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References: [ +from:jtml@lanl.gov: 562 ]

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161. [AMPS] radio may be bad for you (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 16 Feb 2000 14:17:01 -0700; I saw this in an advertisement in a broadcast mag, Radio World. Electro-K offers X-ion, a device that promises to protect against positive ion generators by neutralizing Electro-Magnetic Fields, the; /archives//html/Amps/2000-02/msg00290.html (7,604 bytes)
162. [AMPS] fil info (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 23 Feb 2000 08:15:52 -0700; The commercial FM B'dcast xmitters that I designed in the period of 1980-85 and those of several competitors used special filament transformers, which would limit inrush to 2 X nominal current. They; /archives//html/Amps/2000-02/msg00520.html (8,854 bytes)
163. [AMPS] N conn (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 28 Feb 2000 16:52:36 -0700; Last century I came upon a system where type N connectors were constantly failing. They were used on the output connectors on RCA Y-1086 and Y-1070 cavities, which use 7651 tetrodes at 200 MHz. The h; /archives//html/Amps/2000-02/msg00640.html (7,405 bytes)
164. [AMPS] SB220 mod results (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 13 Jan 2000 11:30:13 -0700; 6 years ago, I modified my SB220 with a new input Pi network(raised Q), with some AG6K parasitic suppressor mods, with various other improvements including step start, better RF relay switching, bett; /archives//html/Amps/2000-01/msg00259.html (12,084 bytes)
165. [AMPS] info on 2 subjects (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 19 Jan 2000 13:54:54 -0700; Another source of 105 degree 2000 hour warranty aluminum electrolytic capacitors is Hitachi, see: http://www.hitachiaic.co.jp/english/ Continental Electronics Corp in Dallas uses a technique of filli; /archives//html/Amps/2000-01/msg00428.html (6,763 bytes)
166. [AMPS] dielectric losses (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 24 Jan 2000 09:26:51 -0700; I've been meaning to get back to the dielectric materials topic with some suggested alternate materials: The following reply is correct, thanks Dave for inserting facts into that discussion. I worked; /archives//html/Amps/2000-01/msg00504.html (16,175 bytes)
167. [AMPS] in the pink (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 22 Dec 1999 08:40:20 -0700; Thanks for the statement below, to help clarify this topic on BeO. The pinkish ceramic on old RCA tubes was made by a company in Frenchtown (NJ, NY, PA?), so was called Frenchtown ceramic. Sometimes; /archives//html/Amps/1999-12/msg00344.html (9,016 bytes)
168. [AMPS] rheostat/autotransformers (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 5 Nov 1999 11:53:02 -0700; I have used both rheostats and autotransformers for filament and HV variation control - always degrading regulation in the process (unless it is the control element for a closed loop regulator!). All; /archives//html/Amps/1999-11/msg00172.html (10,751 bytes)
169. [AMPS] Variac (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sat, 6 Nov 1999 11:01:19 -0700; When I used to work at E.I.DuPont Co., they continued to suffer over loosing the tradename nylon years ago, for their fiber. Teflon also, but they continue to fight unapproved use of that tradename.; /archives//html/Amps/1999-11/msg00186.html (8,341 bytes)
170. [AMPS] CPI/Eimac (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 18 Nov 1999 22:31:47 -0700; I have to offer my 2 cents on the Care and Feeding company. I have worked with them since 1980, using their power tubes in many projects. Bob Tornoe, presently engineering manager, went through the r; /archives//html/Amps/1999-11/msg00405.html (7,546 bytes)
171. [AMPS] filament life again (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 29 Nov 1999 19:05:36 -0700; Thoriated Tungsten vs oxide cathodes Both. Although the mechanical changes in TT filaments in larger tubes with handles are more prone to failure than the lower power heaters of oxide cathodes. For i; /archives//html/Amps/1999-11/msg00552.html (9,994 bytes)
172. [AMPS] 4CX1600A and B (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 30 Nov 1999 12:16:02 -0700; The 4CX1600A is identical to the Russian GU91B tetrode, which can be seen in the old Svetlana Blue databook (1991/92). All specs and dimensions appear identical. Grid dissipation is rated at 0.1 Watt; /archives//html/Amps/1999-11/msg00561.html (8,777 bytes)
173. [AMPS] RFI and windows (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 5 Oct 1999 14:09:56 -0600; As for putting viewing windows in amplifiers: Good old tube medium wave transmitters always had a nice hole to look into, to see the plate orange spot on the 833, 4-400, and larger bottles. The wavel; /archives//html/Amps/1999-10/msg00205.html (11,277 bytes)
174. [AMPS] tube plate resistance (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 5 Oct 1999 15:25:41 -0600; There is a plate resistance in tubes, but it is not used in output matching calculations for RF amplifiers. It is the dynamic plate resistance, the resistance that the plate circuit offers to a small; /archives//html/Amps/1999-10/msg00209.html (11,182 bytes)
175. [AMPS] cheap copper wire, and glass failure (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 8 Oct 1999 10:57:59 -0600; I am using inexpensive 1/8 inch refrigerator tubing from the hardware store for a series of radial grounding conductors, from the base of my tower out in 5 directions, each about 25 feet long. This w; /archives//html/Amps/1999-10/msg00303.html (9,020 bytes)
176. No subject (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 12 Oct 1999 11:32:44 -0600; I have seen high power and low power Y circulators on low band VHF advertized. Several companies make them for 50 MHz range, that I know of. The biggest are made by ANT Bosch Telecom, and they are la; /archives//html/Amps/1999-10/msg00411.html (8,176 bytes)
177. [AMPS] 4CX15K (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 15 Oct 1999 18:39:27 -0600; I have not been able to coax 36 kW out of 4CX15000 in class C, but have gotten 35 kW out of 4CX20,000A/8990 tetrode. It took about 400 Watts of drive and screen voltage turned up, and can be found in; /archives//html/Amps/1999-10/msg00515.html (59,283 bytes)
178. [AMPS] HVCA rectifier (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 24 Oct 1999 13:51:43 -0600; The second one is made by High Voltage Components Associates. The HVDS15KS is probably either a 15 kV PRV or a 1.5 Ampere DC HV diode. Sorry I cannot remember how they number them. Call them in New J; /archives//html/Amps/1999-10/msg00609.html (7,520 bytes)
179. [AMPS] Step Starts (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 2 Sep 1999 09:23:37 -0600; As elegant as having a special DC step start relay with charging circuit, etc., remember that electrolytic caps are notoriously variable as far as long term capacitance tolerence goes. Design so that; /archives//html/Amps/1999-09/msg00012.html (8,125 bytes)
180. [AMPS] more on silver plating - Ugh! (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 24 Sep 1999 10:46:40 -0600; I've been following this silver discussion for some time. Jon hit the nail right in this simple explaination of copper versus silver for RF conductors. In my own experience with broadcast transmitter; /archives//html/Amps/1999-09/msg00251.html (11,363 bytes)

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