Mail Archive Search: <+from:jtml@lanl.gov>

Results:

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

Total 562 documents matching your query.

221. [AMPS] HVPS rectifiers (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 29 Apr 1999 12:48:49 -0600; I have listed some suitable sources of HV rectifier modules, epoxied, so that you don't have to wire the diodes in series yourself and mount them. These are industrial quality, what the broadcast and; /archives//html/Amps/1999-04/msg00453.html (10,505 bytes)
222. [AMPS] surplus 6 meter deck (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 2 Mar 1999 11:56:44 -0700; Has anyone played with those 4PR1000A amplifiers for 42 MHz that Bob Grinnell has at Surplus Sales of Nebraska? They are a bit pricy, without a power supply. Would make a lot of 6 meter RF? http://ww; /archives//html/Amps/1999-03/msg00025.html (6,756 bytes)
223. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 8 Mar 1999 23:39:24 -0700; Fellow hams on this emailer: I have noticed a tendency for some of you to include the original message, which included the original message, which included the original message, and all of the associ; /archives//html/Amps/1999-03/msg00176.html (21,817 bytes)
224. [AMPS] chokes and Xfmrs (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 9 Mar 1999 23:20:08 -0700; I have spec'd a number of transformers for plate, screen, bias and filament service in amplifiers, and found good and bad sources. For instance, Basler Electric in East St. Louis, MO, is a fine sourc; /archives//html/Amps/1999-03/msg00208.html (9,707 bytes)
225. [AMPS] KE9NA's successful PA (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 15 Mar 1999 10:39:25 -0700; Congrats to Jon, KE9NA, on the 4-1000 amp. Hey, if it works like you said, don't ask questions, just knock on wood, good job! I am surprised that the series L in the plate connection didn't just move; /archives//html/Amps/1999-03/msg00314.html (8,843 bytes)
226. [AMPS] strange idling current (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 15 Mar 1999 11:31:55 -0700; Dick, I will respond to these in reverse order, even though you apparently have proven that the 3CX800A7 isn't really drawing 17 mA. Still, had it been, you could be assured that it was trouble. For; /archives//html/Amps/1999-03/msg00316.html (13,427 bytes)
227. [AMPS] misc topics (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 18 Mar 1999 11:03:05 -0700; Thoriated Tungsten tubes were used in a lot of broadcast radio transmitters from the 50's to the present age, as they had reasonably long life, and could be termed 'instant on'. In a line of FM trans; /archives//html/Amps/1999-03/msg00429.html (9,237 bytes)
228. No subject (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 22 Mar 1999 10:28:31 -0700; Informaton on the HAARP project in Alaska, which is now installed, a lot of transmitters on HF! They are running a transmission on CW this week below 40 and 80 meters, and have a nice QSL to give if; /archives//html/Amps/1999-03/msg00559.html (6,934 bytes)
229. No subject (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 8 Feb 1999 09:33:04 -0700; A week or so ago, someone asked what industrial uses were for 8877/3CX1500A7 triodes. There must be a few hundred (?) Broadcast Electronics FM1.5A transmitters, that use this in grounded grid, cathod; /archives//html/Amps/1999-02/msg00229.html (7,227 bytes)
230. [AMPS] Metal, as in Heavy (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 8 Feb 1999 09:26:48 -0700; There's a pun here somewhere: John Kay? Heavy Metal? Anyone else see it? Sorry - Mike N2MG Got it... I was a student of that era. 73 K5PRO -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submiss; /archives//html/Amps/1999-02/msg00230.html (7,454 bytes)
231. [AMPS] CT filament secondary (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 10 Feb 1999 18:08:50 -0700; Arden, Bill, Adding a hum bucking circuit is plausable, it's done in some older commercial b'dcast transmitters. But it must be tweaked for each tube,since it is not exactly feedback, but a method of; /archives//html/Amps/1999-02/msg00306.html (11,491 bytes)
232. [AMPS] coil form plastics (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 12 Feb 1999 13:07:59 -0700; To: <amps@contesting.com> Delrin is an acetyl resin, does make a nice 60 Hz insulator, thats about it. And it is quite hydroscopic to boot! One would be asking for big trouble to use it over a few KV; /archives//html/Amps/1999-02/msg00336.html (11,317 bytes)
233. [AMPS] more on plastics (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 14 Feb 1999 23:54:37 -0700; The point where the dielectric loss factor (or dissipation factor) turns up and begins runaway is normally around the glass transistion temperature of the polymer. (is that for Thermoplastic or Therm; /archives//html/Amps/1999-02/msg00386.html (7,441 bytes)
234. [AMPS] insulation film rating (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 16 Feb 1999 11:41:14 -0700; The 10 kV suggestion sounds reasonable. Peter brings up a very important point, however. Air pockets within your dielectric film will eventually EAT the dielectric. More accurately, ionized air (ozon; /archives//html/Amps/1999-02/msg00423.html (12,520 bytes)
235. [AMPS] selecting dielectrics (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 16 Feb 1999 11:54:06 -0700; I'm with Rich, if I have a material with high dissipation factor on the charts, and one with low factor, and I expect a some kV of RF in there, I would select based on the numbers (and cost or availa; /archives//html/Amps/1999-02/msg00424.html (8,121 bytes)
236. [AMPS] more comments on plastics (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 17 Feb 1999 11:03:10 -0700; Hi Dick, Looks like we agreed on the danger of voids inside dielectric materials for capacitors and such. These are not the things that you pick up in the ARRL Handbook I'll bet. Having been there, d; /archives//html/Amps/1999-02/msg00452.html (9,463 bytes)
237. [AMPS] testing under load HV DC (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 18 Feb 1999 13:19:29 -0700; Last summer we bought some power supplies for 20 KVDC, 2 Amps average, 20 Amps pulsed rating. We bought 5 or 6 of them, and they are plate voltage for our IPA stages in our 200 MHz RF plant, for the; /archives//html/Amps/1999-02/msg00474.html (7,418 bytes)
238. [AMPS] tube linearity (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 18 Feb 1999 14:19:51 -0700; There are experts in the audio field out there who have their reasons that certain tubes SOUND better in audio (related to distortion and nonlinearity as well as other reasons such as hum, microphoni; /archives//html/Amps/1999-02/msg00476.html (10,181 bytes)
239. No subject (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 19 Feb 1999 14:26:01 -0700; As far as testing HV supplies go, use higher value resistors like Jim Strohm suggested. A 1 Ohm load would just blow fuses fast (one hopes). We had Universal Voltronics Corp test a 18 KV 6 Amp plate; /archives//html/Amps/1999-02/msg00508.html (7,287 bytes)
240. [AMPS] Tesla coil effects in open turns of coils (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 10 Jan 1999 15:37:33 -0700; Was reading the comments about shorting the unused turns on an RF power inductor. Comments that leaving unterminated open turns (coupled) leads to Tesla Coil effects. I would have to guess that it wo; /archives//html/Amps/1999-01/msg00131.html (9,014 bytes)

Current List: 221 - 240
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]