Hi,
here are the pictures of one of the colon tubes (as always, air at 15mbar):
http://www.jb-electronics.de/tmp/gl-ls-8_1.jpg
http://www.jb-electronics.de/tmp/gl-ls-8_2.jpg
Sadly, the upper dot does not always light up. It was a silly idea to
parallel the two cathodes, next time I will have the two dots wired
seperately.
Jens
Hi again,
here is a picture of my "lab" / desk. I do not have a separate room
for my tube making, so I have to clean off the desk every time I need
to work for the university. It does not take much time, and so it is
actually an advantage because it forces me to keep my lab tidy.
http://www.jb-electronics.de/tmp/lab.jpg
See the t-connector? This will be replaced by a connector with an
additional outlet (so 4 in total) for my needle valve.
I have been trying to build two colon tubes today, with some minor
success. Will post pictures tomorrow.
Jens
Hello!
By the way, how do You measure the pressure in the system? You
mentioned the glow lamp is filled on 15mBar...
Could You send a photo of the system You use for pumping and filling
the glow lamps?
The capacitor welder You have will work well, it is not suitable for
welding materials with high melting temperature like tungsten and
molybdenum, but for steel, nickel and so it is very good!
> The problem with stainless steel wire is that it outgasses; I have
a glow lamp with two stainless steel electrodes and it glows in a
white-ish blue color, very strange. Will post a picture later this
weekend if I don't forget.
the bluish color is not outgassing, outgassing is when the metal
releives trapped air, oxygen, CO2, moisture and so into vacuum, You
can avoid that by heating the wire into red for a minute or so just
before sealing and pumping.. Each metal behaves differently in
discharge - different voltages and so, so it could be because of that..
Dalibor
Dne 19.10.2012 7:29, jb-electronics napsal(a):
Hi guys,
thanks for your advice. I think the problem is the one Dalibor
pointed out: with Dumet wire the sputtering is very high. Also,
since I am using no noble gas (except for the less than 1 percent
there is in ambient air), the cathodes are having a much harder time
anyway. So for now I will not install these tubes in a permanent
circuit since they would only last for a few hours.
I will wait for my needle valve (will be here any day now) and try
with Neon (and some day with Argon, too, of course). The ignition
voltage should be drastically lower, and the visibility should
increase.
The problem with stainless steel wire is that it outgasses; I have a
glow lamp with two stainless steel electrodes and it glows in a
white-ish blue color, very strange. Will post a picture later this
weekend if I don't forget.
Ah, by the way, I already have a small capacitor-based spot welder,
and so far, for my purposes, it has served me well:
http://www.robbe.de/welma-2000-punktschweissgeraet.html?___store=en
Jens
Keep up the good work !
If you need have some DXF files (vector format) on the digits you
want, or a image of the whole set, in a raster format, throw in my
direction. I'm in good with a guy that owns a steel cutting laser.
4000W of CO2 goodness. He'll run small jobs for me for nothing, as
long as I don't abuse it. That means pester him for work too often.
I still want that "1 - 12" "tri-quad" tube. 3 anodes x 4 cathode
sets (of 3).
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