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61. Re: [Amps] tube impedance, figuring tank circuit values (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Fri, 31 Mar 2006 16:42:15 +0000; Assuming you're making an adjustable matching network, you should be able to match a range of tube impedances while maintaining network Q within 12-15. Use your program to do some preliminary runs an; /archives//html/Amps/2006-03/msg00800.html (8,813 bytes)
62. Re: [Amps] rolling your own (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 04 Apr 2006 17:17:11 +0000; !!!!!!!!!! You gotta fix that stuck ! key. :) 73, Jim, KR1S http://kr1s.kearman.com/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2006-04/msg00049.html (7,509 bytes)
63. Re: [Amps] Rivet-nuts (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 05 Apr 2006 21:29:15 +0000; http://www.mcmaster.com/ 73, Jim, KR1S http://kr1s.kearman.com/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-04/msg00086.html (7,302 bytes)
64. Re: [Amps] Plate Impedance, ARRL (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 11 Apr 2006 21:04:01 +0000; My understanding is that this value of K applies to triodes, where Ep can swing nearly to zero. For tetrodes, Ep cannot swing below the screen voltage. IIRC, this has the effect of increasing K. It's; /archives//html/Amps/2006-04/msg00183.html (7,768 bytes)
65. Re: [Amps] Plate Impedance, ARRL (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 12 Apr 2006 16:38:44 +0000; Will, Amen, brother! I got my insight into the tetrode situation from Rich Measures' website, which I should have mentioned in my OP. Until they published (mangled) George Daughters' 4CX1600B amplifi; /archives//html/Amps/2006-04/msg00197.html (9,382 bytes)
66. Re: [Amps] Paypal only (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Thu, 13 Apr 2006 05:07:37 +0000; Will, Maybe, but the ones who really lose are the ones who don't take PayPal IMO. At least you have a prayer of getting your money back that way. I've been ripped off for hundreds of dollars through; /archives//html/Amps/2006-04/msg00211.html (8,400 bytes)
67. Re: [Amps] Chimney materials - Loss or not TSPA (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Fri, 14 Apr 2006 17:35:13 +0000; Why not Teflon? Thin sheet is not expensive and rolls nicely around the anode cooler. That's what I have for my amp. 73, Jim, KR1S http://kr1s.kearman.com/ ___________________________________________; /archives//html/Amps/2006-04/msg00253.html (7,879 bytes)
68. [Amps] AL-80B 10-meter Mod (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Mon, 24 Apr 2006 14:59:55 +0000; I came into an AL-80B this weekend, that doesn't have the 10-meter mod. I can wait to get the info from Ameritron but can anyone send it to me? You can verify that I am who I say I am by comparing my; /archives//html/Amps/2006-04/msg00359.html (6,628 bytes)
69. [Amps] New Elecraft Amps (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 25 Apr 2006 18:23:39 +0000; A friend forwarded this info, which appeared on the Elecraft and Ten-Tec lists. Get ready for "sticker shock." 73, Jim, KR1S http://kr1s.kearman.com/ _______________________________________________ A; /archives//html/Amps/2006-04/msg00374.html (9,071 bytes)
70. Re: [Amps] New Elecraft Amps (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 26 Apr 2006 16:42:25 +0000; The way I read it, you can build one amp _per model_ per year. 97.315 Certification of external RF power amplifiers (a) No more than 1 unit of 1 model of an external RF power amplifier capable of ope; /archives//html/Amps/2006-04/msg00386.html (8,235 bytes)
71. Re: [Amps] Plate Impedance, ARRL (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 26 Apr 2006 16:56:41 +0000; I suspect that when that section was written, the League was publishing only triode amplifiers. For many years until George Daughters published his 4CX1600B amplifier, all Handbook amps used triodes.; /archives//html/Amps/2006-04/msg00387.html (9,410 bytes)
72. Re: [Amps] Plate Impedance, ARRL (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 26 Apr 2006 18:56:19 +0000; Back in the day you could fit all current League publications on a small bookshelf. Starting in the 80s they went on a publishing bender, but didn't significantly increase the size of the editorial s; /archives//html/Amps/2006-04/msg00389.html (10,915 bytes)
73. Re: [Amps] Amp Faceplates (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Fri, 28 Apr 2006 12:50:41 +0000; Has anyone tried PhotoEZ, a silk-screen process that uses negatives produced on a laser printer? <http://www.ezscreenprint.com/> The high-res stuff looks perfect for panel lettering. 73, Jim, KR1S ht; /archives//html/Amps/2006-04/msg00416.html (6,830 bytes)
74. Re: [Amps] Amp Faceplates (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Fri, 28 Apr 2006 17:47:18 +0000; Thanks, Will. I was wondering if the silk mesh, especially the high-res stuff, might fill up with paint before you got a good covering. 73, Jim, KR1S http://kr1s.kearman.com/ ________________________; /archives//html/Amps/2006-04/msg00423.html (6,893 bytes)
75. [Amps] Diathermy machines (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 03 May 2006 13:04:51 +0000; A couple of weeks ago I had the chance to buy a diathermy machine for $10. The case was somewhat larger than a full-sized PC tower, and pretty heavy. I think it ran on 27 MHz. I let it go because I w; /archives//html/Amps/2006-05/msg00008.html (7,022 bytes)
76. Re: [Amps] Old amps are fun! (SB-221 smoke) (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Sun, 07 May 2006 21:03:21 +0000; If the 221 is similar to the 220 there is no dc voltage applied to the grids, so I would look for an internally shorted tube. The tubes are dc-isolated from each other, so the tube in that socket is; /archives//html/Amps/2006-05/msg00031.html (7,719 bytes)
77. Re: [Amps] How intermod limits your PEP (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 16 May 2006 17:08:27 +0000; Darwin was right! 73, Jim, KR1S http://kr1s.kearman.com/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-05/msg00116.html (7,619 bytes)
78. Re: [Amps] Henry 8K (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 16 May 2006 18:57:58 +0000; Just curious. Alpha rates the 87A as a "maximum legal power - locked key, no time limit" amplifier. How much bigger than that can you (legally) get? 73, Jim, KR1S http://kr1s.kearman.com/ ___________; /archives//html/Amps/2006-05/msg00124.html (7,769 bytes)
79. Re: [Amps] Henry 8K (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 16 May 2006 19:10:07 +0000; Maybe he plans to use the extra heat to keep the chickens warm? :) 73, Jim, KR1S http://kr1s.kearman.com/ _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2006-05/msg00127.html (7,325 bytes)
80. [Amps] Amps parts source (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Wed, 24 May 2006 18:30:09 +0000; While I was in the Dayton area I stopped at Midwest Surplus Electronics, in Fairborn. They have a good selection of parts of interest to amp builders, including metal and ceramic standoffs and other; /archives//html/Amps/2006-05/msg00342.html (7,151 bytes)

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