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1. [Amps] filament instant heating query (score: 1): Author: Charles Harpole <k4vud@hotmail.com>; Date: Fri, 15 Jun 2012 03:59:12 +0000; to check on a supposition............ It appears possible that the sudden application of voltage to a tube filament causes degradation of the filament. What seems to happen? Is it possible that the v; /archives//html/Amps/2012-06/msg00127.html (7,858 bytes)
2. Re: [Amps] filament instant heating query (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 15 Jun 2012 00:45:25 -0400; There are others on here who can probably explain this better than I, but... This is typically a problem with filaments that draw a lot of current. At turn on the resistance is a fraction of that onc; /archives//html/Amps/2012-06/msg00131.html (9,521 bytes)
3. Re: [Amps] filament instant heating query (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 15 Jun 2012 00:49:07 -0400; Myth Busters did an experiment with light bulbs to see how they were affected by switching some on and off and others left on. Practically no difference. I believe this mostly started with light bulb; /archives//html/Amps/2012-06/msg00132.html (9,233 bytes)
4. Re: [Amps] filament instant heating query (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 15 Jun 2012 09:11:06 -0400; Amen to that. There seems to be more belief of myths recently in the ham field than before and I suspect a good part is from AG6K's absolute pathetic nomsense that is read by the totally uninformed a; /archives//html/Amps/2012-06/msg00137.html (10,642 bytes)
5. Re: [Amps] filament instant heating query (score: 1): Author: "Jim Hargrave" <w5ifp@gvtc.com>; Date: Fri, 15 Jun 2012 09:27:46 -0500; Well, I'll chime in on this one with personal experience. Regardless of whether you believe in the "Myths" or not. Most are not supported with facts. I have a Clipperton-L purchased new in 1980. It i; /archives//html/Amps/2012-06/msg00139.html (12,194 bytes)
6. [Amps] filament instant heating query (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 15 Jun 2012 07:29:10 -0700; There are others on here who can probably explain this better than I, but... This is typically a problem with filaments that draw a lot of current. At turn on the resistance is a fraction of that onc; /archives//html/Amps/2012-06/msg00140.html (9,317 bytes)
7. Re: [Amps] filament instant heating query (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 15 Jun 2012 12:34:15 -0400; It is the Impedance that controls things Jim. A properly designed transformer will supply its rated voltage AND rated current when its connected to a "matched load" Its no different than a transmitte; /archives//html/Amps/2012-06/msg00148.html (16,945 bytes)
8. Re: [Amps] filament instant heating query (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 15 Jun 2012 13:18:44 -0500; Didn't know that. I always figured the AL-80s were simply over driven so the Ip went way over 400 ma. I have heard of owners having to get a new tube every 3 years or so. What is the stock fil. v.? t; /archives//html/Amps/2012-06/msg00154.html (9,029 bytes)
9. [Amps] filament instant heating query (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 15 Jun 2012 13:12:36 -0600; The mechanical expansion of a cold filament is the function that weakens them. I suppose this means molecular level... Some examples: As Jim Thompson said, thoriated tungsten cold R is much lower tha; /archives//html/Amps/2012-06/msg00157.html (11,513 bytes)
10. Re: [Amps] filament instant heating query (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 15 Jun 2012 16:51:14 -0400; 5.4 to 5.5 on a typical modern AC line. Its hard to get below 500ma even at 70W drive. Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2012-06/msg00159.html (10,095 bytes)
11. Re: [Amps] filament instant heating query (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 15 Jun 2012 16:55:48 -0400; Thats fine John but very few of us are running tubes with 5-7 figures of plate dissipation! Those that do can go to the CB forums for Care and Feeding data! Carl KM1H ________________________________; /archives//html/Amps/2012-06/msg00160.html (12,981 bytes)

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