall seeing IN-1 "filaments" glowing around 50mA, and zapping after a few hundred mA. On Saturday, June 8, 2024 at 1:26:20 PM UTC-7 Mac Doktor wrote: > I have a GN-4 with an intermittent short between the 0 and 2 cathodes. It > goes away when I tap the tube but it comes right back after a few seconds. > > This is one of six tubes in a Systron-Donner counter. They're orange > coated, no filter in front of them. It's working perfectly otherwise: > > https://www.astarcloseup.com/2022/04/dawe-3001a-frequency-counter.html > > > Is there anything I can do? Does anybody have one on hand? The coating on > them is in great shape. > > > Terry Bowman, KA4HJH > "The Mac Doctor" > > https://www.astarcloseup.com > > "If only you could see what I've seen with your eyes."—Roy Batty, *Blade > Runner* > > -- 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/1e422f90-dd09-456b-a457-c851a4f15af2n%40googlegroups.com.
