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281. Re: [Amps] Silver epoxy yes (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 29 May 2009 21:06:40 -0400; That's what I get for researching controversial subjects<:-)) I find paid think tanks spreading disinformation on some subjects. That makes it difficult to argue when some one sees a PHD arguing for; /archives//html/Amps/2009-05/msg00267.html (16,809 bytes)
282. Re: [Amps] Meter shunt (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 29 May 2009 21:13:50 -0400; It's almost a necessity as many meters have internal shunts and that's when you end up with those super low calculated external shunt values. At work we had a number of feed back sensors in SCR contr; /archives//html/Amps/2009-05/msg00268.html (9,368 bytes)
283. Re: [Amps] 8874? (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 01 Jul 2009 04:21:07 -0400; The DTR-2000 used a single 8877/3CX1500A7 which is much larger physically than the 8874. I was getting 8877s at the time for $305 (at a discount)and had a number of them (when the DTR2000 first came; /archives//html/Amps/2009-07/msg00000.html (10,330 bytes)
284. Re: [Amps] 8874? (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 01 Jul 2009 15:06:51 -0400; Thanks for the correction. My mind did a transposition there. <:-)) When I woke this afternoon I was wondering if I'd gotten that straight and the first e-mail I saw answered my question. The 8873 wa; /archives//html/Amps/2009-07/msg00018.html (13,989 bytes)
285. Re: [Amps] 8874? (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 01 Jul 2009 15:57:09 -0400; Some where out there is an SB230 with two 8873s. I had one. <:-)) Of course some one could have just added a second tube, but it looked like it belonged there. OTOH I also had a solid state, 101 tran; /archives//html/Amps/2009-07/msg00022.html (17,356 bytes)
286. Re: [Amps] Sweep tube amp (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 02 Jul 2009 22:05:35 -0400; 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00074.html (13,131 bytes)
287. Re: [Amps] 6 Meter Amplifier (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 12 Jul 2009 19:52:37 -0400; Nice looking piece of work Carl 73, Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00166.html (9,131 bytes)
288. Re: [Amps] Tube choice for SB-200 on 6 meters (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 12 Jul 2009 20:02:10 -0400; I used to *run* the 3-500s in my 2K4 that way. Never had one fail. That was with about 1200 out. The original transformer had been replaced with a Peter Dahal, but I don't know why if spending that m; /archives//html/Amps/2009-07/msg00168.html (18,049 bytes)
289. Re: [Amps] 6 Meter Amplifier (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 12 Jul 2009 20:37:44 -0400; Just go to e-bay and search on SB-221 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00169.html (8,929 bytes)
290. [Amps] Tubes in Alphas (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 12 Jul 2009 22:18:55 -0400; I'm wondering what the reasoning behind Alpha using different tubes in the manual and auto tune versions of their amps. They are now using different tubes in the manual tune and auto tune versions. T; /archives//html/Amps/2009-07/msg00171.html (6,566 bytes)
291. [Amps] Talk about a rough life! (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Mon, 13 Jul 2009 09:44:19 -0400; Now here's a real beauty. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320397697634&ssPageName=ADME:B:SS:US:1123 73 Roger (K8RI) _______________________________________________ Amps mailing lis; /archives//html/Amps/2009-07/msg00177.html (6,704 bytes)
292. Re: [Amps] Talk about a rough life! (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Mon, 13 Jul 2009 16:48:49 -0400; Looks like a fair amount of copper is missing from some of those fins. OTOH it might clean up reasonably well. Let me know how it comes out<:-)) 73 Roger (K8RI) ______________________________________; /archives//html/Amps/2009-07/msg00186.html (9,336 bytes)
293. Re: [Amps] Grounded Grid (Screen) 4CX250B power gain (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Tue, 21 Jul 2009 18:40:09 -0400; Yah can't get much less than zero<:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00251.html (13,545 bytes)
294. Re: [Amps] Grounded Grid (Screen) 4CX250B power gain (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 22 Jul 2009 01:15:00 -0400; That seems strange as the grid is rated at zero watts dissipation. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma; /archives//html/Amps/2009-07/msg00268.html (10,486 bytes)
295. Re: [Amps] inexpensive HV fuse (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 22 Jul 2009 03:40:52 -0400; This sounds good, but "I think" (not having tried it) that the bronze spring would lose its temper before the wire burned through leaving a rather limp wick. Most fuses have a much thinner portion fo; /archives//html/Amps/2009-07/msg00273.html (11,834 bytes)
296. Re: [Amps] inexpensive HV fuse (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 22 Jul 2009 21:00:22 -0400; Get someone to stand next to it, that has never had the honor of seeing how fast a crowbar can work.<:-)) Of course the Varistor route is also spectacular when dumping 50,000 joules off a 480 primary; /archives//html/Amps/2009-07/msg00294.html (11,833 bytes)
297. Re: [Amps] EIMAC 4CX300A 8167 (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 23 Jul 2009 21:37:45 -0400; Hallicrafters HT-33 puts out 625 watts from a pair of them with 8 watts of drive according the the manual. Do you have a pair with sockets and spares? They use a similar, but much smaller version sim; /archives//html/Amps/2009-07/msg00320.html (7,517 bytes)
298. Re: [Amps] grounded grid 813 x4 (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Mon, 27 Jul 2009 22:03:31 -0400; I built up one of the single band 813 GG amps out of QST back in the 60's, added a B&W850 band switch and was on 80-10. IIRC I did the same as Carl, but with 2 tubes. I don't remember what I had on t; /archives//html/Amps/2009-07/msg00346.html (8,940 bytes)
299. Re: [Amps] Dummy Load "Oil" (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Wed, 29 Jul 2009 18:48:05 -0400; Almost anything will work as long as it's not flamable at the temperatures we'd normally run a dummy load. Then some fluids smell and are best avoided. David pretty well covered it. The Handbook quot; /archives//html/Amps/2009-07/msg00371.html (12,007 bytes)
300. Re: [Amps] Dummy load oil (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 30 Jul 2009 00:47:18 -0400; Note the "cantenna" and others that are oil filled normally have a vent with just a plastic cap over them. Man, if yah gotta use a horse laxative it's time to see a doctor! ... and don't sneeze. For; /archives//html/Amps/2009-07/msg00392.html (9,150 bytes)

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