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1. [Amps] Source wanted for HV switch-mode power supply (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Tue, 19 May 2009 15:40:43 -0500; (maiden post here) I've just got a Burle 8791, socket, chimney, and whatnot, and am looking hard at building an amp. Does anyone know a good source for a suitable switch-mode power supply -- 2500 V D; /archives//html/Amps/2009-05/msg00127.html (7,103 bytes)
2. Re: [Amps] Source wanted for HV switch-mode power supply (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Wed, 20 May 2009 15:09:40 -0500; <HAND WAVING WILDLY IN THE AIR!!!!!!!!!!!!!> -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2009-05/msg00137.html (8,155 bytes)
3. Re: [Amps] HV switch-mode power supply (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Fri, 22 May 2009 19:29:31 -0500; [snip other stuff] I'm in this to learn. I know how to build a linear supply; I probably could do it in my sleep, and I'm pretty sure I'm not the only one. I'm also not getting younger, and really am; /archives//html/Amps/2009-05/msg00158.html (11,823 bytes)
4. Re: [Amps] silver epoxy... (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Wed, 27 May 2009 10:59:04 -0500; Do you have a way to bring that end of the device, or the whole thing, up to soldering temperature and then to do a controlled cool-down? 550 to 650 degrees ought to do it, and most gas ovens will ge; /archives//html/Amps/2009-05/msg00208.html (8,039 bytes)
5. [Amps] Amp design tutorial online? (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Wed, 27 May 2009 13:35:03 -0500; Does anyone have pointers to online tutorial material for RF power amp design, with formulas, guides to using manufacturer's performance curves, and the like? I have found sources for some of this, b; /archives//html/Amps/2009-05/msg00211.html (6,470 bytes)
6. Re: [Amps] Talk about a rough life! (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Tue, 14 Jul 2009 06:37:55 -0500; Well, go ahead and buy it, then send it to me for cleanup. I'm good in QRZ. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin _______________________________________________ Amps mailing l; /archives//html/Amps/2009-07/msg00196.html (7,881 bytes)
7. 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)
8. [Amps] custom sockets (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Fri, 24 Jul 2009 10:15:41 -0500; Would you mind posting the information again, Jim? I don't find it in the archives; maybe I'm not holding my mouth right. Thanks. -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin ________; /archives//html/Amps/2009-07/msg00322.html (6,826 bytes)
9. Re: [Amps] Eimac AS newsletters (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Fri, 31 Jul 2009 06:44:09 -0500; If you'll scan it and E-mail it to me, I'll put it up on my website <http://mikea.ath.cx/>. Thanks! -- Mike Andrews, W5EGO mikea@mikea.ath.cx Tired old sysadmin ______________________________________; /archives//html/Amps/2009-07/msg00430.html (7,251 bytes)
10. Re: [Amps] Cleaning Cigarette tar....? (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Fri, 31 Jul 2009 18:42:08 -0500; The only caveat I'd put on the above is that I have seen 409 eat epoxy paint very slightly (on military comms gear, back in 1970). I don't know if the formulation has changed, and haven't had contact; /archives//html/Amps/2009-07/msg00453.html (7,944 bytes)
11. Re: [Amps] plate bypass capacitor (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Mon, 10 Aug 2009 14:14:19 -0500; BoatAnchor: heavy, bulky, hard to move, "portable" in the "has handles" sense. Think R-390 or just about any of the military transmitters before 1975. 73, de -- Mike Andrews, W5EGO mikea@mikea.ath.cx; /archives//html/Amps/2009-08/msg00244.html (8,339 bytes)
12. Re: [Amps] Carbon Resistor Substitution (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Thu, 3 Sep 2009 10:37:34 -0500; Vishay/Sfernice thick film power resistors page 527 LTO 30 and LTO 50: 30 and 50 watt TO-220 package LTO 100: 100 watt TO-247 package Affordable Ohmite TAP series heat-sinkable low inductance and cap; /archives//html/Amps/2009-09/msg00023.html (8,359 bytes)
13. Re: [Amps] LK500-ZB (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Fri, 11 Sep 2009 08:22:19 -0500; It's good that you're able to move the trouble with the tube. First, ohm the tube out, each pin and the plate cap to each other pin and the plate cap; record the results -- or have someone else recor; /archives//html/Amps/2009-09/msg00150.html (9,331 bytes)
14. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Tue, 15 Sep 2009 14:07:18 -0500; A small variac off the power line into the filament transformer? May cost as much as $50, but that's cheap compared to a pair of 3-500Z. You could stick an AC voltmeter across the filaments, too, and; /archives//html/Amps/2009-09/msg00206.html (8,519 bytes)
15. Re: [Amps] Amplifier scenario question (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Thu, 17 Sep 2009 05:51:41 -0500; If it's a triode, or if it's a tetrode with screen voltage derived from the plate supply, you're OK. If it's a tetrode and the screen voltage stays on even after plate HV drops, the screen starts act; /archives//html/Amps/2009-09/msg00228.html (7,060 bytes)
16. Re: [Amps] Sunspots gone? (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Thu, 24 Sep 2009 06:40:28 -0500; I've seen a fair quantity of Amps list trafic since the beginning of 22 Sep. It's not dead. Sunspots, now ... there are some astrophysicists saying that we won't be seeing sunspots again for a long t; /archives//html/Amps/2009-09/msg00275.html (7,300 bytes)
17. [Amps] Parasitics can kill (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Tue, 29 Sep 2009 21:13:59 -0500; It's not just RF power amps that have parasitics, and sometimes they can cause people to die. The Association for Computing Machinery's newsgroup on the risks associated with computing and electronic; /archives//html/Amps/2009-09/msg00363.html (8,600 bytes)
18. Re: [Amps] LK-500-NTC v. SB-220 v. Clipperrton L (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Mon, 5 Oct 2009 15:11:08 -0500; At least ten years older than my age when the question was most recently posed. I just turned 63; I'm middle-aged. MIDDLE-AGED, DAMNIT! YOU ALL GOT THAT? I will admit that for a while I was a young f; /archives//html/Amps/2009-10/msg00101.html (9,191 bytes)
19. Re: [Amps] Eimac tube on the 'bay (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Tue, 13 Oct 2009 09:39:09 -0500; You'll have _lots_ of grunt. The currents add, so you'll have 4.5A into the rectifiers. That's a really spicy meatball there, OM. I droool. Of course, that ass-u-me-s that you have 3-phase going in.; /archives//html/Amps/2009-10/msg00193.html (9,463 bytes)
20. Re: [Amps] Peter Dahl XFMR question (I Have one!) (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Mon, 19 Oct 2009 08:33:48 -0500; What's the model number? It may still be on the Harbach/Dahl site. It'd be really good for building an amp that could loaf right along at full legal limit in any mode. -- Mike Andrews, W5EGO mikea@mi; /archives//html/Amps/2009-10/msg00255.html (7,979 bytes)

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