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1. [Amps] inexpensive HV fuse (score: 1): Author: Angel Vilaseca <avilaseca@bluewin.ch>; Date: Wed, 22 Jul 2009 08:20:51 +0200; Commercially available HV fuses are quite expensive. I thought of using a small spring instead, like the ones in ball-point pens. They are about one inch long and could be spread between two isolated; /archives//html/Amps/2009-07/msg00272.html (9,700 bytes)
2. Re: [Amps] inexpensive HV fuse (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 22 Jul 2009 03:40:52 -0400; This sounds good, but "I think" (not having tried it) that the bronze spring would lose its temper before the wire burned through leaving a rather limp wick. Most fuses have a much thinner portion fo; /archives//html/Amps/2009-07/msg00273.html (11,834 bytes)
3. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Wed, 22 Jul 2009 14:14:26 +0300; Response time, guys!!! Any thermally operated fuse is TOO SLOW to protect the tube. Besides, the spring can carry many tens of Amperes before it heats up enough to melt. You'll probably blow up diode; /archives//html/Amps/2009-07/msg00274.html (10,837 bytes)
4. Re: [Amps] inexpensive HV fuse (score: 1): Author: Dave white <mausoptik@btinternet.com>; Date: Wed, 22 Jul 2009 15:15:46 +0100; I concur..... If you want to limit flashover damage use a high power surge limit resistor in the HT line between capacitor stack and plate choke, and use a fuse or overcurrent trip in the primary The; /archives//html/Amps/2009-07/msg00275.html (7,848 bytes)
5. Re: [Amps] inexpensive HV fuse (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Wed, 22 Jul 2009 10:16:41 -0500; Ideally, if money were no object, we'd have power supply crowbars which would let you put a piece of magnet wire from HV to ground, and which would operate to keep the magnet wire intact after you pu; /archives//html/Amps/2009-07/msg00277.html (8,011 bytes)
6. Re: [Amps] inexpensive HV fuse (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Wed, 22 Jul 2009 18:55:38 +0200; I realized the 170 Joule crowbar for my 7.5KV HT supply with a string of thyristors, much more convinient then thyratrons and probably cheaper. 73 Peter resistor in the HT line between capacitor stac; /archives//html/Amps/2009-07/msg00278.html (8,699 bytes)
7. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 22 Jul 2009 14:17:34 -0700 (PDT); IGBT's have evolved to the point where one can build an Electronic Circuit Breaker that will disconnect the load in a microsecond or so. This approach avoids dumping all the energy from the filter ca; /archives//html/Amps/2009-07/msg00280.html (7,399 bytes)
8. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 22 Jul 2009 14:56:03 -0700; ORIGINAL MESSAGE: REPLY: Yes but..... That approach allows all the energy from the filter caps to be dumped into the arc. We're trying to avoid that. 73, Bill W6WRT __________________________________; /archives//html/Amps/2009-07/msg00281.html (7,397 bytes)
9. [Amps] inexpensive HV fuse (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 22 Jul 2009 19:28:04 -0400; back in the 50's I had saved my favorite piece of RG8 coax. I saved a foot of it just to use for fuses. Who knew what wires other vendors used. One strand of it's shield would blow about equivalent t; /archives//html/Amps/2009-07/msg00284.html (8,303 bytes)
10. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 22 Jul 2009 17:07:24 -0700; ORIGINAL MESSAGE: REPLY: The filter caps have two jobs: One is to filter out hum from the rectified DC and the other is to supply large amounts of energy during peak demand from the tube)s). I would; /archives//html/Amps/2009-07/msg00289.html (8,672 bytes)
11. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 22 Jul 2009 20:19:38 -0400; Of course you could always employ the method detailed by John Lyles about instantaneously (almost) dumping the capacitor bank in a 500KW amp! Carl KM1H _______________________________________________; /archives//html/Amps/2009-07/msg00291.html (10,573 bytes)
12. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 22 Jul 2009 17:30:28 -0700 (PDT); Hi Bill, Since it turns off in one uS, the filter cap(s) stay charged. The total let through power is on the order of one Joule. 73 & Good afternoon, Marv WC6W http://wc6w.50webs.com/ _______________; /archives//html/Amps/2009-07/msg00292.html (9,185 bytes)
13. Re: [Amps] inexpensive HV fuse (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 22 Jul 2009 21:00:22 -0400; Get someone to stand next to it, that has never had the honor of seeing how fast a crowbar can work.<:-)) Of course the Varistor route is also spectacular when dumping 50,000 joules off a 480 primary; /archives//html/Amps/2009-07/msg00294.html (11,833 bytes)
14. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 22 Jul 2009 18:46:33 -0700; ORIGINAL MESSAGE: REPLY: Apparently we are talking about different applications. The original discussion was how to avoid damage when the B+ arcs. In your post above you say " the filter cap(s) stay; /archives//html/Amps/2009-07/msg00295.html (8,375 bytes)
15. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 23 Jul 2009 08:24:24 -0700 (PDT); Hi Bill, Same application; 21st Century solution. Damage is avoided by shutting off the power, veryyyy quickly, rather than by shunting it. My post was in reply to the one that suggested using a crow; /archives//html/Amps/2009-07/msg00302.html (9,820 bytes)
16. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Thu, 23 Jul 2009 08:37:38 -0700; ORIGINAL MESSAGE: REPLY: Nothing wrong with shutting off the PS quickly, but if you leave the filter caps charged, any damage from the B+ arc will involve much more energy than if the B+ line were op; /archives//html/Amps/2009-07/msg00303.html (8,786 bytes)
17. Re: [Amps] inexpensive HV fuse (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 23 Jul 2009 08:41:57 -0700 (PDT); Hi Bill, The device I've proposed is located in the plate supply line between the PS filter caps and the tube. It is NOT on the primary side of the supply. 73 & Good morning, Marv WC6W http://wc6w.50; /archives//html/Amps/2009-07/msg00304.html (9,431 bytes)
18. Re: [Amps] inexpensive HV fuse (score: 1): Author: "k7rdx" <k7rdx@charter.net>; Date: Thu, 23 Jul 2009 09:43:00 -0700; Marv...Can you direct me to a roadmap for this type of device?I have always used series resistance in the B+ of my YC-156 amps but lightning fast high voltage cutoff seems a much better solution for; /archives//html/Amps/2009-07/msg00307.html (10,764 bytes)
19. Re: [Amps] inexpensive HV fuse (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Thu, 23 Jul 2009 19:03:14 +0200; In one amp I use a Jennings vacuum contactor. They are cheap on Ebay from time to time. http://www.jenningstech.com/pdf/cont/rt1g.pdf http://www.surplussales.com/relays/REVacRel-7.html http://www.glv; /archives//html/Amps/2009-07/msg00309.html (11,647 bytes)
20. Re: [Amps] inexpensive HV fuse (score: 1): Author: "Jim W7RY" <w7ry@arrl.net>; Date: Thu, 23 Jul 2009 10:57:25 -0700; The ones shown on the Surplus Sales site are very reasonably priced! And the are nice and small too. 73 Jim W7RY -- _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2009-07/msg00312.html (13,546 bytes)

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