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41. Re: [Amps] Re Choke Formers.. (score: 1): Author: Larry <larry@w7iuv.com>; Date: Mon, 21 Jul 2008 07:57:13 -0700; The best way I've found to hold the wire ends is Scotch thermosetting glass tape. I forget the number offhand, but it should be easy to find. It also works real good for making chimneys with Teflon o; /archives//html/Amps/2008-07/msg00187.html (8,056 bytes)
42. Re: [Amps] GI-7b issues (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 09 Sep 2008 12:24:55 -0700; The cooling in those conversions is nowhere near enough. The GI-7B anode cooler is not very efficient. It cannot be properly cooled with a fan blowing at it. In order to realize any decent reliabilit; /archives//html/Amps/2008-09/msg00088.html (8,291 bytes)
43. Re: [Amps] Digital watt meters...HELP! (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 23 Sep 2008 17:21:51 -0700; I have an Array Solutions Power Master. It does everything I needed it to do and does it well. Jay at Array Solutions is knowledgeable and helpful. Their customer service seems very good at least so; /archives//html/Amps/2008-09/msg00196.html (7,170 bytes)
44. Re: [Amps] Non Detergent motor oil for dummy loads????? (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 05 Dec 2008 12:36:45 -0800; Since I went through this and did some research a few years back I'll jump in here. Most motor oils, including some so called "synthetics", and transmission fluids that I checked on, use sulfur compo; /archives//html/Amps/2008-12/msg00111.html (10,472 bytes)
45. [Amps] Some stuff for sale (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 17 Feb 2009 13:24:37 -0800; Time flies when you're having fun! It's hard to believe that I've been "collecting" parts for over 50 years now. However it's become painfully obvious that I'll never live long enough to finish all t; /archives//html/Amps/2009-02/msg00536.html (9,558 bytes)
46. Re: [Amps] Odd efficiency shift on 80m band (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 11 Mar 2009 15:47:00 -0700; Looks to me like you are running too much loading for the amount of drive. Do you have enough range on the load cap? I ran a few numbers and it looks like you would need at least 500 pF additional lo; /archives//html/Amps/2009-03/msg00329.html (8,563 bytes)
47. [Amps] HV switch-mode power supply (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 20 May 2009 14:45:37 -0700; The switch more power supply topic seems to pop up more frequently these days. It has always been of interest to me although I have not pursued any designs lately. Some 40+ years ago, I built switch; /archives//html/Amps/2009-05/msg00140.html (9,594 bytes)
48. Re: [Amps] HV switch-mode power supply (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 22 May 2009 10:02:31 -0700; Thanks to all that responded with info and ideas. All good stuff and things to think about. I am learning a lot from these discussions. However, there seems to be a trend towards "design excellence"; /archives//html/Amps/2009-05/msg00156.html (9,239 bytes)
49. Re: [Amps] LK500-ZB (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 09 Sep 2009 12:25:51 -0700; Gerald, Tried it a few times on 4-400A's. Sometimes it will clear, but always comes back. Didn't seem to be worth the effort to me, but might have been different if I had more than 5 bux invested in; /archives//html/Amps/2009-09/msg00129.html (9,103 bytes)
50. Re: [Amps] PEP Reading Wattmeter (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 01 Oct 2009 17:04:38 -0700; Check out the Array Solutions "Power Master". I'm happy with mine. Full power on all bands, no duty cycle limitations, even 6 meters. Larry - W7IUV DN07dg http://w7iuv.com ___________________________; /archives//html/Amps/2009-10/msg00011.html (8,141 bytes)
51. Re: [Amps] Stripline design (score: 1): Author: Larry <larry@w7iuv.com>; Date: Mon, 16 Nov 2009 10:26:23 -0800; Trying to copy a stripline design without copying it EXACTLY will usually lead to a lot of cut and try and quite possibly low efficiency. To design a stripline for any tube (or tubes), take the outpu; /archives//html/Amps/2009-11/msg00197.html (9,668 bytes)
52. Re: [Amps] (Perhaps) A plate choke too far ... (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 14 Jan 2010 10:12:42 -0800; Marv & all, Just some random thoughts which may or may not be appropriate/valid: Why 1-2 mH? Just curious because if I had a choke design that was 250-300 MICRO H and didn't have any resonances below; /archives//html/Amps/2010-01/msg00178.html (9,157 bytes)
53. Re: [Amps] HV Fuses (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 16 Feb 2010 17:11:23 -0800; Steve, amp supply. The object of the game is to EASILY fuse the wire, not wire your house with it. Fine wire sizes can be easily obtained by stripping a piece of common lamp cord. The fine strands ar; /archives//html/Amps/2010-02/msg00454.html (9,404 bytes)
54. Re: [Amps] Solid state relays and step start (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 04 Mar 2010 14:45:08 -0800; Gary, No problems here. Been using them in that application for more than 8 years now with no problems. I have a two-stage step start which has two series resistors. The SS relays (zero crossing) sho; /archives//html/Amps/2010-03/msg00083.html (8,421 bytes)
55. Re: [Amps] YC156 operating parms for US amp build? (score: 1): Author: Larry <larry@w7iuv.com>; Date: Mon, 29 Mar 2010 18:55:49 -0700; My YC-156 runs just fine with 3300 volts on the anode under load. At that level it will see 1500 out with about 40 watts of drive. I have the ZSAC set for approximately 200 ma. That's more than enoug; /archives//html/Amps/2010-03/msg00832.html (9,083 bytes)
56. [Amps] LCR meter & measuring components (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 31 Mar 2010 10:31:35 -0700; Here is my take on this business: Accurate measurements of L's and C's is as much "art" as science and that's the reason there are so much discussion about results. The "art" part comes into play whe; /archives//html/Amps/2010-03/msg00947.html (14,743 bytes)
57. [Amps] More LCR meters and measurements (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 01 Apr 2010 10:54:55 -0700; This has been an interesting thread. It would seem that most people have a "favorite" instrument for making these measurements. I guess I'm the odd man out here because I don't have a "favorite". I h; /archives//html/Amps/2010-04/msg00012.html (11,688 bytes)
58. Re: [Amps] More LCR meters and measurements. (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 02 Apr 2010 11:50:12 -0700; ** Agreed, no reason not to use the 875 or equivalent for this measurement. I have used my old homebrew C meter that tests at audio frequencies with success. Also used my MFJ successfully. throw away; /archives//html/Amps/2010-04/msg00024.html (13,300 bytes)
59. [Amps] liquid cooling (score: 1): Author: Larry <larry@w7iuv.com>; Date: Mon, 05 Apr 2010 09:06:52 -0700; The recent discussion on water cooling amp tubes got me thinking. Again. (not a good thing) Basically I would like to play with liquid cooling but I can't/won't use water. While I was still working,; /archives//html/Amps/2010-04/msg00095.html (8,966 bytes)
60. Re: [Amps] How to read the 3-500Z spec sheet? (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sun, 23 May 2010 11:35:51 -0700; Sorry Joe, but that is wrong. WSJT is *ONE TONE AT A TIME*. It can and does not only tolerate Class C amplifiers, but thrives on it! I run my 2x4CX250B's class C at 1100 watts output on 2 meter EME J; /archives//html/Amps/2010-05/msg00334.html (10,947 bytes)

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