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

Tue, 26 Jun 2012 14:44:51 -0700 

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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