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1. [AMPS] High Voltage fuses (score: 1): Author: asamson@orausa.com (Alexander Samson); Date: Tue, 21 Jul 1998 10:28:37 -0700; This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. -- =_NextPart_001_01BDB4CC.FFA4D504 Content-Type: text/plain Hi; /archives//html/Amps/1998-07/msg00120.html (11,365 bytes)
2. [AMPS] high voltage fuses (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Jul 1998 09:05:10 +0100; I have used (very successfully) a length of 40 gauge enamelled wire about 6 inches long between two ceramic insulators. If it arcs, it rapidly falls to the bottom of the cabinet, and there's no tube; /archives//html/Amps/1998-07/msg00126.html (7,245 bytes)
3. [Amps] high voltage fuses (score: 1): Author: "Danny Pease" <dpease@adams.net>; Date: Tue, 9 Sep 2008 08:40:12 -0500; After reading a few of the comments about high voltage fuses, we may need a reminder about voltage ratings. Using a 3AG glass fuse in a high voltage lead is a very cheap and dirty method, but the 3AG; /archives//html/Amps/2008-09/msg00074.html (7,230 bytes)
4. Re: [Amps] high voltage fuses (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Tue, 9 Sep 2008 12:52:16 -0400; NG9R SAID: "Also, using small wire for a HV fuse (which I have done myself in a pinch), please be careful about the positioning and mounting of such a fuse. Make sure when it does open, ends of the o; /archives//html/Amps/2008-09/msg00085.html (7,111 bytes)
5. [Amps] high voltage fuses (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Sun, 06 Oct 2013 10:30:52 -0400; For what it's worth, I see that there are a lot of inexpensive 5KV 0.75-1.0 amp glass fuses listed on ebay for microwave oven use. I assume these would also work in a legal ham amp? -- 73, Pete N4ZR; /archives//html/Amps/2013-10/msg00073.html (7,201 bytes)
6. Re: [Amps] high voltage fuses (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 6 Oct 2013 10:53:36 -0400; Thats a bit too close for even a 1200W amp. Might be fine for something in the SB-200/AL-80 size amp. Size the fuse at 2 to 2.5 times the actual peak current, not steady state key down. Carl KM1H For; /archives//html/Amps/2013-10/msg00074.html (7,936 bytes)
7. [Amps] high voltage fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 7 Oct 2013 08:49:24 -0700; than 5-10% higher than the amps steady state, key down current. Just make sure to put the HV fuse BEFORE the glitch resistor. The glitch resistor can go in the RF deck, or in the HV supply. IMO, for; /archives//html/Amps/2013-10/msg00093.html (8,449 bytes)
8. Re: [Amps] high voltage fuses (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 7 Oct 2013 12:23:06 -0400; Instantaneous peak current can be a lot more than 5-10% more than key down and long term stressing of an underated fuse will eventually fail. A tube arc/short instantaneous current will take out a 2-; /archives//html/Amps/2013-10/msg00097.html (11,668 bytes)
9. Re: [Amps] high voltage fuses (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Mon, 7 Oct 2013 16:24:51 +0000; I would recommend a fuse wire between two post surrounded by grounded conductive tubing. Why? When the fuse blows the plasma will conduct the rest of the current straight to ground acting as a self s; /archives//html/Amps/2013-10/msg00099.html (10,506 bytes)
10. Re: [Amps] high voltage fuses (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Mon, 7 Oct 2013 16:29:40 +0000; Every one should read the actual specifications of the fuses they use. The rating does not mean the same on the non-slow blow fuses. It is not like there is a definite threshold where the fuse conduc; /archives//html/Amps/2013-10/msg00100.html (12,390 bytes)
11. Re: [Amps] high voltage fuses (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Mon, 07 Oct 2013 10:23:20 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Not a good idea. The HV positive does not want to go to ground, it wants to go to HV negative. In nearly all amplifiers the path from ground to HV negative i; /archives//html/Amps/2013-10/msg00105.html (7,909 bytes)
12. Re: [Amps] high voltage fuses (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Mon, 7 Oct 2013 18:13:28 +0000; Perhaps I should have said return rather than ground. ORIGINAL MESSAGE: (may be snipped) REPLY: Not a good idea. The HV positive does not want to go to ground, it wants to go to HV negative. In nearl; /archives//html/Amps/2013-10/msg00106.html (8,161 bytes)
13. Re: [Amps] high voltage fuses (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 07 Oct 2013 21:44:20 +0000; When the fuse blows the plasma will conduct the rest of the current straight to ground acting as a self sacrificial crowbar. It's far better to avoid letting plasma loose in a circuit. You know, that; /archives//html/Amps/2013-10/msg00111.html (10,437 bytes)
14. Re: [Amps] high voltage fuses (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Mon, 07 Oct 2013 16:42:48 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Simple electromagnetic radiation, the same as from your TX. Remember spark transmitters? I don't either but I've heard of them. :-) In fact, this phenomenon; /archives//html/Amps/2013-10/msg00116.html (8,052 bytes)
15. Re: [Amps] high voltage fuses (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 7 Oct 2013 21:09:30 -0400; When I worked for High Voltage Engineering for a short time 1969-70 after leaving National I watched 100-250KV power supplys do their thing behind thick steel and brick doors and thru leaded glass. E; /archives//html/Amps/2013-10/msg00118.html (12,743 bytes)
16. Re: [Amps] high voltage fuses (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Tue, 8 Oct 2013 05:32:14 +0000; I have a copy, poorly translated to English, of Hertz's lab notes and experiments. I found it to be very interesting reading. Oddly as it may seem, he discovered the photoelectric effect, some times; /archives//html/Amps/2013-10/msg00120.html (9,482 bytes)
17. Re: [Amps] high voltage fuses (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Tue, 8 Oct 2013 05:36:25 +0000; Halon, Freon and Sulfur Hexafluoride are great for snuffing out plasma. That is why they are bad for the ionosphere. 73 Bill wa4lav When I worked for High Voltage Engineering for a short time 1969-70; /archives//html/Amps/2013-10/msg00121.html (13,236 bytes)
18. Re: [Amps] high voltage fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 10 Oct 2013 03:15:25 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: Not a good idea. The HV positive does not want to go to ground, it wants to go to HV negative. In nearly all amplifiers the path from ground to HV negative i; /archives//html/Amps/2013-10/msg00177.html (10,501 bytes)
19. Re: [Amps] high voltage fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 10 Oct 2013 04:21:12 -0700; Instantaneous peak current can be a lot more than 5-10% more than key down and long term stressing of an underated fuse will eventually fail. A tube arc/short instantaneous current will take out a 2-; /archives//html/Amps/2013-10/msg00178.html (10,791 bytes)
20. Re: [Amps] high voltage fuses (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 10 Oct 2013 07:44:08 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: For what seems like the millionth time, placing diodes directly across the grid meter will not protect it. You must place a resistor in series with the meter; /archives//html/Amps/2013-10/msg00180.html (8,570 bytes)

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