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81. [AMPS] IMD (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 17 Sep 2001 10:35:42 -0600; A reference to read about the development and testing of certain tetrodes specifically for better IMD is the September 1963 issue of QST, article by Bill Orr, W6SAI-SK. 73 John K5PRO -- -- FAQ on WWW; /archives//html/Amps/2001-09/msg00285.html (7,817 bytes)
82. [AMPS] another tube company in trouble (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 28 Sep 2001 08:37:43 -0600; Marconi PLC, owner of Marconi Applied Technologies, the maker of English Electric Valves, has gone from US $30 per share on NASDAQ market (09/25/00) to $0.50 per share today. We hope that the vacuum; /archives//html/Amps/2001-09/msg00467.html (6,728 bytes)
83. [AMPS] dielectrics (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 1 Aug 2001 08:14:26 -0600; Couldn't have said it better Tom, thanks for saying that. Before we all get to filling our variables with fluid. I don't know any dielectric that is better than air for loss tangent and for stability; /archives//html/Amps/2001-08/msg00004.html (7,445 bytes)
84. [AMPS] Tesla glass tube (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 2 Aug 2001 14:31:39 -0600; Has anybody had experience replacing 3-500Z zero bias triodes with Tesla RD 500A? They are from Prague, Czech Republic. http://www.electron-tubes.cz/products_f.html -- -- FAQ on WWW: http://www.conte; /archives//html/Amps/2001-08/msg00019.html (6,495 bytes)
85. [AMPS] 4-400A amplifiers (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sat, 25 Aug 2001 23:13:12 -0600; Tetrode amplifiers for SSB using 4-400A were popular in early 60's. They had a good following for high level AM, (used a the class C rf stage and the PP modulator) and Eimac wrote some very extensive; /archives//html/Amps/2001-08/msg00329.html (7,661 bytes)
86. [AMPS] Glitch protection relay (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 29 Aug 2001 08:49:23 -0600; 4 ms is like infinity for a power arc. This is shorter than one AC cycle, so if you can trip off the mains power this quickly you are doing good. But for the stored energy being released from the cap; /archives//html/Amps/2001-08/msg00361.html (10,591 bytes)
87. [AMPS] Glitch protection relay (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 29 Aug 2001 16:38:37 -0600; This note was sent with two JPEG files with photos, to 2 and W8JI. Here is plain copy. I can forward the photos upon request. -- I have inspected the insides of probably a dozen big tubes in my work,; /archives//html/Amps/2001-08/msg00374.html (10,718 bytes)
88. [AMPS] response on tube (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 30 Aug 2001 16:14:25 -0600; I was referring to approx. 20 kV plate voltage. With 1/2CV^2, the stored energy is large here. Hence the need for good crowbars. They protect 30 gauge wire fine when the are working. As for arcing in; /archives//html/Amps/2001-08/msg00390.html (8,298 bytes)
89. [AMPS] info on diode (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 31 Aug 2001 08:24:50 -0600; The Varo VC60X is a diode stick rated for 6 kV PRV, 1 Amp RMS, 35 Amp Surge. -- -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUES; /archives//html/Amps/2001-08/msg00393.html (6,176 bytes)
90. [AMPS] info on power supplies (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 12 Jul 2001 09:32:47 -0600; I'm building a 'retro' transmitter for high quality amplitude modulation. The RF part is to be a Johnson 500 (single 4-400A), and the power supplies, modulator and control relays are homebrew. To pay; /archives//html/Amps/2001-07/msg00154.html (8,512 bytes)
91. [AMPS] Why build high level AM? (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 13 Jul 2001 13:49:27 -0600; Using a 4 quadrant balanced modulator to create the AM signal does appeal in a simple way. It only requires a linear amplifier to follow it. In some of the small 20 watt carrier current AM transmitte; /archives//html/Amps/2001-07/msg00161.html (10,429 bytes)
92. [AMPS] close ratings (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 17 Jul 2001 08:32:21 -0600; The plate swing probably will be slightly less than the DC voltage, for a reasonable efficiency amplifier. Otherwise it will be even less and the amp will be underloaded. So figure that the voltage g; /archives//html/Amps/2001-07/msg00194.html (7,416 bytes)
93. [AMPS] info (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 10 Jun 2001 09:46:10 -0600; Thanks to Skipp for the Dayton Amp Vendors pics. Yes, they do all look sort of similar. Remember when they didn't? Thunderbolts, Warriors, Desk kW, SB220, 30L? Tetrodes, Triodes, all glass? -- I want; /archives//html/Amps/2001-06/msg00089.html (8,004 bytes)
94. [AMPS] looking for KW-1 (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 12 Jun 2001 10:39:27 -0600; I'm looking for a vintage-1960 Heathkit Chippewa, model KW-1, with power supply. Working or dead. 73 John K5PRO -- -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com A; /archives//html/Amps/2001-06/msg00107.html (6,397 bytes)
95. [AMPS] new article (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 20 Jun 2001 05:35:07 +0100; I just submitted a paper in the upcoming 2001 Particle Accelerator Conf. Proceeding (IEEE/APS) on the development of a 200 MHz 3.6 Megawatt RF amplifier, to operate up to 15% duty factor using the ne; /archives//html/Amps/2001-06/msg00182.html (6,995 bytes)
96. [AMPS] filament cutback (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 21 Jun 2001 05:28:02 +0100; In nearly every gridded tube we use, we practice filament voltage cutback to improve lifetime. I have to contradict the advice that only nonlinear class C FM amplifiers with overkill tubes should do; /archives//html/Amps/2001-06/msg00224.html (8,153 bytes)
97. [AMPS] notes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 25 Jun 2001 09:17:13 -0600; Its been mentioned several times before, but it deserves another reminder. We get more postings like this below (try and find the REAL message embedded in it, if you are using a normal text emailer l; /archives//html/Amps/2001-06/msg00276.html (14,348 bytes)
98. [AMPS] iron needed (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 29 Jun 2001 09:41:46 -0600; I already put this on the AM lists, but I got no bites. Maybe some amplifier builder has a stash of ancient iron.... I need a 500 Watt modulation transformer for a homebrew project. It should have ro; /archives//html/Amps/2001-06/msg00325.html (6,941 bytes)
99. [AMPS] tube info (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 9 May 2001 15:26:20 -0600; I was visiting Prague last week, and spent an afternoon in the Czech Technical Museum, which I believe was formerly a closed institution under the communist government. After spending a few hours wit; /archives//html/Amps/2001-05/msg00143.html (7,138 bytes)
100. [AMPS] another book about tube amplifiers (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 9 May 2001 15:38:24 -0600; POWER VACUUM TUBES HANDBOOK, Second Edition - 1999, by Jerry Whitaker, CRC Press, ISBN 0-8493-1345-7. It's not cheap, but maybe you can find it second hand. 710 pages, lots of recycled material from; /archives//html/Amps/2001-05/msg00144.html (7,578 bytes)

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