Hi Jörg, as I lately got 10 NIMOs in an Ebay auction and am currently also working on a 6 tube NIMO-clock I can sell you a tube from my spares. YouTube NIMO-Clock Update#2 <https://youtu.be/JA1oeqavMg8> YouTube NIMO-Clock Update#1 <https://youtu.be/cGmHSJMAjvk>
Please PM me. Roger jörg schrieb am Sonntag, 4. Oktober 2020 um 15:09:46 UTC+2: > So, if there is someone in the group, who is willing to sell a nimo which > might join the other five, pls. pm me. > > jörg schrieb am Sonntag, 4. Oktober 2020 um 14:57:19 UTC+2: > >> 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/c6b39a10-2315-41b6-9991-9b6b3e936d82n%40googlegroups.com.
