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Total 45 documents matching your query.

21. Re: [Amps] Step start (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 7 Feb 2008 10:12:09 +0900; GM all As Steve told whatever loop (open or closed) has been chosen a situation where a relay contact will not close and inrush-current limitation resistor R will never be shorten can happen. To addr; /archives//html/Amps/2008-02/msg00035.html (8,191 bytes)
22. Re: [Amps] Step start (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 7 Feb 2008 07:15:41 +0000; A much simpler solution is a slow-blow (T) fuse in series with the current limiting resistor. This idea has been used by Alpha and others for many years. The fuse rating can be about 25% of the long-; /archives//html/Amps/2008-02/msg00036.html (9,834 bytes)
23. Re: [Amps] Step start (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Thu, 7 Feb 2008 04:54:13 -0800 (PST); I guess I'll chime in with my limited input. Why not use simple "Inrush Current Limter thermistors ? I use them for my 4-1000A amp and my 7.5Kv power supply. Very simple to install and ver efficient.; /archives//html/Amps/2008-02/msg00037.html (11,273 bytes)
24. Re: [Amps] Step start (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 07 Feb 2008 22:12:09 +0000; If turn on speed isn't a major issue, I like the idea that the maximum surge at turn on doesn't exceed the maximum peak current during normal operation. That means higher value resistors and longer; /archives//html/Amps/2008-02/msg00042.html (8,232 bytes)
25. Re: [Amps] Step start (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Fri, 8 Feb 2008 19:35:19 +0900; Thanks to the nice comment from Ian, I am confident that I can realize a highly reliable amplifier than the solar cycle-23. As I am now under construction to install multiple filter capacitors into m; /archives//html/Amps/2008-02/msg00043.html (8,571 bytes)
26. Re: [Amps] Step start (score: 1): Author: "Patrick Egloff" <pegloff@gmail.com>; Date: Fri, 8 Feb 2008 15:27:46 +0100; Hello Mike, Are'nt those beasts a little bit too resistive under normal operating conditions and temperature ?? According to the datas found on the page you provided, the lowest value is 0.5 Ohm, whi; /archives//html/Amps/2008-02/msg00045.html (13,179 bytes)
27. Re: [Amps] Step start (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Fri, 8 Feb 2008 07:01:40 -0800 (PST); Patrick, Here's what I'm using in both my primary lines of both of my power supplies, the 4-1000A and GS35B. ____________________________________________________ Part R@ ** __________________________; /archives//html/Amps/2008-02/msg00046.html (14,797 bytes)
28. [Amps] step start (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sun, 1 Oct 2023 14:19:59 -0400 (EDT); Hello all. I'm building a 4cx1500b amplifier. This is the first tetrode high power amplifier I've tried to do. I'm using about 300V on the screen and 2500 on the plate. For my power supply I'm using; /archives//html/Amps/2023-10/msg00000.html (6,557 bytes)
29. Re: [Amps] step start (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sun, 1 Oct 2023 12:43:13 -0700; Nice project, Paul. I built my first tetrode amp a couple of years ago, and I was dubious I could carry it off, but it worked well and was fun. I have website at w8zr.net with photos and schematics.; /archives//html/Amps/2023-10/msg00001.html (8,777 bytes)
30. Re: [Amps] step start (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sun, 1 Oct 2023 23:06:19 +0300; Plate voltage regulation on a tetrode is not very important, because the screen voltage has a much greater influence on the plate current. 93 uf is quite a lot for the plate supply, imho more than yo; /archives//html/Amps/2023-10/msg00002.html (9,384 bytes)
31. Re: [Amps] step start (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Sun, 1 Oct 2023 23:15:52 +0300; I mentioned the need for a 3 minute delay before turning on plate and screen voltages, but Jim is right -- you CAN turn on plate voltage immediately. Just keep the bias on so the tube is cut off for; /archives//html/Amps/2023-10/msg00003.html (9,964 bytes)
32. Re: [Amps] step start (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 2 Oct 2023 08:14:05 -0400 (EDT); I was thinking the step start could be put onto both the screen and the plate voltage transformer. Since the screen dumps into a 1 Henry, it does take some time for that to charge so they both should; /archives//html/Amps/2023-10/msg00004.html (8,608 bytes)
33. Re: [Amps] step start (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Mon, 2 Oct 2023 16:42:10 +0300; Why do you want a soft start on either plate or screen voltage? What function does it serve? 73, Victor, 4X6GP Rehovot, Israel formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ It's easy enough to; /archives//html/Amps/2023-10/msg00005.html (9,444 bytes)
34. [Amps] step start (score: 1): Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>; Date: Mon, 2 Oct 2023 07:46:58 -0700; <Why do you want a soft start on either plate or screen voltage? What <function does it serve? <73, <Victor, 4X6GP <Rehovot, Israel <formerly K2VCO Switch on a B+ supply with a 93uf filter cap, with; /archives//html/Amps/2023-10/msg00006.html (7,648 bytes)
35. Re: [Amps] step start (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Mon, 2 Oct 2023 19:33:05 +0300; Of course I understand that. But I got the impression from the original post that he thought there was some reason to apply plate/screen voltages to the tube slowly. 73, Victor, 4X6GP Rehovot, Israel; /archives//html/Amps/2023-10/msg00008.html (8,814 bytes)
36. Re: [Amps] step start (score: 1): Author: Val <val@vip.bg>; Date: Mon, 2 Oct 2023 21:21:28 +0300; Hello Paul, As you will put the step start circuit in the transformer primary, it will limit the transformer inrush current and thus all the voltages provided by the transformer - filament, screen, g; /archives//html/Amps/2023-10/msg00009.html (8,843 bytes)
37. Re: [Amps] step start (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 2 Oct 2023 15:54:39 -0400 (EDT); Hi Jim, I was actually using the Harris RF-124 power supply as a design guide, but also trying to use parts that I have on hand at the same time. I'm using a Hammond 193S DC Filter Choke, inductance; /archives//html/Amps/2023-10/msg00010.html (8,549 bytes)
38. Re: [Amps] step start (score: 1): Author: Alek Petkovic via Amps <amps@contesting.com>; Date: Tue, 3 Oct 2023 08:00:29 +0800; If you want a great soft start, just go to Ebay and search for 100A 4000W High-Power Soft Start Circuit I bought 10 of them and have used them in 3 projects so far. They are very quiet and all self c; /archives//html/Amps/2023-10/msg00011.html (10,568 bytes)
39. Re: [Amps] step start (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 3 Oct 2023 15:52:28 -0400 (EDT); And easier to wind. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2023-10/msg00014.html (7,356 bytes)
40. Re: [Amps] step start (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 4 Oct 2023 07:31:15 -0400 (EDT); Hello group, The take-aways I received so far are: 1. Absolutely have a Plate soft start esp with 200 - 500 uF in the HV. 2. Plate regulation is not as critical as screen regulation. 3. Never apply s; /archives//html/Amps/2023-10/msg00015.html (7,456 bytes)

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