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1. [Amps] GI7B cathode impedance (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 12 May 2006 07:14:54 -0700; Can anyone tell me what the approximate cathode impedance might be for a GI7B in grounded grid on 432 MHz? I've searched the archives and the usual web resources and come up with nothing useful. Than; /archives//html/Amps/2006-05/msg00088.html (6,240 bytes)
2. Re: [Amps] 813's (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sun, 28 May 2006 15:40:31 -0700; Carl, The 813 cathode impedance when run G-G with 2500 volts on the anode and at least 200 ma. anode current will be on the order of 270 ohms. If you push the tube hard it will be slightly lower. 73,; /archives//html/Amps/2006-05/msg00460.html (7,981 bytes)
3. [Amps] GI7B amp (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 30 May 2006 07:36:53 -0700; Anyone out there constructed and operated an amplifier using GI7B tubes? Please email me directly if you would like to share your experience. Thanks. 73, Larry -- Larry - W7IUV DN07dg http://w7iuv.co; /archives//html/Amps/2006-05/msg00508.html (6,068 bytes)
4. [Amps] 4CX1600B (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sat, 29 Jul 2006 08:52:47 -0700; Some time back, I acquired a Svetlana 4CX1600B and matching socket with the intention of building a six meter amp. I'm about to start that project now. Recently several folks have suggested that I wo; /archives//html/Amps/2006-07/msg01309.html (6,649 bytes)
5. [Amps] GS-35B on 6 meters (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 04 Aug 2006 10:07:56 -0700; What kind of gain can I reasonably expect from a GS-35B on 6 meters at anode voltages less then 4 KV? The info I have found on the web is sketchy and inconsistant. Most builders seem to avoid the iss; /archives//html/Amps/2006-08/msg00144.html (6,553 bytes)
6. Re: [Amps] 3CX800A7 Orientation (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 16 Aug 2006 13:31:38 -0700; Bob, My Eimac data sheet for the 3CX800A7 (dated 1 Dec 83) on page 3, mechanical: "The tube may be mounted in any position. If it is operated in an inverted (anode down) or horizontal position the SK; /archives//html/Amps/2006-08/msg00519.html (7,392 bytes)
7. [Amps] Bad GS35 (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 06 Sep 2006 14:59:05 -0700; Anybody have a bad GS35B? I need a couple for some mechanical mock-ups I'm working on. Stateside preferably to keep shipping cost down. Thanks, Larry -- Larry - W7IUV DN07dg http://w7iuv.com ________; /archives//html/Amps/2006-09/msg00132.html (6,470 bytes)
8. [Amps] Bird 43 meter (score: 1): Author: Larry <larry@w7iuv.com>; Date: Mon, 18 Sep 2006 15:14:47 -0700; Can anyone tell me what the resistance is of the 30 microamp meter movement in a Bird 43 wattmeter? Thanks, Larry -- Larry - W7IUV DN07dg http://w7iuv.com ____________________________________________; /archives//html/Amps/2006-09/msg00216.html (6,290 bytes)
9. Re: [Amps] Bird 43 meter (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 19 Sep 2006 19:04:58 -0700; Thanks to all that responded to my request for help. Looks like there is some variation, but 1350 ohms seems like it is pretty close to the average. 73, Larry Larry - W7IUV DN07dg http://w7iuv.com __; /archives//html/Amps/2006-09/msg00236.html (7,035 bytes)
10. [Amps] Bad tubes from Ebay (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 28 Sep 2006 11:44:20 -0700; Recent purchases of russian tubes from Ebay sellers have been pretty disappointing with more than 50% DOA's. A summary of my experience is at: http://w7iuv.com/badtubes.html And yes, I did try to "co; /archives//html/Amps/2006-09/msg00341.html (6,448 bytes)
11. [Amps] Bad tubes and bad shipping (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 29 Sep 2006 08:19:57 -0700; My post concerning bad tubes generated some responses that would put the blame on the entity doing the transportation. I personally don't believe that's the case. The majority of tubes in question we; /archives//html/Amps/2006-09/msg00357.html (7,810 bytes)
12. [Amps] Bad tubes from ebay, update (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sat, 27 Jan 2007 13:16:30 -0800; Several months ago I posted a note about my experiences buying tubes from east European sellers on ebay. Some of the details are at http://w7iuv.com/badtubes.html The problems with the seller "exland; /archives//html/Amps/2007-01/msg00271.html (7,381 bytes)
13. [Amps] test - sorry (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 09 Feb 2007 07:25:13 -0800; My post keep getting bounced by the list robot. The list administrator has declined to answer my requests for assistance and so I'm forced to annoy everyone while I try to figure out what's wrong. My; /archives//html/Amps/2007-02/msg00161.html (6,233 bytes)
14. Re: [Amps] General question on filament life (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 09 Feb 2007 07:59:47 -0800; Maybe I've got my list "bounce" problem fixed..... Around 1970 I put together an amp with a pair of Penta Labs used 4-400A's. Around 1988 or so one of the tubes failed due to a filament to cathode sh; /archives//html/Amps/2007-02/msg00162.html (11,210 bytes)
15. Re: [Amps] Thoriated tungsten lifetime when idling tspa (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 09 Feb 2007 15:48:26 -0800; I would love to hear the theory behind that and John and all, I wish I could provide more background. It's been a lot of years and at the time I was still in my "cowboy" era where I only cared about; /archives//html/Amps/2007-02/msg00170.html (8,569 bytes)
16. Re: [Amps] General question on filament life (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 09 Feb 2007 19:52:15 -0800; Yeah Dave, good catch! Please excuse my typo. My brain said grid, my fingers typed cathode. It seems like I spend twice as much time correcting as I do typing these days. Chalk it up to old age. 73,; /archives//html/Amps/2007-02/msg00174.html (8,353 bytes)
17. [Amps] Edge wound inductors (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 27 Feb 2007 16:04:57 -0800; OK guys, help me out here. I just don't see the advantage of using these edge wound inductors. I have several and have measured their Q. The measured Q does not impress me as it was about the same as; /archives//html/Amps/2007-02/msg00410.html (7,529 bytes)
18. Re: [Amps] Edge wound inductors (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 28 Feb 2007 08:04:22 -0800; I don't see the tap advantage. If a round conductor coil is wound and supported in a similar manner, then the same type of clamps can be used. I have some of these made for standard coils and they wo; /archives//html/Amps/2007-02/msg00414.html (10,894 bytes)
19. Re: [Amps] Surface Cleaning Tarnished Aluminum (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 24 Apr 2007 10:18:08 -0700; I gotta jump in here. Lye, if used with a bit of intelligence, does not "dissolve" aluminum. At least not any more then you would want to in the first place. I use the stuff all the time on aluminum; /archives//html/Amps/2007-04/msg00253.html (9,585 bytes)
20. Re: [Amps] LYE (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 24 Apr 2007 10:54:15 -0700; Wow, Bob, I can't imagine what the concentration of that solution might be. No matter what I do here, I can't get it to "bubble away" aluminum. Could it be accelerated by the presence of steel? An el; /archives//html/Amps/2007-04/msg00257.html (7,116 bytes)

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