Hey Jens- The 'bakeout' cycle of processing any glass vacuum device is critical for long life- Every surface, and every material in the bulb has a film of water vapour on it, as well as anything else you left there with your fingers. The water has terrible effects on any filament, and even a very minute amount will ruin a bulb. Water vapour is also liberated from the glass itself during heating, and during 'tip-off', when you make your final seal... Getters will solve this problem, but only to a certain extent.
You'll notice in the video that both of the induction treatments are very particular in their location- If you heat the feed-through wires, either with the induction, or by heating what they are attached to, they will crack the glass and ruin your vacuum. The induction must be focused only to parts that can withstand heat. Notice also, that an induction heating is required even after the bakeout- Any nixies will eventually need to go through all of this to have long lives. You sound like you're just about ready to light things up! Very exciting! ( I've been a scientific glassblower for 21 years, by the way...) -Dylan On Jan 17, 12:55 am, jb-electronics <webmas...@jb-electronics.de> wrote: > Hi John, > > thanks for your links, they all look interesting. > > Another idea for the inductive heater: There are so many inductive hot > plates around that work exactly this way. Couldn't I use one of these? > > Jens -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
