Yeah oxidization is definitely a concern On Sun, May 21, 2023, 7:52 PM Mac Doktor <[email protected]> wrote:
> > On May 21, 2023, at 7:20 PM, Audrey <[email protected]> wrote: > > Isnt that usually only the case with vacuum tubes? I think you're thinking > of thoriated heaters > > > I leave it to someone else to come up with a definitive answer but a neon > sign can start cold because the cathodes are coated with the stuff. I can't > remember precisely what is used but it's more than just thorium. I'm not > sure if they're all elemental but they might be. It's been a very long time. > > Part of precessing a new tube is heating the cathodes to reduce the > oxidized chemicals back to their "raw" state. If a tube needs to be > repaired and the tubing itself can be reused new cathodes will have to be > spliced on and the entire assembly re-processed. > > > Terry Bowman, KA4HJH > "The Mac Doctor" > > https://www.astarcloseup.com > > "I’ve seen things you people wouldn’t believe. Attack ships on fire off > the shoulder of Orion. I watched c-beams glitter in the dark > near Tannhäuser Gate. > > "All those moments will be lost in time like tears in the rain. > > "Time to die"— 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/A79A9EBD-502D-447C-A3A1-46DFB156BE0B%40gmail.com > <https://groups.google.com/d/msgid/neonixie-l/A79A9EBD-502D-447C-A3A1-46DFB156BE0B%40gmail.com?utm_medium=email&utm_source=footer> > . > -- 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/CAPDJQ6C0LwydV7PaMTjC%2BPGKKOOWER1ZA67s7zcc%3D4YrDV185g%40mail.gmail.com.
