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" <iracosa...@hughes.net>
To: <neonixie-l@googlegroups.com>
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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