Hello. I was wrong on the leak direction, indeed. I did further experiments with the couple of tubes that react to the neon tester (HVAC source applied to one pin, and holding the tube with the other hand).
I could pile up power supplies to just below 700V and digits still don't light fully. Given its small surface, the decimal point always works. The voltage drop in the tube is between 350 and 390V depending on the current. At 9mA it gets warm to the touch. Pleasantly warm, could be 35°C (+15°C from room T). Then I tried again 630V @ >=4mA and it is still possible to get a glow with the 350V drop. The nice thing is that the glow constantly moves up and down the digit, therefore with a proper power supply it could be used in some art display. Colour changes with current. It has been a nice practical learning experience. Paolo On Wed, Dec 9, 2020 at 11:18 PM Christian Riise Wagner < [email protected]> wrote: > That's pretty cool that it somewhat lights up. However I think that you're > mistaken in your assumption that the neon has escaped, leaving only argon > in there. The gas mixture in a Nixie tube is at a very low pressure, so my > guess is that atmospheric air has leaked into the tube, thus increasing the > pressure inside. This would also explain why the voltage needs to be that > high. And ionized atmospheric air does indeed light up purple. > onsdag den 9. december 2020 kl. 21.38.54 UTC+1 skrev Paolo Cravero: > >> Hello. >> As I said in the IV-6 thread, I bought some apparently dead IN-16 that >> react to a Neon tester (HVAC) with a violet/lavender glow. >> >> Since there is gas, it will light up one way or another! >> >> This is the promising result with 632 Vdc at about 9 mA: >> https://youtu.be/NfKj6_Kf8DE (color does not match reality). >> >> To me it looks like a normal Nixie at undervoltage conditions. I can >> probably add some other 100V using battery powered DC-DC boosters. >> >> Paolo >> >> -- > 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/ab0b0886-f950-4eea-bd37-f7839e3e31ben%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/ab0b0886-f950-4eea-bd37-f7839e3e31ben%40googlegroups.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/CABj2VaZV5VpkkPSs0L1eMREM4jzSsZXmjPTZo1Wz2%2BmiJc6_Sw%40mail.gmail.com.
