On 16-08-05 08:51 AM, Nick wrote:
The enclosed Burroughs brochure #616
thanks, a lot of information is one place.
In skimming I noticed a reference to the "characteristic Blue" of the
long life tubes. I guess that confirms the blue spots and the inclusion
of mercury that keeps coming up on
Kr85 has a 10-year half-life, so displays manufactured in the 1980's will
have about 10% of the radioactivity they once had.
I recall reading somewhere that Kr85 was optional in displays; generally
intended for low or zero ambient-lighting conditions. So even if your
display's radioactivity
The Kr85 is a gas in the tube that decomposes by beta decay to supply an
ionization potential to allow the display discharge to start quickly. The
beta particles can't penetrate glass or ceramic of the envelope but when
broken open you can read it with a Geiger counter.
The segment cathode
> Ah I see. That has me wondering what a nixie tube made completely out of
> uranium glass would look like.
It would have a slight greenish-yellow tint, and would fluoresce brightly in
UV. I wonder how much UV a nixie discharge creates.
- John
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I did try matching the XC18s and they did work of sorts. But the slow
realisation came that they didn't work in the dark. I've had no problem
with Z700U trigger tubes wired back to back without matching.
Nick, for your next trick find a few boxes of Z700W dual trigger tubes...
Grahame
On
That's strange, I've built a few circuits from old magazines where the
XC18s were used in just that way and those circuits never failed me. The
only thing I can think of that I did that you might not have done is that I
aged my XC18s so that I knew that they were striking and working within
Whilst wiring two XC-18s together *should* work fine, it doesn't reliably
as they two tubes would need to be perfectly matched, and they never are...
Grahame and I both tried it without too much success...
Not fired up these XC-24s yet...
Nick
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Ah I see. That has me wondering what a nixie tube made completely out of
uranium glass would look like.
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The XC24 have two trigger electrodes, otherwise it's identical to the XC18
- you can wire two XC18s back to back with anodes and cathodes together to
get the same function. I do have these in bulk packing but I've never seen
the box for individual ones, it is really nice!
/Martin
On Friday, 5
That is an incredible find! And the box is amazing! I have never heard of
these. I searched and it went right to Grahame's wonderful trigger tube
clock. So this is a 4 electrode trigger tube. Do tell! That box image is
going to either inspire me or give me nightmares. My guess is both.
-
Try this...
https://en.wikipedia.org/wiki/Krypton-85
You might be surprised at the number of tubes that over the years have had
'radioactive' contents. Many gas discharge devices had it added to regularise
the characteristics for light/dark operation (trigger tubes and regulators) or
their
What does the Kr85 stand for? I see it on one of my displays too.
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