On Wednesday, June 25, 2014 9:48:29 AM UTC-7, Jonathan wrote:
I guess i don't know why cathode poisoning is such a big deal. If the
digits i don't use don't work, what do I care?
I guess I agree with you. With wired-in tubes you don't have the option to
rotate them anyway, and it's highly
I just rotated the 15 tubes in my big clock after 11 months. They display
the same numeral 24/7, which I believe is the worst-case scenario for
cathode poisoning.
12 tubes showed no signs of degradation
3 tubes showed slight degradation:
- A slightly dim tube is now fine after running 12
Hi guys,
is there anyone here having a tube with cathode poisoning that is so
severe that cant be healed? It should be a bare metal depositing on
the cathodes, so I am very confused why it cannot be healed? What kind
of tube it is?
I am now making a small research on aging new tubes just after
I have a few Burroughs 5031 tubes that appear to be poisoned on some
digits, and have not responded to attempts to restore them with
higher-than-normal current.
The glass is darkened on the inside, which I assume is deposited metal.
Cathodes are still visible.
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I have a couple of Z566 tubes that appear to be badly poisoned...partial
illumination on some digits and noticeable flickering on some
others..haven't got around to burning them off yet...Also a few IN-18's
tubes with bad cathode poisoning too...
It happens..
On Thu, Jun 26, 2014 at 2:34 PM,
I'm curious as well.
I could see issues with the 10's position for seconds and minutes, as
the highest number it will ever see is 5. Is that an issue if you don't
care about the other numbers? 10's of hours will only see a 1 for a
12-hour clock, and up to 2 for a 24-hour clock. Do we
If your tubes are socketed, you can rotate them yearly. It's a bit of a
pain if you have several clocks (grrr...I have 5 clocks, and one of them
has 15 tubes)
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