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Total 38 documents matching your query.

1. [Amps] MOVs (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Thu, 25 Nov 2010 07:53:01 -1000; I don't understand how this can be a useful device. I thought that MOVs were supposed to draw lots of current, instead of letting it got elsewhere causing damage to more expensive and sensitive elec; /archives//html/Amps/2010-11/msg00439.html (7,640 bytes)
2. Re: [Amps] MOVs (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 25 Nov 2010 13:08:03 -0500; A 130V MOV on the 120V AC line would get hot in a hurry 1,414 * 120 = 169.7V so the thing would be conducting a high percentage of the time. You'd want at least a 180V MOV. That is correct, but an un; /archives//html/Amps/2010-11/msg00442.html (8,703 bytes)
3. Re: [Amps] MOVs (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 25 Nov 2010 11:13:55 -0800; It is my experience that MOVs should not be placed directly across the mains; they should have some limiting impedance, just like zeners do in a dc circuit. I always fit them downstream of the mains; /archives//html/Amps/2010-11/msg00444.html (9,487 bytes)
4. Re: [Amps] MOVs (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 25 Nov 2010 14:30:34 -0500; A MOV does not catch on fire, its other components that are placed incorrectly that are the problem. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2010-11/msg00447.html (8,427 bytes)
5. Re: [Amps] MOVs (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 25 Nov 2010 16:54:01 -0500; MOVs should be installed down stream of fuses or breakers. I should have said no flammable objects should be placed close to them. Carl is correct, MOVs don't normally catch fire, but a shorted one c; /archives//html/Amps/2010-11/msg00453.html (10,394 bytes)
6. Re: [Amps] MOVs (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Thu, 25 Nov 2010 15:06:11 -0800; Roger Did those SCRs have an L/C filter out to the mains? I fit a MOV directly across the SCR or Triac. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2010-11/msg00454.html (8,863 bytes)
7. Re: [Amps] MOVs (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 25 Nov 2010 19:06:05 -0500; That was over 23 years ago, so you have already heard my complete memories of the hook up. <:-(( 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2010-11/msg00455.html (9,576 bytes)
8. [Amps] MOVs (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 25 Nov 2010 21:53:51 -0800; A 130V MOV on the 120V AC line would get hot in a hurry 1,414 * 120 = 169.7V so the thing would be conducting a high percentage of the time. You'd want at least a 180V MOV. peak rating. MOV's are not; /archives//html/Amps/2010-11/msg00465.html (11,489 bytes)
9. Re: [Amps] MOVs (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 26 Nov 2010 02:20:26 -0500; Not according to the manual. GMOVs according to the manual are rated at breakdown voltage and not RMS. They may have changed due to people not being smart enough to figure out the difference between; /archives//html/Amps/2010-11/msg00468.html (14,603 bytes)
10. [Amps] MOVs (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 26 Nov 2010 06:06:45 -0800; Some where around here I think I might still have one of those 50,000 joule MOVs and they are big. They are mounted on their own aluminum back plate. IIRC they are about 2.5 X 3.5 X about 1" thick. 7; /archives//html/Amps/2010-11/msg00481.html (8,656 bytes)
11. [Amps] MOVs (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Mon, 07 Jan 2013 09:50:39 -0800; I have a power supply that needs to work here in the US and in Israel, where power is supplied as one phase of 240V plus a safety ground. I am not sure if one of the 240V lines is grounded as well. T; /archives//html/Amps/2013-01/msg00060.html (7,315 bytes)
12. Re: [Amps] MOVs (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Wed, 09 Jan 2013 08:27:10 -0800; Interesting. When I lived there the pins were flat with two of them angled. Apparently the standard changed to round pins some years ago; new sockets accept both types. But what I am interested in is; /archives//html/Amps/2013-01/msg00062.html (9,947 bytes)
13. Re: [Amps] MOVs (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 09 Jan 2013 10:59:00 -0800; That is NOT a good thing, because the spike raises the instantaneous voltage on the green wire. That can (and often does) cause destructive failures of interconnected equipment powered from a differe; /archives//html/Amps/2013-01/msg00066.html (8,867 bytes)
14. Re: [Amps] MOVs (score: 1): Author: Mike Tubby <mike@tubby.org>; Date: Wed, 09 Jan 2013 19:25:24 +0000; Vic, In the UK the AC supply is single phase 230V AC (was 240V AC until we re-aligned with the rest of Europe), there are three wires: Live (Phase) => 230 VAC Neutral (Return) => 0V ref Live Earth (S; /archives//html/Amps/2013-01/msg00067.html (8,616 bytes)
15. Re: [Amps] MOVs (score: 1): Author: Gene May <gene-may@hotmail.com>; Date: Wed, 9 Jan 2013 18:07:39 -0500; Vic K2VCO and all, You are correct that the technique to be used in the USA -- two VA130 MOVs each connected from one of the hot wires to ground -- wouldn't work with no ground. I have used the follo; /archives//html/Amps/2013-01/msg00068.html (9,408 bytes)
16. [Amps] MOVs (score: 1): Author: "Gary \"Joe\" Mayfield" <gary_mayfield@hotmail.com>; Date: Wed, 22 Jan 2014 22:40:05 -0600; Going to rebuild the supply on my Ten Tec Titan. What are folks thoughts about MOVs on the primary side of the transformer? There were not any in the original build. 73, Joe kk0sd ___________________; /archives//html/Amps/2014-01/msg00220.html (6,335 bytes)
17. Re: [Amps] MOVs (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 22 Jan 2014 21:59:00 -0800; Bad idea. ANY MOV on branch circuits is a bad idea. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp; /archives//html/Amps/2014-01/msg00221.html (7,411 bytes)
18. Re: [Amps] MOVs (score: 1): Author: Jim W7RY <w7ry@centurytel.net>; Date: Wed, 22 Jan 2014 22:11:13 -0800; Why? 73 Jim W7RY On 1/22/2014 9:59 PM, Jim Brown wrote: On 1/22/2014 8:40 PM, Gary "Joe" Mayfield wrote: What are folks thoughts about MOVs on the primary side of the transformer? Bad idea. ANY MOV o; /archives//html/Amps/2014-01/msg00222.html (7,814 bytes)
19. Re: [Amps] MOVs (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 22 Jan 2014 22:45:27 -0800; Because MOV's conduct surge currents onto ground, and the IR (and IZ) drop raises the potential of the chassis. When the "protected" equipment has a low voltage connection to other equipment powered; /archives//html/Amps/2014-01/msg00223.html (8,146 bytes)
20. Re: [Amps] MOVs (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 23 Jan 2014 07:18:46 -0800; If the amp is running off 240V where in the USA this is symmetrical about ground and then the MOV is placed between the two phases, it seems to me that there would not be a surge current to ground. -; /archives//html/Amps/2014-01/msg00224.html (9,355 bytes)

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