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Total 32 documents matching your query.

1. [Amps] HV fuse (score: 1): Author: "Lane Zeitler" <ku7i@hotmail.com>; Date: Mon, 12 Jul 2004 17:11:01 -0700; Gents, Anyone remember what wire size to use for a HV fuse??? Looking for something that will pop at around 2 amps. Lane Ku7i _________________________________________________________________ FREE po; /archives//html/Amps/2004-07/msg00057.html (6,883 bytes)
2. Re: [Amps] HV fuse (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 13 Jul 2004 04:08:23 -0700; The trouble with high voltage fuses is that the metal vapor arc which forms as the fusing wire melts has only c. 30v drop. However, a low-ESR 3000v filter C can still do plenty of damage at 2970v, so; /archives//html/Amps/2004-07/msg00062.html (7,953 bytes)
3. Re: [Amps] HV fuse (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 13 Jul 2004 14:26:16 -0400; I have thought about fabricating a device to protect tubes. Eimac claims that if your crow bar circuit will protect a piece of #30 copper wire under short conditions it will protect the tube. What if; /archives//html/Amps/2004-07/msg00063.html (9,508 bytes)
4. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 14 Jul 2004 08:29:23 +0100; Bill Fuqua wrote: I have thought about fabricating a device to protect tubes. Eimac claims that if your crow bar circuit will protect a piece of #30 copper wire under short conditions it will protect; /archives//html/Amps/2004-07/msg00075.html (9,772 bytes)
5. Re: [Amps] HV fuse (score: 1): Author: "Oleg Skydan" <skidan@mail.ints.net>; Date: Thu, 15 Jul 2004 19:07:02 +0300; Hi, All ! What do you think about switching HV off with the vacuum relay ? Is it better than fuses/circuit breakers in the primaries of the PS transformer ? All the best ! Oleg 73 de UR3IQO _________; /archives//html/Amps/2004-07/msg00085.html (7,765 bytes)
6. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 15 Jul 2004 23:08:05 +0100; What do you think about switching HV off with the vacuum relay ? Is it better than fuses/circuit breakers in the primaries of the PS transformer ? It doesn't need to be as fast as a vacuum relay. Wit; /archives//html/Amps/2004-07/msg00088.html (8,877 bytes)
7. Re: [Amps] HV fuse (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 17 Jul 2004 05:51:21 -0700; On Jul 15, 2004, at 3:08 PM, Ian White, G3SEK wrote: Oleg Skydan wrote: Hi, All ! On the other hand, for tubes up to the 1500W class, Eimac's and Rich's recommendation is a good one: breakers, or Wha; /archives//html/Amps/2004-07/msg00095.html (9,898 bytes)
8. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 17 Jul 2004 17:59:08 +0100; R. Measures wrote: What do you think about switching HV off with the vacuum relay ? Is it better than fuses/circuit breakers in the primaries of the PS transformer ? It doesn't need to be as fast as; /archives//html/Amps/2004-07/msg00101.html (11,140 bytes)
9. Re: [Amps] HV fuse (score: 1): Author: "Oleg Skydan" <skidan@mail.ints.net>; Date: Sun, 18 Jul 2004 06:39:28 +0300; OK. Consider I have a 40 uF capacitor in the PS charged to 3000V (one that uses in the pulse laser PS). Will it be safe for electronic crowbar to discharge it ? My idea was having a glitch resistor a; /archives//html/Amps/2004-07/msg00105.html (8,930 bytes)
10. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 19 Jul 2004 07:45:53 +0100; Oleg Skydan wrote: OK. Consider I have a 40 uF capacitor in the PS charged to 3000V (one that uses in the pulse laser PS). Will it be safe for electronic crowbar to discharge it ? Good call - you hav; /archives//html/Amps/2004-07/msg00115.html (10,349 bytes)
11. RE: [Amps] HV fuse (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Mon, 19 Jul 2004 11:31:23 -0400; The US broadcast television transmitters using "inductive output tubes" (IOT) - essentially a single cavity output with a gridded electron gun - used triggered spark gaps to discharge the beam (anode; /archives//html/Amps/2004-07/msg00122.html (9,242 bytes)
12. Re: [Amps] HV fuse (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Mon, 19 Jul 2004 19:27:55 +0300; The Harris RF-110A uses a similar circuit for protecting the screen circuit from tube flash over discharge (R series resistor at the bottom of the screen's regulating string of zener which act a SCR;; /archives//html/Amps/2004-07/msg00123.html (12,508 bytes)
13. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 19 Jul 2004 17:44:02 +0100; Joe Subich, K4IK wrote: The US broadcast television transmitters using "inductive output tubes" (IOT) - essentially a single cavity output with a gridded electron gun - used triggered spark gaps to d; /archives//html/Amps/2004-07/msg00131.html (10,747 bytes)
14. Re: [Amps] HV fuse (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 19 Jul 2004 23:47:41 -0700; On Jul 19, 2004, at 9:27 AM, Traian wrote: "Ian White, G3SEK" wrote: Oleg Skydan wrote: OK. Consider I have a 40 uF capacitor in the PS charged to 3000V (one that uses in the pulse laser PS). Will it; /archives//html/Amps/2004-07/msg00132.html (10,514 bytes)
15. Re: [Amps] HV fuse (score: 1): Author: Traian <yo9fzs@office.deck.ro>; Date: Tue, 20 Jul 2004 10:22:14 +0300; Hi Rich, I think I wrote it wrong. The fuse was not actually destroyed (exploded) but interrupted, so it did its job. It is quite big, seems to be made from glassfibre+epoxy compound, hard to be dest; /archives//html/Amps/2004-07/msg00136.html (10,137 bytes)
16. Re: [Amps] HV fuse (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 21 Jul 2004 07:08:11 -0700; On Jul 20, 2004, at 12:22 AM, Traian wrote: Hi Rich, I think I wrote it wrong. The fuse was not actually destroyed (exploded) but interrupted, so it did its job. It is quite big, seems to be made fro; /archives//html/Amps/2004-07/msg00141.html (9,822 bytes)
17. Re: [Amps] HV fuse (score: 1): Author: peter.chadwick@Zarlink.Com; Date: Fri, 23 Jul 2004 09:19:31 +0100; Asbestos powder has also been used in the past, but not these days. The filling is called 'anti rupture powder': the idea is to keep the fuse wire intact although molten until it reaches a sufficient; /archives//html/Amps/2004-07/msg00154.html (8,914 bytes)
18. Re: [Amps] HV fuse (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 23 Jul 2004 02:54:31 -0700; On Jul 23, 2004, at 1:19 AM, peter.chadwick@Zarlink.Com wrote: Rich said: HV fuses normally contain silica sand to quench the metal vapor arc. Asbestos powder has also been used in the past, but not; /archives//html/Amps/2004-07/msg00155.html (9,657 bytes)
19. [Amps] HV Fuse (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 20 Sep 2019 15:04:12 -0400; Yesterday, I lost all four HV bridge rectifier modules in my Alpha PA-70V vapor-cooled amp. After replacement, HV returned but whatever caused the fault event also took out a 2N3053 switching transis; /archives//html/Amps/2019-09/msg00046.html (8,590 bytes)
20. Re: [Amps] HV Fuse (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Fri, 20 Sep 2019 22:34:14 +0300; Hi Paul, I dont think fuses in parallel are a good idea :-). But probably you werent serious. I dont know what the present rectifier modules are, but rather than trying to protect them with a fuse, I; /archives//html/Amps/2019-09/msg00047.html (10,211 bytes)

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