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Total 19 documents matching your query.

1. [Amps] HV resistor source (score: 1): Author: "Drax Felton" <draxfelton@gmail.com>; Date: Tue, 16 Apr 2013 23:52:40 -0400; So where does one find a 30 to 50 ohm 25 watt resistor that can safely handle 4000v? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2013-04/msg00142.html (6,255 bytes)
2. Re: [Amps] HV resistor source (score: 1): Author: "Jim Garland" <4cx250b@miamioh.edu>; Date: Tue, 16 Apr 2013 22:03:57 -0600; That's going to be quite a resistor, inasmuch as 4KV across a 30 ohm resistor amounts to a half million watts of dissipation! A 4KV pulse 50uS wide, once per second, would dissipate 25W. 73, Jim W8ZR; /archives//html/Amps/2013-04/msg00144.html (7,872 bytes)
3. Re: [Amps] HV resistor source (score: 1): Author: "Drax Felton" <draxfelton@gmail.com>; Date: Wed, 17 Apr 2013 00:06:12 -0400; So then what is the Radio Handbook talking about where it uses a 10ohm/20w one between the plate choke and the +HV? That's going to be quite a resistor, inasmuch as 4KV across a 30 ohm resistor amoun; /archives//html/Amps/2013-04/msg00145.html (8,292 bytes)
4. Re: [Amps] HV resistor source (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Tue, 16 Apr 2013 23:37:24 -0500; That is for a glitch - the resistor limits the current in the even the tube (or whatever) arcs and dumps the B+ to ground. The caps will discharge through that resistor. I went through that sourcing; /archives//html/Amps/2013-04/msg00147.html (9,050 bytes)
5. Re: [Amps] HV resistor source (score: 1): Author: donroden@hiwaay.net; Date: Wed, 17 Apr 2013 00:58:47 -0500; That's going to be quite a resistor, inasmuch as 4KV across a 30 ohm resistor amounts to a half million watts of dissipation! A 4KV pulse 50uS wide, once per second, would dissipate 25W. 73, Jim W8Z; /archives//html/Amps/2013-04/msg00149.html (7,680 bytes)
6. Re: [Amps] HV resistor source (score: 1): Author: "Ian White" <gm3sek@ifwtech.co.uk>; Date: Wed, 17 Apr 2013 08:54:47 +0100; may draw 1 watts. Correct, the resistor needs to be rated 30W or more to handle normal operating loads. amp acting Sorry, NOT correct - two times over. First of all, if a fuse or resistor is rated t; /archives//html/Amps/2013-04/msg00150.html (9,860 bytes)
7. Re: [Amps] HV resistor source (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Wed, 17 Apr 2013 01:18:18 -0700; REPLY: I suspect he's referring to the insulation rating of the resistor. Bill, W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2013-04/msg00151.html (7,288 bytes)
8. Re: [Amps] HV resistor source (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Wed, 17 Apr 2013 18:28:11 +0900; Yes it is. Arc inside tube or HV touch to the ground make a large surge current. Without the series resistor tube, power supply diodes, meter circuits may be damaged. Or sometimes itself can burn or; /archives//html/Amps/2013-04/msg00152.html (7,747 bytes)
9. Re: [Amps] HV resistor source (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Wed, 17 Apr 2013 06:31:03 -0500 (CDT); a 50 ohm 25w resistor only needs to handle 35v terminal to terminal... the rest you have to handle by providing proper clearance for mounting it. So where does one find a 30 to 50 ohm 25 watt resisto; /archives//html/Amps/2013-04/msg00154.html (7,798 bytes)
10. Re: [Amps] HV resistor source (score: 1): Author: donroden@hiwaay.net; Date: Wed, 17 Apr 2013 07:35:48 -0500; If the tube draws more amps ... a short or a bad load... maybe a two amp spike... that is 120 watts which will hopefully burn out the resistor ( acting like a fuse ) before the transformer or diode; /archives//html/Amps/2013-04/msg00155.html (8,575 bytes)
11. Re: [Amps] HV resistor source (score: 1): Author: "Ian White" <gm3sek@ifwtech.co.uk>; Date: Wed, 17 Apr 2013 14:06:04 +0100; I meant "wrong in two different ways" as the two following paragraphs explained. 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2013-04/msg00157.html (8,111 bytes)
12. [Amps] HV resistor source (score: 1): Author: "Doug Renwick" <ve5ra@sasktel.net>; Date: Wed, 17 Apr 2013 09:46:10 -0600; Ten Tec 425 Titan uses a single 10 ohm, 25 watt ohmite wirewound. Doug "Think of all the ways you can hurt yourself laughing." --Original Message-- That is for a glitch - the resistor limits the curr; /archives//html/Amps/2013-04/msg00159.html (6,708 bytes)
13. Re: [Amps] HV resistor source (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 17 Apr 2013 12:24:18 -0400; It would be nice if the resistor survived a dead short but it only need to limit current to a fuse opens. I typically use 15-20 Ohm 25W for the average 1500W amp...even if it does 2500W (-; Dentron t; /archives//html/Amps/2013-04/msg00160.html (8,565 bytes)
14. Re: [Amps] HV resistor source (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Wed, 17 Apr 2013 09:30:16 -0700 (GMT-07:00); "Dentron took a different approach with a pair of 1 Ohm 1/2W carbon in parallel which appears to be a bit dangerous if an arc developed." The Drake L4B uses a .75 ohm 2 watt resistor as I recall. I r; /archives//html/Amps/2013-04/msg00161.html (8,203 bytes)
15. [Amps] HV Resistor Source (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 17 Apr 2013 14:24:17 -0600; The "industry standard" for such a resistor is a pulse rated R like a Kanthal Globar. The company has changed names a lot recently, so search for them. These are carborundum bulk resistors, non induc; /archives//html/Amps/2013-04/msg00163.html (9,798 bytes)
16. Re: [Amps] HV Resistor Source (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 17 Apr 2013 18:19:59 -0400; Ameritron/MFJ sells a Globar they use for a glitch in their "senior" amps. Overpriced and uneeded IMO at those power levels. A plasma isnt going to even get started before the fuse blows anyway...thi; /archives//html/Amps/2013-04/msg00165.html (10,826 bytes)
17. Re: [Amps] HV resistor source (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Wed, 17 Apr 2013 19:39:37 -0400; So then what is the Radio Handbook talking about where it uses a 10ohm/20w one between the plate choke and the +HV? That's going to be quite a resistor, inasmuch as 4KV across a 30 ohm resistor amou; /archives//html/Amps/2013-04/msg00166.html (9,807 bytes)
18. Re: [Amps] HV resistor source (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 18 Apr 2013 09:20:58 +0900; A larger protection resistor is better because of its sustainability against any surge current. A small watt resistor can be used but it will act as a fuse. I again recommend 30-50 ohm 25-100 watt re; /archives//html/Amps/2013-04/msg00167.html (8,833 bytes)
19. Re: [Amps] HV Resistor Source (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Wed, 17 Apr 2013 23:10:36 -0600; Carborundum resistors were also common in tube FM broadcast transmitters down to 1 kW level for the same application. Dale or Ohmite (or Ward Leonard!) 25 watt wirewound resistors don't hold off volt; /archives//html/Amps/2013-04/msg00173.html (9,151 bytes)

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