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281. Re: [Amps] PSU design question (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 7 Nov 2009 23:01:08 +0000; Me too. I don't think there is any wonderfully safe way, as all three power supplies - HV, grid and screen - are only connected to chassis through the G2+ connection. In particular it needs a fully f; /archives//html/Amps/2009-11/msg00112.html (9,550 bytes)
282. Re: [Amps] PSU design question (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 8 Nov 2009 08:19:46 +0000; I could be more persuaded by your earlier message which took the opposite view, that the resistor is not needed at all. But we are all in danger of focusing on one small part of the circuit without l; /archives//html/Amps/2009-11/msg00120.html (11,017 bytes)
283. Re: [Amps] B- questions (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 9 Nov 2009 08:16:55 +0000; Carl's experience isn't surprising at all, because older commercial amplifiers contain enough horrors to keep a repairman in business for a very long time. Many older amps do nothing to limit the max; /archives//html/Amps/2009-11/msg00133.html (10,337 bytes)
284. [Amps] George Badger, W6TC (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 17 Nov 2009 18:13:38 +0000; W6TC was one of the old Eimac gang, and it was sad to see in 'The Daily DX' that he died two days ago, aged 84. Others can write more about his career with Eimac and Svetlana, but I would like to rec; /archives//html/Amps/2009-11/msg00198.html (6,776 bytes)
285. Re: [Amps] QRO Parts sources (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 24 Nov 2009 06:38:14 +0000; Oh, so THAT's where they all went... -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-11/msg00252.html (7,218 bytes)
286. Re: [Amps] Hot stick (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 11 Dec 2009 07:16:43 +0000; http://www.repairfaq.org/sam/captest.htm#ctcds -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2009-12/msg00294.html (7,352 bytes)
287. [Amps] Ready built Tetrode Boards for sale in UK (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 3 Jan 2010 20:07:57 +0000; ebay.co.uk item number 300383253850, ending in 6 days. (I have no connection with this sale, except to note that it's from an established customer. He also has a 230V AC mains transformer.) -- 73 fro; /archives//html/Amps/2010-01/msg00011.html (6,786 bytes)
288. Re: [Amps] which HV connector to use? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 13 Jan 2010 07:40:39 +0000; MHV are a dangerously bad design - a BNC plug can quite easily be mated with an MHV socket. The single-pole Millen connectors are also dangerous because there's nothing to prevent a user from connect; /archives//html/Amps/2010-01/msg00131.html (10,716 bytes)
289. Re: [Amps] Single pole Millen HV connectors. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 13 Jan 2010 11:52:17 +0000; [... and several other good safety precautions too.] That's great... but it's only safe if you ALWAYS connect the B-minus and/or ground bonding BEFORE you connect the B+ and switch on. With a single-; /archives//html/Amps/2010-01/msg00138.html (8,436 bytes)
290. Re: [Amps] which HV connector to use? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 13 Jan 2010 22:15:16 +0000; The MHV plug will not go into a BNC socket, but a BNC plug *will* go into an MHV socket. If someone isn't aware that it's meant to be impossible, it really doesn't need much extra force. -- 73 from I; /archives//html/Amps/2010-01/msg00162.html (10,378 bytes)
291. Re: [Amps] Source for large purchase of toroids? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 26 Jan 2010 20:03:36 +0000; -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-01/msg00353.html (9,206 bytes)
292. Re: [Amps] 144MHz Linear (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 1 Feb 2010 22:18:34 +0000; Moi...? -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-02/msg00043.html (8,113 bytes)
293. Re: [Amps] QRO questions (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 7 Feb 2010 16:31:07 +0000; There is no chlorine in Teflon (PTFE, poly-tetrafluoroethylene). When Teflon is burned, the gas given off is hydrogen fluoride (HF). It does smell a little like chlorine, but it's much more biting in; /archives//html/Amps/2010-02/msg00188.html (9,850 bytes)
294. Re: [Amps] Vac Relays for B+ (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 7 Feb 2010 18:44:51 +0000; A genuine purpose-designed HV fuses don't look anything like a small resistor. That should be telling us something... Yes - and Jim VE7RF had it right too: INTERRUPTS the current ! That's right: two; /archives//html/Amps/2010-02/msg00197.html (9,426 bytes)
295. Re: [Amps] kW dummy load resistors (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 19 Feb 2010 13:10:24 +0000; Another option, using thin film resistors on a large air-cooled heatsink: http://www.granta.g4axx.com/Attenuator.php3 This is actually a 30dB attenuator, so 1kW input delivers a 1W sample at the out; /archives//html/Amps/2010-02/msg00564.html (8,002 bytes)
296. Re: [Amps] Clipperton-L parasitic suppressors (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 13 Mar 2010 08:22:57 +0000; Sorry, Carl, that isn't correct: Measures was not banned for his theories (wrong and tiresome though they were). He was actually banned for bad *behavior*, which was tolerated far longer on AMPS than; /archives//html/Amps/2010-03/msg00196.html (9,434 bytes)
297. Re: [Amps] Clipperton-L parasitic suppressors (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 13 Mar 2010 20:21:32 +0000; I don't want to re-start that war either, but there is now a new generation of participants who weren't there at the time. There is a big and *important* difference between banning someone for his te; /archives//html/Amps/2010-03/msg00206.html (10,115 bytes)
298. Re: [Amps] 91B problem in Paraguay (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 21 Mar 2010 14:56:19 +0000; I don't have the schematic but am fairly sure the "2A T" fuses protect the step start resistors at the mains input. They blow when the step-start relay fails to close. You should be able to hear that; /archives//html/Amps/2010-03/msg00440.html (7,731 bytes)
299. Re: [Amps] placement of RF choke bypass cap. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 25 Mar 2010 07:19:30 +0000; This discussion is getting lost; we need to get back to that original question about the padder cap. Bill: please can you post photographs of "above" and "below" the chassis, so that other people can; /archives//html/Amps/2010-03/msg00602.html (9,838 bytes)
300. Re: [Amps] ripple in B+ supply. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 25 Mar 2010 14:23:11 +0000; PSU Designer will simulate a constant-current load which can step to a different value after a specified period of time. This allows you to simulate two levels of current draw and the worst-case step; /archives//html/Amps/2010-03/msg00611.html (7,944 bytes)

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