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1. [Amps] Tube wear out phenomena (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 20 Dec 2015 23:17:49 -0700; Thorium is added at the 1% level to pure tungsten, to improve efficiency of electron emission from the filament of direct heated tubes. It allows a reduction of the temperature of a filament and redu; /archives//html/Amps/2015-12/msg00041.html (11,855 bytes)
2. [Amps] Tube wear out phenomena (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 22 Dec 2015 07:04:48 -0800; Thorium is added at the 1% level to pure tungsten, to improve efficiency of electron emission from the filament of direct heated tubes. It allows a reduction of the temperature of a filament and redu; /archives//html/Amps/2015-12/msg00049.html (13,224 bytes)
3. Re: [Amps] Tube wear out phenomena (score: 1): Author: RMorris <robrk@nidhog.net>; Date: Tue, 22 Dec 2015 10:01:21 -0500; Some winter reading.... http://www.w8ji.com/qst_the_care_and_feeding_of_a_3-500zg_filament.htm Sent from my iPad _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2015-12/msg00053.html (11,838 bytes)
4. [Amps] Tube wear out phenomena (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 25 Dec 2015 15:40:01 -0700; I read the link below; my comments come from discussions with the direct tube engineers and application engineers with RCA, Eimac. E2V, and Thales (Thomson). I was at Thales factory for a week last m; /archives//html/Amps/2015-12/msg00060.html (9,697 bytes)

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