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261. [AMPS] Delrin Spreaders (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 20 Jun 1997 14:58:00 +0000; But facts indicate they can be. I use such a system on 80, 40 and 30 meters. The Hygain hytower used some parallel elements in combination with stubs, as do many commercial antennas. TV antennas do; /archives//html/Amps/1997-06/msg00314.html (8,348 bytes)
262. [AMPS] neutralising (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 20 Jun 1997 14:58:00 +0000; To: <amps@contesting.com> Right Pete. Phase shifts with tuning, Unless there is some way to guarantee the user ALWAYS sets the tank and input circuits to the same resonant point where feedback was o; /archives//html/Amps/1997-06/msg00315.html (8,373 bytes)
263. [AMPS] Delrin Spreaders (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 20 Jun 1997 21:02:00 +0000; The issue is voltage gradient per unit volume and dissipation factor. If the voltage is not evenly distributed in the insulator we need to know the distribution also. "The change is phenomenal, but; /archives//html/Amps/1997-06/msg00318.html (9,468 bytes)
264. [AMPS] Re: dimmers (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 22 Jun 1997 18:04:21 +0000; To: <amps@contesting.com> Hi Bill, I do have more failures (when the bulbs are identical wattage) with switches that are flipped off an on less frequently. I do have a dimmer that goes through bulbs; /archives//html/Amps/1997-06/msg00337.html (9,320 bytes)
265. [AMPS] Delrin Spreaders, a test (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 23 Jun 1997 08:01:42 +0000; That's about 8 kW if the line is matched, but of course none of that gives us any idea what voltage the delrin or nylon failed at. Someone suggested a microwave, but again we would have no idea how t; /archives//html/Amps/1997-06/msg00340.html (10,893 bytes)
266. [AMPS] Delrin Spreaders, a test (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 23 Jun 1997 15:08:30 +0000; To: <amps@contesting.com> I see. My test today was with 50 watts. 50 watts can generate many kV, so the problem is one of voltage and not power. That is my point. You're correct. I thought RG-9 was; /archives//html/Amps/1997-06/msg00343.html (9,021 bytes)
267. [AMPS] Teflon, delrin etc. (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 23 Jun 1997 21:03:10 +0000; Hi Ron, I agree with that also, as a general rule for determining losses. But remember the microwave does not put voltage stress on the part, or UV light, or other real world things that are importan; /archives//html/Amps/1997-06/msg00345.html (8,787 bytes)
268. [AMPS] Recycling filament (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 26 Jun 1997 11:38:28 +0000; I have to agree with Peter, I can't imagine a 723 being a "good choice" for an IC near strong RF fields. I seriously question the carte blanche statements about bypassing ("do this, it always works"); /archives//html/Amps/1997-06/msg00356.html (8,170 bytes)
269. [AMPS] Recycling filament (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 27 Jun 1997 08:36:33 +0000; I've had bad luck with 723's unless they are in a well shielded area and everything is bypassed quite well. The shielding and layout is probably more important than the specific value of bypass comp; /archives//html/Amps/1997-06/msg00362.html (10,097 bytes)
270. [AMPS] Recycling filament (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 27 Jun 1997 09:59:01 +0000; Hi Bill, While this is something I rarely consider, I'm not aware of the temperature having a different slopes for increase and decrease anywhere on the curve, unless the filament were removed and r; /archives//html/Amps/1997-06/msg00365.html (8,946 bytes)
271. [AMPS] Ameritron Al-811H (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 7 May 1997 09:55:11 +0000; Hi Mike, Parasitics do not cause filaments to break in a tube. Those claims are silly. Filament breakage is due to mechanical shock or weak mechanical points in the filament. The original 811A Chine; /archives//html/Amps/1997-05/msg00042.html (8,454 bytes)
272. [AMPS] Parasitics and Blown Filaments (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 8 May 1997 08:34:46 +0000; Hi Carl, You must have misread my comments. Parasitics are not a cause of blown filaments, but mechanical construction sure is...as is mechanical shock. My opinion is people who blame all these ampli; /archives//html/Amps/1997-05/msg00049.html (9,840 bytes)
273. [AMPS] tube structure/failure. (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 8 May 1997 08:44:23 +0000; Hi Skip, Fair enough. It's great to see someone disagree without personal attack. What were the conditions when the tube flashed? Was the PA drawing grid current withjout drive? Were grid or catode c; /archives//html/Amps/1997-05/msg00050.html (11,002 bytes)
274. [AMPS] Re: amp input tuned circuits (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 9 May 1997 22:36:50 +0000; To: <amps@contesting.com> Not in a grid driven AB1 PA Morel. In that case, the tuned input makes no difference at all. Only in cathode driven AB or shorter conduction angle PA, or grid driven non-sw; /archives//html/Amps/1997-05/msg00060.html (7,854 bytes)
275. Fwd: [AMPS] How do filaments break? (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 11 May 1997 10:07:52 +0000; But the cable MELT long before they are torn apart by the tiny little twitch produced by many HUNDREDS of amperes. Anyone who remembers looking at a series filament string in an All-American-Five ra; /archives//html/Amps/1997-05/msg00063.html (11,723 bytes)
276. [AMPS] Filament breakage (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 11 May 1997 14:35:39 +0000; It would be nice if one of the proponents of "parasitics breaking filaments" could mathematically demonstrate how current levels intense enough to produce magnetic forces strong enough to break the f; /archives//html/Amps/1997-05/msg00067.html (10,478 bytes)
277. [AMPS] Filament breakage (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 12 May 1997 11:44:58 +0000; There certainly are multiple causes Carl, but it is quite obvious from the emission limitations of the tube and the actual mechanical force available it can not be the direct result of an oscillatio; /archives//html/Amps/1997-05/msg00084.html (12,560 bytes)
278. [AMPS] emission (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 13 May 1997 11:26:48 +0000; On page 18 of Care and Feeding of Power Grid Tubes (Varian): "a thoriated filament will produce a specific PEAK emission of about 70 to 100 mA per watt of filament heating power. This is normally 5 t; /archives//html/Amps/1997-05/msg00090.html (7,741 bytes)
279. [AMPS] emission (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 14 May 1997 10:33:32 +0000; Specific peak emission is the saturated emission of the filament. It is impossible to obtain values much larger than this emission, the tube would arc first. Let me give an example, a 3-500Z (a 75 w; /archives//html/Amps/1997-05/msg00102.html (10,820 bytes)
280. [AMPS] Filament breakage (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 14 May 1997 10:33:32 +0000; Hi Carl, Why the personal comments implying I am telling a "story"? If you'd listen as much as you spew insults, you'd learn. ALL tubes, no matter how "mature", outgas. Outgassing is a normal part of; /archives//html/Amps/1997-05/msg00103.html (13,442 bytes)

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