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1. Re: [Amps] Bend allowance (score: 1): Author: Ian White G/GM3SEK <g3sek@ifwtech.co.uk>; Date: Thu, 4 Aug 2005 08:11:19 +0100; Staying on-line... what's the trick to prevent alumin(i)um from splitting on the outside edge of a bend where it is stretched? -- 73 from Ian G/GM3SEK 'In Practice' columnist for RadCom (RSGB) http:/; /archives//html/Amps/2005-08/msg00080.html (7,520 bytes)
2. Re: [Amps] Chassis construction question (score: 1): Author: Ian White G/GM3SEK <g3sek@ifwtech.co.uk>; Date: Thu, 4 Aug 2005 07:39:35 +0100; More ways to help a Greenlee or Q-max punch do its work: 1. The hardest work is in the early stages when you're trying to force the two blunt points of the punch through the metal. After that it gets; /archives//html/Amps/2005-08/msg00079.html (12,172 bytes)
3. Re: [Amps] HP / Agilent manuals (score: 1): Author: Ian White G/GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 18 Jul 2005 13:21:03 +0100; Des anyone have user and service manuals for the HP8640-A, please? (Not the B with the digital readout, but the A model with the slide-rule scale.) Same problems here - almost unreadable with Firefox; /archives//html/Amps/2005-07/msg00199.html (7,798 bytes)
4. Re: [Amps] 811As (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Wed, 13 Jul 2005 12:08:41 +0100; Thoriated tungsten filaments? Thorium is very mildly radioactive, but individual tubes contain such tiny quantities that they should be exempt from regulations in all countries. This seems like some; /archives//html/Amps/2005-07/msg00142.html (6,914 bytes)
5. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Wed, 13 Jul 2005 07:30:39 +0100; Only one copy of that message left from here, same as normal. Two reasons why I use this e-mail software: it ISN'T from Microsoft, and it NEVER inserts HTML markup tags. -- 73 from Ian G/GM3SEK _____; /archives//html/Amps/2005-07/msg00138.html (8,514 bytes)
6. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 23:04:47 +0100; A great deal, but I don't have time to trade the same old one-liners with him, yet again. However, the following are genuine questions so I'll try to answer them. The gettering (adsorption) reaction; /archives//html/Amps/2005-07/msg00129.html (10,025 bytes)
7. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 15:37:49 +0100; wrote: Not in every amp. Correct. I never said it was. Yes. Sit down and work it out. See the photos referenced in my other posting - which you have been pointed to several times before. There are ma; /archives//html/Amps/2005-07/msg00116.html (10,286 bytes)
8. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 15:25:19 +0100; Here's the story (it's a bit long, because I didn't have time to write a short one)... A so-called "vacuum" tube is actually a very complex piece of chemistry. For a start, the "vacuum" space is far; /archives//html/Amps/2005-07/msg00114.html (11,824 bytes)
9. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 10:14:07 +0100; wrote: As many folks will remember from previous repetitions of this topic, reasons for anode-screen arcs include: 1. Loss of load at a phase angle that results in extremely high anode voltages. With; /archives//html/Amps/2005-07/msg00108.html (11,233 bytes)
10. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 07:36:42 +0100; wrote: That simply isn't true. Well designed power supplies can protect the tube, the anode supply and the screen supply against a wide range of faults, including arcs. Many of these faults are compl; /archives//html/Amps/2005-07/msg00106.html (9,348 bytes)
11. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 11 Jul 2005 23:16:08 +0100; wrote: If the "glitch" is an arc from anode to screen, the mains fuse won't protect the screen at all. Both series and shunt screen regulators have good and bad points, but it's important to think ex; /archives//html/Amps/2005-07/msg00093.html (9,582 bytes)
12. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 11 Jul 2005 19:21:55 +0100; And the mains fuse protected the screen from what... and how? -- 73 from Ian G/GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2005-07/msg00090.html (7,640 bytes)
13. Re: [Amps] Watts unlimited SMPS solved (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 27 Jun 2005 18:17:31 +0100; So what was the problem? -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-06/msg00261.html (7,149 bytes)
14. Re: [Amps] watts unlimited smps (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 27 Jun 2005 00:12:15 +0100; I have the schematic here, and the grounding is not totally clear - there seem to be three different "ground" symbols used in various places. In different countries, those symbols could be interprete; /archives//html/Amps/2005-06/msg00252.html (8,450 bytes)
15. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sun, 26 Jun 2005 23:35:46 +0100; The point K5AND was making is that you don't needed a bleeder, so no power is wasted. When the amp is on (TX), the standing current in the PA tube brings the voltage down to the level where the regul; /archives//html/Amps/2005-06/msg00251.html (9,405 bytes)
16. Re: [Amps] Cheap network analyser on eBay (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sat, 25 Jun 2005 22:32:26 +0100; Oh no, it's a very clever device. The concept has been around for some time, but N2PK has really made it work. As for accuracy, comparisons with commercial VNAs run very close indeed. I'm not aware o; /archives//html/Amps/2005-06/msg00240.html (9,453 bytes)
17. Re: [Amps] Cheap network analyser on eBay (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sat, 25 Jun 2005 21:04:39 +0100; Just to be clear: the only thing that's "not simple" about the N2PK board is that it uses surface-mount components. That may be new to some people, but it really isn't hard. The payback is that there; /archives//html/Amps/2005-06/msg00234.html (8,372 bytes)
18. Re: [Amps] Fizzing From Amp (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Fri, 24 Jun 2005 09:20:56 +0100; Nicotine - or rather, the tar deposits - can be very bad for switches, variable capacitors and other contact surfaces. Amplifiers can be particularly bad, because the fan collects hours and years of; /archives//html/Amps/2005-06/msg00218.html (8,126 bytes)
19. Re: [Amps] GS35 QUESTION (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Sun, 12 Jun 2005 22:42:59 +0100; What's happening is that with the higher B+, the tube needs a higher bias voltage to cut it off. This voltage may be greater than the turn-on voltage of the VDRs, so some current will flow through th; /archives//html/Amps/2005-06/msg00080.html (7,917 bytes)
20. Re: [Amps] ACOM 2000A (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Thu, 9 Jun 2005 07:41:57 +0100; If one-half of your dipole falls down, the Acom 2000 will automatically re-tune and do its best to pump 2kW into this new "load". Better check your fire insurance :-) Seriously - a lovely amp. It ju; /archives//html/Amps/2005-06/msg00060.html (7,823 bytes)

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