And again there is closing a CRT rebuilding plant. This time in France. A
bit too far from my home.
See the mail I received from Giorgio. No TCA members in the direct
environment...
Anyhow, they would have cathodes.
eric
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Instrument Resources of America
Sent: dinsdag 29 april 2014 5:21
To: [email protected]
Subject: Re: [neonixie-l] Neon size limitations?
Hello John,
I do not know all of the in's and out's of it. But I do recall that a
group of early television collectors had tried in vain to preserve several
of the original 15 inch color television CRT's by rebuilding them, with the
help of a CRT rebuilder, who by the way is now long gone.
Not dead, I don't think, just forced into retirement by lack of rebuilding
business, or perhaps even willingly. His equipment for
rebuilding is now in the hands of "The Early Television Foundation"
http://www.earlytelevision.org/ and,
http://www.earlytelevision.org/crt_project.html and,
http://www.earlytelevision.org/15GP22_rebuild_report.html If you
read down through the article in this last link, to the point where you are
at the second sentence, before the heading of ""The Way Forward""
you will read the following sentence,,,,""Then the cathodes are activated by
heating them using elevated voltage applied to the
filaments."""". All of those particular CRT's had gone to air, and it
was a requirement for rebuilding them, that new guns be installed since the
old guns cathodes were all of no use. Some how or other the cathodes of the
guns are indeed activated after assembly, sealing, and evacuation. After
that exposure to air renders them useless. There is a lot of interesting
reading on these pages and tons of photos, plus even
more links. Ira.
On 4/28/2014 7:07 PM, JohnK wrote:
> I was about to reply the same.... then I started to think about what I
> could actually quote.
>
> This implies that a cathode gets activated after assemby and
> after/during pumping.
> What is the chemical during construction?
> What is the chemical during operation?
> What is the chemical after later exposure to air?
> If the chemical after later exposure to air is not the same as that
> during construction, can this later chemical be converted to what is
> required?
>
> I thought I knew this :-(
> I have just reached down Materials and Techniques for Electron Tubes
> [revised edition of Materials Technology for Electron Tubes], Walter H
> Kohl, 1960,Reinhold.
>
> John K.
>
>
> ----- Original Message ----- From: "Instrument Resources of America"
> <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, April 29, 2014 9:11 AM
> Subject: Re: [neonixie-l] Neon size limitations?
>
>
>> Also!!! It is my understanding from being a member of T.C.A. Tube
>> Collectors Association, another Yahoo group, that once the 'cathode'
>> of the gun is exposed to 'air' it is DESTROYED, and can NOT be used
>> again. Ira.
>>
>>
>>
>> On 4/28/2014 4:18 PM, NeonJohn wrote:
>>>
>>> On 04/28/2014 04:47 PM, Matthew Smith wrote:
>>>> Quoth Tidak Ada at 2014-04-29 06:13 ...
>>>>> I once opened a 50 cm B/W picture tube to make a lamp of it. I
>>>>> carefully packed the tube in thick blankets and then filed off the
>>>>> exhaust nipple.
>>>>> About one minute of hissing and the pressure was equilibrated. No
>>>>> danger at all!
>>>> Aha! I wanted to get the electron gun and base of a CRT, to
>>>> re-mount into a longer accelerator structure - was wondering how to
>>>> break the vacuum safely.
>>> That works but it pretty much destroys the evacuation port for
>>> future use. I have the same intentions and have collected several B/W
guns.
>>> My technique is to use a dental turbine (a dremel will do) and bore
>>> an about half mm hole through the neck downstream of where I plan on
>>> cutting it. That way I can re-open the tubulation in a controlled
>>> manner and reuse it.
>>>
>>> John
>>>
>>>
>>
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--- Begin Message ---
Hi Eric,
I've been contacted by someone of the Société RACS, located in
Saint-Christol-les-Alès (France), because they cease their activity, asking
if I could be interested in some pieces or equipments for my collection.
Not really a CRT manufacturer, although they have built some custom-made
tubes in the past, their main activity was the rebuilding of CRT's, and you
can see nice pictures of their factory here:
http://s281.photobucket.com/user/jhalphen/library/CRT%20Rebuilding%20at%20RA
CS%20France?sort=9
<http://s281.photobucket.com/user/jhalphen/library/CRT%20Rebuilding%20at%20R
ACS%20France?sort=9&page=0> &page=0
The generalization of flat planel screens sounded the death knell of their
activities.
Unfortunately, they are located much too far from here...
Cheers,
Giorgio
--- End Message ---
