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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+filament\s+supply\s+D\.C\s+or\s+A\.C\s*$/: 6 ]

Total 6 documents matching your query.

1. [Amps] filament supply D.C or A.C (score: 1): Author: eran <erniaba@netvision.net.il>; Date: Wed, 13 Feb 2008 14:11:51 +0200; Looking for reliable information regarding filament supply to amplifier tubes. What are the pros and cons for D.C or A.C volts. Thanks and 73s Eran 4X1MO No virus found in this outgoing message. Chec; /archives//html/Amps/2008-02/msg00075.html (6,973 bytes)
2. Re: [Amps] filament supply D.C or A.C (score: 1): Author: <d.cutter@ntlworld.com>; Date: Wed, 13 Feb 2008 13:08:37 +0000; This might give you a clue, but not the full answer: a lamp manufacturer published a treatise on this subject and concluded that ac was better for life expectancy. Something to do with migration of e; /archives//html/Amps/2008-02/msg00077.html (8,606 bytes)
3. Re: [Amps] filament supply D.C or A.C (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Wed, 13 Feb 2008 05:34:58 -0800; I remember reading the same test about the ac on filaments. I recall the test was run because the lamp manufacturer specified a long life bulb and an aircraft manufacturer installed them and found su; /archives//html/Amps/2008-02/msg00078.html (8,643 bytes)
4. Re: [Amps] filament supply D.C or A.C (score: 1): Author: "Patrick Egloff" <pegloff@gmail.com>; Date: Wed, 13 Feb 2008 14:42:29 +0100; -- Some say that if you run the tube on dc, you should alternate the polarity of the filament every so often, to offset the migration problem. -- About 60 times a second would be great !! ;-)) -- Pat; /archives//html/Amps/2008-02/msg00079.html (9,378 bytes)
5. Re: [Amps] filament supply D.C or A.C (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 13 Feb 2008 09:01:10 -0500; When in doubt ask the manufacturer. Transmitting tube filaments come in thoriated tungsten and oxide coated; trying to compare all against a panel lamp is rather ridiculous. I can see the benefit of; /archives//html/Amps/2008-02/msg00080.html (9,768 bytes)
6. [Amps] filament supply D.C or A.C (score: 1): Author: "Robert Chudek - K0RC" <k0rc@pclink.com>; Date: Wed, 13 Feb 2008 13:46:07 -0600; иииииииииииииииииииииииииии Wouldn't 100 or 120 times a second be more readily available? 73 de Bob - KиRC in MN иииииииииииииииииииииииииии -- Message: 11 Date: Wed, 13 Feb 2008 14:42:29 +0100 From:; /archives//html/Amps/2008-02/msg00085.html (9,451 bytes)

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