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321. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 10 Feb 1998 12:09:29 -0700; KQ4OO asked: Unfortunately, I cannot even remember who bought out who in Germany now. I suspect that someone over there might know. The last address I had for AEG was: AEG Aktiengesellschaft Technisc; /archives//html/Amps/1998-02/msg00058.html (7,335 bytes)
322. [AMPS] Contemplating Building of First amp] (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 11 Feb 1998 11:00:11 -0700; Yes, 812 would be hard to drive(lower gain). 813 is beam power tube (tetrode), not triode. Maybe it could be connected grid to screen and run in triode mode, although it may be easy to overdissipate; /archives//html/Amps/1998-02/msg00070.html (8,690 bytes)
323. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 27 Feb 1998 10:00:39 -0700; I've noticed that also, maybe everybody is contesting. Seriously, I have been reading with interest all the comments on various amplifier makes, but don't have much to say about these 'peanut whistle; /archives//html/Amps/1998-02/msg00151.html (7,647 bytes)
324. [AMPS] Eimac Y-477 (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 1 Jan 1998 19:06:53 -0700; I have a couple of Y477's. They came out of Mil surplus aircraft HF amplifiers. I got 3 or 4 of them locally, and stripped one, sold the others for parts. The Y477 is very similar to the 4CX1500B, in; /archives//html/Amps/1998-01/msg00002.html (7,184 bytes)
325. [AMPS] solid state RF power for HF (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 5 Jan 1998 13:22:19 -0700; Over the holiday, K4GF (James Fisher) asked about BJT (bipolar junction transistor) or FET (field effect transistor) devices to use in a 400 Watt 3.9 MHz amplifier. I looked at my catalogs, and here; /archives//html/Amps/1998-01/msg00011.html (11,579 bytes)
326. [AMPS] Y131A --> SK800B (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 12 Jan 1998 11:39:59 -0700; RE: NJ4F's Y131A Eimac socket. The Y131A is similar to SK800B, used for 4CX1000A, 4CX1500B. However, it is for Grounded Screen application, and has no built in screen bypass like the 800B has (1.5nF); /archives//html/Amps/1998-01/msg00036.html (7,502 bytes)
327. [AMPS] pushes and pulls (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 21 Jan 1998 17:29:34 -0700; My project right now is a push-pull amplifier, to deliver 10 Kv peak (not Peak to peak) on each side, 180 deg phased. At 2 to 6 Mhz. Combined into a transformer or combiner, it will deliver 20 Kv Pea; /archives//html/Amps/1998-01/msg00076.html (10,326 bytes)
328. [AMPS] Heater warmup time on *big* tubes (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 22 Jan 1998 12:02:29 -0700; Many of the large tubes are similar to the medium sized tubes as far as the filament material. Thoriated tungsten mesh, thoriated tungsten bars, thoriated tungsten wire. As you know, the 3-500Z is t; /archives//html/Amps/1998-01/msg00086.html (11,912 bytes)
329. [AMPS] cycling filaments for gas? (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 23 Jan 1998 09:45:07 -0700; Dave asked if running spare tubes for a few hours of filament time is good practice, to activate getters and such, to scavenge any gas accumulation. IMHO, yes, but depends on the tube. As a former br; /archives//html/Amps/1998-01/msg00090.html (8,949 bytes)
330. [AMPS] 3CX3000A7 (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 27 Jan 1998 09:12:27 -0700; Some small transmitter manufacturers use the 3CX3000A7 triode in grounded-grid operation at 100 MHz for FM broadcast amplifiers, class B or C. QEI uses it up to 5 KW output, driven by a 500 watt soli; /archives//html/Amps/1998-01/msg00098.html (6,714 bytes)
331. [AMPS] Experience with SS kits from CCI (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 27 Jan 1998 12:44:40 -0700; I bought the AR176A kit from Communications Concepts International in 1990. It's the 1 KW HF amplifier using a pair of Motorola MRF154 HogFets (named for Helge O. Granberg, designer, who is now among; /archives//html/Amps/1998-01/msg00100.html (8,419 bytes)
332. [AMPS] RCA tube ID (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sat, 31 Jan 1998 12:19:44 -0700; to W6NQ: Does it have a conduction cooler mounting on one side, like a flat plate, or is it just cylindrical like an air cooled tube without fins? It could be anyone of the old RCA tubes, they made a; /archives//html/Amps/1998-01/msg00135.html (7,974 bytes)
333. [AMPS] parasites (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 3 Dec 1997 12:48:45 -0700; It seems that the bandwidth being used to carry on the parasitic discussion is excessive. My delete keys is getting mashed hourly now. There are other discussions of the subject in print, from years; /archives//html/Amps/1997-12/msg00056.html (8,001 bytes)
334. [AMPS] Microprocessor control of high power amps (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 8 Dec 1997 12:23:14 -0700; hi, I have some experience with this topic, but it is dated... I'm sure folks like Dick at ETO have a lot of background with this. Most of the broadcast transmitters over $25,000 have an embedded con; /archives//html/Amps/1997-12/msg00145.html (12,234 bytes)
335. [AMPS] Need HV insulators/feedthru (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 8 Dec 1997 16:07:20 -0700; Contact Caton Connectors in Massachusetts. They aren't cheap, probably over $100 a connector, but it you want a reliable HV connector good for Amperes of DC.... They make special cables coming off wi; /archives//html/Amps/1997-12/msg00156.html (8,780 bytes)
336. [AMPS] misc chat (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 9 Dec 1997 13:00:45 -0700; HV CONNECTORS: Thanks for reminding us about Alden Co for connectors. I have not seen their literature in years, but somewhere remember seeing them. Sorry for the high end recommendations yesterday,; /archives//html/Amps/1997-12/msg00191.html (11,279 bytes)
337. [AMPS] HV glitch resistor/fuse? (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 9 Dec 1997 21:19:49 -0600; Hey, When you fuse a HVDC line, remember that when the fuse blows during a fault, that DC doesn't like to be interrupted. What I mean is that you can sustain a nice long hot arc. I remember an experi; /archives//html/Amps/1997-12/msg00196.html (12,966 bytes)
338. [AMPS] various (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 12 Dec 1997 11:47:28 -0700; Having interaction with the Eimac engineers, marketing, and sales folks for about 18 years now, I have worked with Mr. Brandon and others. And it is true that they hold this forum at arms length and; /archives//html/Amps/1997-12/msg00257.html (14,068 bytes)
339. [AMPS] tube arcs - internal and external (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 18 Dec 1997 10:24:21 -0700; Thanks for your information, Dick, on the ETO experience with tube arcs. To shed a little more experience with internal/external tube arcs, I will take you back to 1992. I became involved with a prob; /archives//html/Amps/1997-12/msg00328.html (13,188 bytes)
340. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 3 Nov 1997 13:14:56 -0700; Quote from Mclean Engineering (blower) catalog: "for 50 Hz operation where the blower speed and air output is reduced by approximately 16%". Also, cheap transformers definitely use less iron, and sma; /archives//html/Amps/1997-11/msg00026.html (7,722 bytes)

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