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241. [Amps] 3cx800 tubes (score: 1): Author: Louis Parascondola via Amps <amps@contesting.com>; Date: Wed, 10 Feb 2016 09:13:51 -0500; Has anyone used 3cx800 tubes at 3200vdc plate voltage or a little higher? If so, what is the caveats if any and what was the duration of use? Thanks _______________________________________________ Am; /archives//html/Amps/2016-02/msg00040.html (6,533 bytes)
242. Re: [Amps] Ceramic tube temp too low? (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Mon, 14 Mar 2016 11:13:37 -0400; Hi Steve, Many water cooled GS35B amplifiers are in use, mostly on 70cm. Do a Google search for "water cooled GS35B" and a lot of information will come up. The temperature concern is a non issue as t; /archives//html/Amps/2016-03/msg00029.html (8,827 bytes)
243. Re: [Amps] WOW! (score: 1): Author: Dave W8NF via Amps <amps@contesting.com>; Date: Tue, 29 Mar 2016 12:35:13 -0700; A stunt is possibly being pulled. It's not obvious to me that the Hammond transformer in the foreground is connected to anything. Generally, on those larger glass tubes, getting a nice blue gas glow; /archives//html/Amps/2016-03/msg00050.html (7,882 bytes)
244. Re: [Amps] SB220 on 120V (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Tue, 5 Apr 2016 16:32:48 +0000 (UTC); Hi Dick, According to the SB220 schematic, each circuit breaker feeds one primary winding. IOW, just fine. The problem is, you need a STIFF 120V source to avoid dynamic instability of the HV. My SB22; /archives//html/Amps/2016-04/msg00004.html (8,000 bytes)
245. [Amps] Control transformers (score: 1): Author: Jeff Pederson via Amps <amps@contesting.com>; Date: Thu, 7 Apr 2016 15:41:09 +0000 (UTC); Good day, I have learned alot from this list over the years. What I propose to try may work or it wont. Im thinking it wont work but it dont hurt to ask. From time to time I come across 1kva,2kva,3kv; /archives//html/Amps/2016-04/msg00008.html (7,746 bytes)
246. Re: [Amps] Control transformers (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Sat, 9 Apr 2016 08:17:22 -0400; Jeff, I have not done that but conceptually it should work well. If you use two of the 3kva transformers, one would expect to generate enough d.c. to supply a 6 KW load. The voltage doubler will char; /archives//html/Amps/2016-04/msg00018.html (9,915 bytes)
247. Re: [Amps] warm up time for TX tubes (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Mon, 11 Apr 2016 14:38:58 -0400; John, the basic issue is that is unhealthy for the tube cathode to be subjected to current flow before it has reached the proper operating temperature. If the tube has cutoff bias voltage applied the; /archives//html/Amps/2016-04/msg00021.html (9,559 bytes)
248. Re: [Amps] Dual 3-1000Z amp problem (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Tue, 19 Apr 2016 15:23:05 -0400; You are retuning the plate circuit to match the new lower plate load Z, right? If you are, you might try a different watt meter. 73, Gerald K5GW In a message dated 4/19/2016 2:17:45 P.M. Central Dayl; /archives//html/Amps/2016-04/msg00030.html (8,847 bytes)
249. [Amps] Dentron MLA 2500 choke value (score: 1): Author: Jeff Pederson via Amps <amps@contesting.com>; Date: Wed, 20 Apr 2016 19:37:35 +0000 (UTC); I recently purchased a Dentron MLA 2500 for a conversion project. I installed the Harbach boards that Jeff offers and added a soft start. On board PC-1004 I found a fried choke. It is RFC 4 and looks; /archives//html/Amps/2016-04/msg00038.html (7,451 bytes)
250. Re: [Amps] 8877 heater inrush (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Wed, 27 Apr 2016 17:19:24 +0000 (UTC); Hi Alan, Here is my solution to that: http://qsl.net/wc6w/wc6wamps/index.html?fr63.html 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ Subject: [Amps] 8877 heater inrush To: amps@contesting.com Da; /archives//html/Amps/2016-04/msg00051.html (9,286 bytes)
