Big progress: Lab Sample No.3

I experienced big success today. I sealed first really working nixie tube (or nixie retort ;-) . I surprisingly didn’t forget to do any individual step in the making process and ended up with a tube that by far exceeded my expectations.

I tested the tube carefully on the helium leak detector several times, I also checked all the vacuum system, gass filling manifold and gas connectors. I found one small leak on the teflon washer on one of the needle valves (for neon filling) – repaired – and one on the connector to neon bottle – placed a new o-ring. I pumped down all the vacuum system for several hours, gass filling manifold included. I then rinsed both gas branches with gases to get rid of remaining air, closed both needle valves and made a overpressure in those branches so that no air would get in. It turned up that this step was critical for gas purity.

The tube was baked out to 410C (then it broke down, should go to 480C) and then it was filled with neon and argon (5×10-2 torr of argon accorging to thermocouple – very inaccurate value).

Number “0″ is not working as the wire sticking out of the tube broke off :-( Also the stainless steel assembly inside is attacked by something that made it “rust” :-( I don’t know what.. The tube has so strange shape because I didnt have a tubing of so large diameter, so I had to blow it from smaller one..

The most important thing is that I achieved values of striking voltage that are almost like industry made tubes! That is the most important thing for me!

Striking voltage:

1 – 139V

2 – 136V

3 – 141V

4 – 140V

5 – 131V

6 – 149V

7 – 126V

8 – 124V

9 – 136V

Posted on September 9, 2013 at 21:27 by Dalibor · Permalink
In: Progress

9 Responses

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  1. Written by Martin
    on September 9, 2013 at 22:42
    Reply · Permalink

    Absolutely wonderful!

    I really hope that you will try your skills on dekatrons in the future too!

    /Martin

  2. Written by Tomáš Müller
    on September 10, 2013 at 08:12
    Reply · Permalink

    Gratulace! Ted uz “jen” vyladit detaily a muzes je zacit prodavat ve velkem :)

    • Written by Dalibor
      on September 10, 2013 at 17:51
      Reply · Permalink

      jojo, to prijde postupne, na velke serie si netroufam a mozna to ani neni cil ;-)

      Kazdopadne v patek si jedu pro sklo a zacnu delat vzorky s normalnim tvarem, tak ti jeden z prvnich poslu, jak jsem slibil!

      Dalibor

      • Written by Tomáš Müller
        on September 10, 2013 at 22:50
        Reply · Permalink

        Ne zrovna velke serie, ale aby to slo prodavat po sesti + nejake nahradni.
        Jinak hodi se ti jeste ruzne nefunkcni digitrony? Protoze jsem se domlouval s Petem z PVelectronics at mi je kdyztak schovava, protoze to jinak vyhazuje. Az zas od nej neco budu kupovat tak bych nejaky mel mit.

        • Written by Dalibor
          on September 11, 2013 at 07:57
          Reply · Permalink

          Urcite se hodi i spatne, da se z nich v pripade potreby dostat getter apod., nebo pouzit na testovani.. Budu za ne rad!

          Diky, Dalibor

  3. Written by Quad
    on September 26, 2013 at 11:08
    Reply · Permalink

    WOW!!! Amazing. You have a fan in India :)

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