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201. [AMPS] HV PS topics (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 13 May 1999 10:51:14 -0600; I designed HV plate power supplies for the Broadcast Electronics FM-1.5A, FM-3.5A, FM-5A series transmitters in 1982-3. In the 3500 watt model (4CX3500A final), a resonant choke input was used, follo; /archives//html/Amps/1999-05/msg00164.html (12,390 bytes)
202. [AMPS] HV PS topics (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 13 May 1999 16:48:07 -0600; Sounds good Dick (your mounting idea on an insulated sheet). Sorry I am of the school of thought where I don't want to blow fuses and suffer the downtime, but would rather limit the current spike whe; /archives//html/Amps/1999-05/msg00172.html (7,989 bytes)
203. [AMPS] voltage breakdown vs pressure (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 18 May 1999 09:40:19 -0600; Hey Jon, Dick and all, While I don't have a lot of "airtime" right now to elaborate, I would like to add 2 cents worth to the discussion, as it is something that really has a lot of practical meaning; /archives//html/Amps/1999-05/msg00211.html (10,323 bytes)
204. [AMPS] more vacuum (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 19 May 1999 09:35:12 -0600; More vacuum, get it....(oxymoron) To add another nickels worth, an internal arc would be quite quiet, but it is between metallic electrodes usually, so some sound does come out. A horrible sound I re; /archives//html/Amps/1999-05/msg00227.html (9,441 bytes)
205. [AMPS] gas test for tubes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 21 May 1999 17:42:17 -0600; I learned this from the people at Econco (tube rebuilders) for the 4CW250,000B tetrode a few years ago: Connect a variac to the filament transformer. Connect a 75 volt (can be variable) power supply; /archives//html/Amps/1999-05/msg00272.html (8,502 bytes)
206. [AMPS] resonated input chokes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 27 May 1999 11:41:26 -0600; Phil and Bruce, Since you asked for a core dump on tips for building a resonant L section in a power supply filter, here it is. My own experience with resonant choke comes from 1982. I also spent con; /archives//html/Amps/1999-05/msg00323.html (16,684 bytes)
207. [AMPS] news from high power tube RF sources (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 1 Apr 1999 08:04:16 -0500 (EST); Amp builders and curious hams: I am at New York all week at the IEEE Int. Particle Accelerator Conference. Svetlana, CPI/Eimac and Thomson all have booths. Spent some time chatting with Svet, about l; /archives//html/Amps/1999-04/msg00007.html (8,634 bytes)
208. [AMPS] TWT? (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 2 Apr 1999 07:39:10 -0500 (EST); They did have a coupe of brochures on ISTOK products, the magnetrons that I mentioned and they had an inductive output tube (IOT) for UHF television TX. I didn't see the TWT brochure, but if they ar; /archives//html/Amps/1999-04/msg00030.html (6,636 bytes)
209. [AMPS] some info (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 6 Apr 1999 17:41:09 -0600; Globar, the carborundum resistive elements formerly made by Carborundum Corp, later to become Cesiwid, are now produced under the name Kanthal Globar. It appears that they are at the same address in; /archives//html/Amps/1999-04/msg00117.html (6,784 bytes)
210. [AMPS] Oh well (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 6 Apr 1999 18:09:05 -0600; Sorry about that. I make no claims for the ability of companies to actually print good information in their advertisements. That one came from the March 1999 Power Conversion International Magazine.; /archives//html/Amps/1999-04/msg00118.html (7,662 bytes)
211. [AMPS] another classic paper on RF tube amps (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 6 Apr 1999 18:27:05 -0600; While digging to read one of AG6K's favorite references - Gossling (IEE, 1932) on Flash Arcs in High-Power Valves - I stumbled across another classic that I just had to tell ya'll about. THE BALANCIN; /archives//html/Amps/1999-04/msg00119.html (10,401 bytes)
212. [AMPS] parasite (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 8 Apr 1999 00:45:08 +0100; I see a parasite has invaded the ever quiet mailing list. First, I have to comment on Dick's comment: Speak for yourself, OM! I wasn't even a glimmer in my Dad's eye in '47. '56, well, I was crawling; /archives//html/Amps/1999-04/msg00148.html (10,011 bytes)
213. [AMPS] L band oscillation inside tube (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 12 Apr 1999 12:02:26 -0600; Dick, Thanks, but ham radio was the source. Plus starting with MW broadcasting as a teenager, around a Gates BC500T (500 Watts, 1.25 MHz) in South Carolina. Lets say it was more like 29 years. We had; /archives//html/Amps/1999-04/msg00258.html (10,989 bytes)
214. [AMPS] new tubes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 12 Apr 1999 12:06:27 -0600; Hey, I noticed a new descriptor here. The freshness of the Eimac Red paint. Next thing you know, people will be spraying new paint on their tubes, and applying like new Eimac decals. What about the s; /archives//html/Amps/1999-04/msg00259.html (7,435 bytes)
215. [AMPS] One more failure mode (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 12 Apr 1999 12:38:30 -0600; I will add one more failure mode to the SB220 bandswitch which I haven't seen mentioned. You all beat around the other observations, and they make sense to me too. I picked up my 220 in 1993 at a ham; /archives//html/Amps/1999-04/msg00261.html (11,201 bytes)
216. [AMPS] Globar info (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 12 Apr 1999 13:41:18 -0600; I received a mailing from the Kanthal Globar company. It is the same stuff that Cesiwid advertised, just a sticker with Kanthal/Sandvik Company on it. The web site for Globar info appears to be: http; /archives//html/Amps/1999-04/msg00265.html (7,573 bytes)
217. [AMPS] "the old days" (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 13 Apr 1999 11:22:29 -0600; Dick, You were one lucky guy with that DC accident! I somehow have avoided ugly DC shocks (i am knocking on my desk with my hand as I type this), but have had my share of 60 Hz touches, and plenty RF; /archives//html/Amps/1999-04/msg00279.html (9,597 bytes)
218. [AMPS] 915 MHz (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 13 Apr 1999 17:13:46 -0600; Istok, distributed by Svetlana here in the states, has a 200 and 600 watt magnetron to generate RF at 915 MHz, +/- 5. Not like traditional S band magnetrons used in home microwave ovens, these parts; /archives//html/Amps/1999-04/msg00283.html (7,560 bytes)
219. [AMPS] glass 3-500Z status (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 21 Apr 1999 16:37:22 -0600; As I write this, the Ham Radio Reception is about to be held at the National Association of Broadcasters Convention in Las Vegas. This year, it is hosted by Svetlana. Traditionally it was hosted by E; /archives//html/Amps/1999-04/msg00375.html (9,112 bytes)
220. [AMPS] power meter errors (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 29 Apr 1999 12:45:15 -0600; A few years ago I designed in a diode-based relected power sensor on a directional coupler, where it was in the intermediate coax driving the final PA input tuning circuit. It drove a digital meter r; /archives//html/Amps/1999-04/msg00452.html (7,966 bytes)

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