Ah, what a pity. However you now have one that you could open up to get some nice photos of the insides from, like the ones available for the Telefunken XM1000 design here (last photo): http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Nixie/XM1000.htm
/Martin On Sunday, 4 October 2020 14:57:19 UTC+2, jörg wrote: > > Martin, you are right. > I've checked the getter flash and it is gone. Only a white shadow left. > So, sadly, the tube has sucked air and is cracked somewhere at the pins. > Unfortunately, I don't have a plasma ball. > > Dekatron42 schrieb am Sonntag, 4. Oktober 2020 um 01:20:23 UTC+2: > >> Have you got a Plasma ball to hold it to? If air has entered in you might >> see a very faint blueish glow if you turn off the surrounding light. >> >> What does the getter flash look like, like a mirror or is it gone >> completely, or has it gone white? >> >> I have seen a few Nixies where the Anode wire has come lose at a welding >> spot, can you see if something similar has happened to your Nimo with any >> of the wires or the Anode connection - if so you might smack it gently >> against your palm to see if the wire reconnects enough for it to work again? >> >> /Martin >> >> On Saturday, 3 October 2020 23:35:35 UTC+2, jörg wrote: >>> >>> Hi Gregebert, yes, I've checked the tube several times. The cold >>> resistance is about 2,1 ohm, which is identical to the other tubes. >>> Just swapped the tube with a running one on the same driver board. >>> Sadly, no function at all. Under a microscope, no crack is visible. >>> >>> I've made a short video to show the difference between a neon-nixie and >>> a nimo crt-tube and a neodym magnet (very small one.) >>> https://www.youtube.com/watch?v=JJytnrvTy3Q >>> >>> gregebert schrieb am Freitag, 2. Oktober 2020 um 19:25:40 UTC+2: >>> >>>> Jorg - Regarding the dead tube, have you compared the filament >>>> resistance of the bad tube to the others ? >>>> >>>> NIMO tubes have 2 parallel filaments, so if one is open, the resistance >>>> will be TWICE the value of a good tube. >>>> I think the cold resistance is around 3 ohms. >>>> >>>> If 1 filament is out, you can still get 5 numerals to work. >>>> >>>> I would be surprised if both filaments are burned-out, unless someone >>>> put way too much voltage on it, or the tube is cracked around the pins. >>>> >>>> If the filaments are OK, power-up the tube and make sure you get around >>>> 180mA of current. >>>> Then try varying the voltage between the filament and the logic driving >>>> the grids. If a grid is about 6 V more positive than the filament, you >>>> should get a numeral to turn on. >>>> >>>> On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote: >>>> >>>>> Short update of my nimo project. >>>>> I've got 5 tubes running. The sixt is unfortunately DOA. >>>>> The tubes filaments are driven with three power supplies, with soft >>>>> start IC (load switch). >>>>> So the filament gets started very smooth. >>>>> I've made some experiments with multiplexing the tubes. >>>>> Which work nice, using the method described in the manual. The bias >>>>> voltage is changed for every tube, that should be on/off. >>>>> In the actual approch, I'm using direct driving the tubes via 74HC595 >>>>> shift registers. Got a plenty of problems at the beginning. >>>>> The power and signal lines for the 595 were messed with switching >>>>> noise. Some caps did the trick. >>>>> Really nice to view the working tubes. >>>>> >>>>> Video: https://www.youtube.com/watch?v=JbwfZhYhnlo >>>>> >>>>> jörg schrieb am Mittwoch, 15. Juli 2020 um 18:01:18 UTC+2: >>>>> >>>>>> I‘m using Eagle to layout. >>>>>> It takes time for me to feel comfortable with it. >>>>>> And Fusion360. >>>>>> >>>>>> -- 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/133581b0-0d0e-4ecb-b670-181bcae4d127o%40googlegroups.com.
