Re: [neonixie-l] Re: nixie makers: getters

jb-electronics Tue, 26 Jun 2012 15:44:26 -0700

Hi Dailbor,

you mention a key point: I tried a setup with ordinary refrigerationtech hoses before (just like the ones on your website) and I also usedtransparent silicone hoses. The result was: It was not tight. There wereleaks all over the place.

That is why I want to get rid of this problem by using modern flangesystems. It is a bit expensive, but it is money I only have to spendonce. It saves (me) a lot of time and grief, but of course, everybodyhas to find his or her own way. There are many ways of more or lesssuccessful Nixie tube making :-)


Jens

Making a glass vacuum system (filling manifold) is quite easy withglassblowing torch and blowhose. I tried several T-joints and when Iwas satisfied with function (look could be better) I started to make aglass system. I am not decided how to connect it to vacuum pump, Irealised, that silicone hoses (I use) outgasses to much..

Vermiculite is curious material, it is very light, it has almost nothermal capacity, it is good thermal insulant, so the cooling is veryslow. The heat from the annealed glass is enough.


Dalibor

2012/6/26 jb-electronics <webmas...@jb-electronics.de<mailto:webmas...@jb-electronics.de>>


    Hi,

    for easier maintenance and also due to my dissatisfactory
    glassworking skills I will use a standard vacuum flange system.
    There is a very good needle valve I used once in the university
    that I would love to have for my setup. It allows you to let in
    the gas very (!) smoothly so almost any pressure can be achieved
    given the vacuum system is not leaky. The bad part is that this
    valve costs 200 EUR, which is much for a student (if you have to
    pay rent and stuff...). But it is a one-time investment that will
    definetely pay off.

    Interesting about the vermiculite, I did not know it was
    sufficient to just put the glass in there, I thought some kind of
    active tempering was still required.

    Jens

    Hi, for what do You need needle valve? And how much does that
    costs? I use common glass high vacuum valves..

    I am going to build an oven according to:
    
http://www.teralab.co.uk/Glass_Blowing/Annealing_Oven/Annealing_Oven_Page1.htm

    Now I use a box with vermiculite ($10), it works surprisingly
    well, if You are patient enough to wait until it really cools
    down, nice result may be obtained. But the real annealing is
    still better. Look here: http://www.randombytes.org/lamps_old.html

    Dalibor

    2012/6/26 jb-electronics <webmas...@jb-electronics.de
    <mailto:webmas...@jb-electronics.de>>

        Hi Dalibor,

        yes, that is my number 2 item on the wish list, the first one
        is the needle valve.

        What do you do for annealing? Have you built yourself an
        annealing oven?

        Jens

        I forgot, I bought small glassblowing torch, oxy-gas, it is
        huge difference compared to hardware torch. If You have some
        spare money, go for it.. You can set the flame to heat just
        a small area (5mm diameter) and so...

        Dalibor

        2012/6/26 jb-electronics <webmas...@jb-electronics.de
        <mailto:webmas...@jb-electronics.de>>

            Hi,

            Do You have any info about your progress on your site?


            I am currently training my glasswork "skills", which is
            really a lot of work, so this eats up all my spare time
            at the moment. I will have more time in the next months,
            so for me it will take some more time, sadly. Hence,
            there is nothing to report for my website as of now :-(

            I have a plan, though, for a simple glow lamp with two
            cathodes that I will be able to build with my primitive
            tools and especially primitive burners. Let's see :-)

            Jens


            Dalibor

            2012/6/26 jb-electronics <webmas...@jb-electronics.de
            <mailto:webmas...@jb-electronics.de>>

                Hi folks,

                the only tube with a flashed getter I know of is
                the XN-1:
                http://www.tube-tester.com/sites/nixie/data/XN1/XN1.htm

                To be honest: I will not use getters at the moment.
                There is so much glasswork to figure out for me,
                that is the part that I will focus on in the next
                months. :-)

                Jens

                Hi Dylan,

                flashed getters are not used in nixies (I havent
                seen it at least), just some VFD tube use flashed
                getters. Flashed getters leave a coating on a
                glass envelope of the tube - we don't want that. I
                think that kind of getter needs only initial
                activation by heat which could be done by
                induction heating as well as in the case of
                flashed getters. Look to IN-14 nixie, there is
                exactly the same pellet.

                The only matter to solve will be attaching the
                pellet to a wire, but I think that will be
                possible to do by spot welding - inspired by IN-14.

                Thanks,

                Dalibor

                2012/6/26 dylan roelofs <doktorb...@gmail.com
                <mailto:doktorb...@gmail.com>>

                    Hey Dalibor and others-
                       I don't feel that these are the right
                    getters for nixie tubes.
                       The literature lists them as thermally
                    active- they only absorb if you put them
                    somewhere hot.
                       Many styles of getters are made this way;
                    most tubes do run quite hot, beacuse of the
                    filaments..

                       There isn't anywhere in a nixie tube that
                    is constantly 100C-200C. (That's part of the
                    magic of nixies, of course)

                       You really want some flashed barium
                    getters; they absorb gasses at any temperature.

                       -Dylan
                    www.dylankehderoelofs.com
                    <http://www.dylankehderoelofs.com>




                    On Monday, June 25, 2012 11:21:36 AM UTC-7,
                    Dalibor wrote:

                        Hello guys,

                        I've got an offer on getters, tech info
                        attached.. the price is approx. 5pcs/1
                        eur. Is anyone interested in it? I will
                        place an order in several weeks, I may
                        send some pieces sealed in argon filled tube..

--Dalibor Farny

                        http://dalibor.farny.cz

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Re: [neonixie-l] Re: nixie makers: getters

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