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1. [Amps] Outgassing tubes. (score: 1): Author: <exray@bellsouth.net>; Date: Sat, 1 Oct 2005 09:36:16 -0400; Wiil, For years it was and is common practice to outgas tubes by applying HV at low current i.e. one or two ma. till the tube arcs. Then reduce the HV a tad till the tube stops arcing. Leave the HV a; /archives//html/Amps/2005-10/msg00007.html (6,527 bytes)
2. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sat, 01 Oct 2005 13:23:34 -0400; George, Yup, I have heard some call this gettering too which really isn't the correct term per say, but understand what they're trying to do. I always called it "burning them in", but it's the same t; /archives//html/Amps/2005-10/msg00013.html (8,678 bytes)
3. Re: [Amps] Outgassing tubes. (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 1 Oct 2005 17:17:53 -0700; I have never heard this one. If this procedure works as advertised, why do manufacturers build an ion pump into large electron tubes? Running a 3-500ZG as hot as possible will cause the carbon (graph; /archives//html/Amps/2005-10/msg00024.html (8,181 bytes)
4. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 02 Oct 2005 14:57:07 -0400; George, Your correct. The tubes though that do intermittantly spit or arc I've noticed folks are running them right at the maximum or over the maximum rated plate voltage. Tubes aren't evacuated 100%; /archives//html/Amps/2005-10/msg00048.html (12,103 bytes)
5. Re: [Amps] Outgassing tubes. (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 2 Oct 2005 23:16:17 +0100; We should be careful to think of these as two totally different kinds of "gassy tube" problems. The releases of gas from structural materials are big enough to cause an arc when they happen, but are; /archives//html/Amps/2005-10/msg00064.html (8,579 bytes)
6. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 02 Oct 2005 18:28:59 -0400; Ian, Your correct about the differences! I've seen the innards of several types of transmitting tubes though and never seen a true getter like the ones used in receiving tubes. Where are they in them; /archives//html/Amps/2005-10/msg00067.html (9,722 bytes)
7. Re: [Amps] Outgassing tubes. (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 3 Oct 2005 00:02:19 +0100; The basic principle of a getter is to form a chemical bond with stray gas molecules. This is a two-way process because the chemical bonds are often quite weak, so trapped molecules can also be releas; /archives//html/Amps/2005-10/msg00070.html (10,088 bytes)
8. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 02 Oct 2005 19:25:52 -0400; Ian, Thanks as I didn't understand what you meant. I take it when this coating is heated, it traps the gas molocules by the reaction. Receiving tube getters absorbs the gas during the flash from a ch; /archives//html/Amps/2005-10/msg00071.html (12,153 bytes)
9. Re: [Amps] Outgassing tubes. (score: 1): Author: "Jim Reid" <reidj021@hawaii.rr.com>; Date: Sun, 2 Oct 2005 13:31:40 -1000; Will wrote, in part: Perhaps that is what happened to my little AL-811H. My tubes were "only" about 10 or 11 years old, however. They were used very little over that time; maybe they gassed up slowly; /archives//html/Amps/2005-10/msg00072.html (8,908 bytes)
10. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 02 Oct 2005 20:07:31 -0400; Jim, Tubes sure have a shelf life or I always thought they did. The seals to keep air out of the vacuum, I think, can leak even though a very miunute amount. Over time though, this keeps building. Th; /archives//html/Amps/2005-10/msg00073.html (11,009 bytes)
11. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 02 Oct 2005 20:10:31 -0400; Jim, I should have added that those arcs, even though one might think minor, put's a quick surge to any power supply of several amps current similar to taking the B+ lead and quickly shorting it to g; /archives//html/Amps/2005-10/msg00074.html (10,221 bytes)
12. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 02 Oct 2005 21:18:20 -0400; Bill, Your correct. That's a similar thing to what is done in cleaning or rejuvenating a CRT. The arc burns this stuff off and restores it's function. I've saved a many a CRT using a rejuvenator. Any; /archives//html/Amps/2005-10/msg00078.html (13,387 bytes)
13. Re: [Amps] Outgassing tubes. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Sun, 02 Oct 2005 21:10:25 -0400; I have been on vacation and just got back and saw this thread starting with"Question". OK, you apply HV to a tube and it arcs a couple of times and then it is OK. Does that mean that you have remove; /archives//html/Amps/2005-10/msg00079.html (12,300 bytes)
14. Re: [Amps] Outgassing tubes. (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 3 Oct 2005 07:30:39 +0100; While the barium metal getter is being deposited onto the glass (after the tube has been sealed), some of the remaining gas molecules are buried under the metal. In addition the process leaves a chem; /archives//html/Amps/2005-10/msg00082.html (10,100 bytes)
15. Re: [Amps] Outgassing tubes. (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 3 Oct 2005 08:21:09 +0100; The whole process of "conditioning" includes both removing any small internal spikes *and* giving the getter a chance to do its work. Surface spikes provide the high potential gradient, but a poor va; /archives//html/Amps/2005-10/msg00083.html (11,844 bytes)
16. Re: [Amps] Outgassing tubes. (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Mon, 03 Oct 2005 08:00:26 -0400; See below, ** REPLY SEPARATOR ** In B/W and color CRTs this actually does happen but to be honest, it's been so long I forget the process that causes it. If I can run across my books on it, I'll look; /archives//html/Amps/2005-10/msg00085.html (15,141 bytes)
17. Re: [Amps] Outgassing tubes. (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 5 Oct 2005 08:45:54 +0100; Trying to wrap this up... Contrary to what I'd said previously, apparently microscopic surface spikes or "whiskers" *can* re-grow on some metals in a vacuum. This can affect NOS and long-stored vacuu; /archives//html/Amps/2005-10/msg00125.html (11,532 bytes)
18. Re: [Amps] Outgassing tubes. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 5 Oct 2005 16:15:59 +0200 (CEST); arc when they happen, but are often small enough to be removed by the chemical gettering action (which is built into most transmitting tubes even if you don't know it).> The tantalum anode (as used i; /archives//html/Amps/2005-10/msg00130.html (7,313 bytes)

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