251. [Amps] Misc. PA-77 questions (score: 1): Author: Scott via Amps <amps@contesting.com>; Date: Fri, 29 Apr 2016 22:33:22 -0400; HI. I recently acquired a nice old PA-77, which seems to be working well, but have a few questions, if anyone could help out I'd appreciate it. 1) The amp appears to have been modified for 160, and w; /archives//html/Amps/2016-04/msg00052.html (7,502 bytes)
252. [Amps] Plate transformers (score: 1): Author: Jeff Pederson via Amps <amps@contesting.com>; Date: Fri, 20 May 2016 17:55:56 +0000 (UTC); I have located the following transformers. My guess is they are designed for choke input not sure if suitable for capacitor input. The first transformer is 40lbs and that seems heavy for 270ma. The p; /archives//html/Amps/2016-05/msg00032.html (7,670 bytes)
253. [Amps] UK Amp Challenger 2 (score: 1): Author: John Randall via Amps <amps@contesting.com>; Date: Wed, 1 Jun 2016 18:05:17 +0000 (UTC); Ever since I got this amp, it has never worked on top band. The amp has a pair of 3cx800a7 tubes in it and was modified from a single bander to 160m to 10m all included.I have calculated that the 160; /archives//html/Amps/2016-06/msg00003.html (7,519 bytes)
254. [Amps] Re challenger 2 amp (score: 1): Author: John Randall via Amps <amps@contesting.com>; Date: Fri, 3 Jun 2016 16:52:22 +0000 (UTC); I am pleased to say that I found the fault after dropping the front panel and using a mirror to see behind the 160m coil. I found that the turns had dropped around the back and were not next to each; /archives//html/Amps/2016-06/msg00009.html (7,823 bytes)
255. Re: [Amps] Tube Tester (score: 1): Author: mike via Amps <amps@contesting.com>; Date: Fri, 10 Jun 2016 10:22:51 -0400; Yes, I have had tubes checked by him. Mike --Original Message-- From: Joe <nss@mwt.net> To: Amps group <amps@contesting.com> Sent: Fri, Jun 10, 2016 10:03 am Subject: [Amps] Tube Tester Greetings Eve; /archives//html/Amps/2016-06/msg00019.html (7,980 bytes)
256. Re: [Amps] Tube Tester (score: 1): Author: Scott via Amps <amps@contesting.com>; Date: Fri, 10 Jun 2016 10:38:01 -0400; Hi Joe, I have used them this year to test a few 8874s and 3cx800's and found them to be quick, reliable, and the results generally consistent with what I already knew or was told about the tubes, an; /archives//html/Amps/2016-06/msg00020.html (8,251 bytes)
257. [Amps] FS: Tubes & Sockets (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Fri, 10 Jun 2016 17:18:28 +0000 (UTC); A few Eimac tubes. Many Johnson sockets 122-101, 122-105, 122-116, 122-237, 122-244, 122-247 and a few Eimac sockets. Sk600, SK610, SK630A, SK710 I don't charge for packing, handling or "separate fee; /archives//html/Amps/2016-06/msg00023.html (7,047 bytes)
258. Re: [Amps] Tube Test (score: 1): Author: Robert Dorchuck W6VY via Amps <amps@contesting.com>; Date: Fri, 10 Jun 2016 17:29:43 +0000 (UTC); I have used them also. Seem to do a good job. They are now part of Richardson Electronics. Bob W6VY From: Joe <nss@mwt.net> To: Amps group <amps@contesting.com> Sent: Sunday, June 5, 2016 6:17 AM S; /archives//html/Amps/2016-06/msg00024.html (8,521 bytes)
259. Re: [Amps] 3-500Z tube problems (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Mon, 13 Jun 2016 19:00:51 +0000 (UTC); Vic, 1986 to 1989. See http://lists.contesting.com/_amps/2014-04/msg00255.html. Someone with the callsign "K2VCO" asked that question. Maybe you know him? ;-) vy 73, Bryan WA7PRC Date: Mon, 13 Jun 20; /archives//html/Amps/2016-06/msg00042.html (9,644 bytes)
260. [Amps] FS: Air Variable Capacitors (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Thu, 16 Jun 2016 16:31:59 +0000 (UTC); Heavy Duty Load Capacitor 50-1700pF measured. This unit has contoured .030 thick plates with .030 air gaps for increased resolution at low settings (straight line frequency). Thick cast Aluminum f; /archives//html/Amps/2016-06/msg00064.html (8,146 bytes)

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