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References: [ +from:cw_de_n5op@sbcglobal.net: 102 ]

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1. Re: [Amps] Incandescent and tube filaments tspa (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 14 Feb 2007 13:09:34 -0800 (PST); John, you get to play with some of the *neatest* stuff! My Dad has some books on vacuum tube design and characteristics. One is by Spangenberg and he has two others (can't recall the author). I was r; /archives//html/Amps/2007-02/msg00246.html (7,952 bytes)
2. [Amps] ML!-2500 Filter Cap Replacement (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 18 Feb 2007 20:45:20 -0600; I have my Dad's MLA-2500 in my shack for what I suspect is a filter capacitor replacement job. It hadn't been operated in a long time and Dad wanted me to check everything out (he's had health proble; /archives//html/Amps/2007-02/msg00289.html (7,191 bytes)
3. Re: [Amps] ML!-2500 Filter Cap Replacement (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 19 Feb 2007 06:52:04 -0800 (PST); Thanks, Tom. Yes, there are carbon comp resistors across the caps and I plan to replace those with metal film; I'll look for carbon comp resistors across the rectifiers and pull them. The story I rea; /archives//html/Amps/2007-02/msg00295.html (10,227 bytes)
4. Re: [Amps] ML!-2500 Filter Cap Replacement (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 19 Feb 2007 06:54:53 -0800 (PST); Oh, good! Thanks, Robert. Now, I gotta figure out how to insure that metal chips don't wind up where they mustn't be. A vacuum cleaner right at the drill should help a lot. Happy QRO, Kim, N5OP Yeah,; /archives//html/Amps/2007-02/msg00296.html (9,063 bytes)
5. [Amps] Weird Problem (what problem isn't?) (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 21 Feb 2007 09:59:41 -0800 (PST); I have an early AL-80A (S/N 095) with a power supply that I modified for another 1000 v of B+. I did that over ten years ago and all was well. However, I've moved a couple of times since then and cha; /archives//html/Amps/2007-02/msg00347.html (9,787 bytes)
6. [Amps] MLA-2500 Bandswitch Arc (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 25 Feb 2007 21:32:20 -0600; As I've been working on my Dad's MLA-2500 (not the B model), I've noticed that at some point in time, there must have been an arc between the 10 m coil tap contact and the adjacent ground contact. Fo; /archives//html/Amps/2007-02/msg00390.html (6,911 bytes)
7. [Amps] Old POwer Cord (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sat, 03 Mar 2007 22:07:12 -0600; I've been repairing my Dad's MLA-2500. It started with bad filter capacitors, but then I decided it really needed a step-start circuit. In adding that, I had to alter toe mains connection. The cord i; /archives//html/Amps/2007-03/msg00044.html (7,228 bytes)
8. Re: [Amps] Old Power Cord (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 04 Mar 2007 13:50:34 -0600; Thanks, Hal! Nothing in the amp depends on 120 VAC return path to neutral (I double checked). I used 3-conductor SJOOW "water resistant" wire, 16-3. It says it's rated to 300 V, not 600 V, which was; /archives//html/Amps/2007-03/msg00060.html (9,282 bytes)
9. [Amps] MLA-2500 Complete (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 04 Mar 2007 14:24:52 -0600; I've finished the filter capacitor replacement in my Dad's MLA-2500. I also added a step-start, a new power cord (surprise!), and did some serious cleaning of the band switch. In doing the latter, I; /archives//html/Amps/2007-03/msg00062.html (8,659 bytes)
10. Re: [Amps] Old Power Cord (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 5 Mar 2007 13:51:03 -0800 (PST); Yep, I've been informed that what I've done isn't such a Good Thing and I've performed a naive (not to code) fix. Among the problems I now face is distance: one antenna (a vertical dipole) is about 3; /archives//html/Amps/2007-03/msg00088.html (10,774 bytes)
11. Re: [Amps] rfi (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 01 May 2007 21:49:32 -0500; OK, here's my story. When I was in Colorado, I had a ne'er do well neighbor behind me. This guy had been a bit of a jerk in many different ways and he once came over to my place with some "muscle" in; /archives//html/Amps/2007-05/msg00014.html (9,066 bytes)
12. Re: [Amps] MLA-2500 (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Fri, 25 Jan 2008 09:01:57 -0800 (PST); My Dad had an MLA-2500. I recall that we had to add some fixed C-load for it to load properly on 160 m; even at that, it didn't do well below about 1.85 MHz or so. It was also not very efficient on 1; /archives//html/Amps/2008-01/msg00179.html (10,732 bytes)
13. Re: [Amps] MLA-2500 (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Fri, 25 Jan 2008 11:49:09 -0800 (PST); I should have added to my post that, when tuned into a 50 ohm resistive load, I never saw the kind of behavior reported here with the load cap. It pretty much tuned by the book. Something isn't right; /archives//html/Amps/2008-01/msg00188.html (11,424 bytes)
14. [Amps] Input Impedance of GG vs B+ (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 28 Feb 2008 09:26:54 -0800 (PST); I'm curious about how input impedance of a GG am changes as a function of B+ supply. I have a single 3-500Z GG amp for which I can't seem to get as good a match as I expected when adjusting the input; /archives//html/Amps/2008-02/msg00207.html (6,704 bytes)
15. Re: [Amps] Relays (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 31 Mar 2008 19:57:46 -0500; All this talk about relays and QSK has me wondering why aren't PIN diodes used more commonly? Then I began to read about some of the atrocious swtiching that goes on with some rigs. I have an AL-80A; /archives//html/Amps/2008-03/msg00396.html (8,204 bytes)
16. Re: [Amps] Relays (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 01 Apr 2008 20:47:30 -0500; Thanks, Vic! Makes perfect sense. Yes, the PIN diodes are quite expensive, especially for ones capable of handling much power. 73, _______________________________________________ Amps mailing list Am; /archives//html/Amps/2008-04/msg00027.html (8,064 bytes)
17. Re: [Amps] AL-82 (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 15 Sep 2008 20:46:02 -0500; I don't own an AL-82 but I do own an AL-80A that I modified for about 3800 V idling and about 3600 V full-load Doing this reduced the drive requirements a bit and increased the output a bit less than; /archives//html/Amps/2008-09/msg00148.html (8,809 bytes)
18. [Amps] Internal QSK-5 (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sat, 31 Jan 2009 19:55:14 -0600; I have an AL80A with an internal QSK 5 switch (one of the early ones) that I've had since new (S/N 095). For well over 20 years, it's been working flawlessly. Recently, though, I had some 160 m anten; /archives//html/Amps/2009-01/msg00380.html (7,154 bytes)
19. Re: [Amps] Internal QSK-5 (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 01 Feb 2009 10:06:44 -0600; Thanks, Phil! What I have is a very early PIN-5 switch (S/N 0018). I understand that this evolved into the QSK-5, but I don't know what the differences are. As this is an early model, I haven't much; /archives//html/Amps/2009-02/msg00004.html (10,220 bytes)
20. Re: [Amps] Internal QSK-5 (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 01 Feb 2009 10:16:31 -0600; Thanks, Joe! I stand corrected, especially after I renewed my memory looking at the docs I have. This is an early PIN-5 switch (S/N 0018) and it came with minimal documentation. Do you know what the; /archives//html/Amps/2009-02/msg00005.html (11,710 bytes)

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