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341. [AMPS] AUTOTUNING (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 10 Nov 1997 11:04:56 -0700; G8WRB asked: G8WRB conculded: FOR AMPLIFIER AUTOTUNING (FEEDBACK CIRCUITS): Yes, the text you want to take a look at is "SSB Circuits and Systems", 1964, by Pappenfuss, Bruene, and Schoenike, (all of; /archives//html/Amps/1997-11/msg00129.html (14,230 bytes)
342. [AMPS] Nichrome or Globar (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 10 Nov 1997 16:07:05 -0700; There are 'suppressors' in VHF transmitters (FM broadcast) using Nichrome alloy wire directly in the plate choke for the tetrode plate DC feed. This is in a cavity amplifier, where shunt feed is used; /archives//html/Amps/1997-11/msg00132.html (9,876 bytes)
343. [AMPS] Yet more parasitics (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 11 Nov 1997 11:21:43 -0700; OK, it's perfectly fine to have such a diversity of thought on parasitic suppressors and on parasitic generation itself. By the way, I have built VHF solid state power amplifiers where they oscillate; /archives//html/Amps/1997-11/msg00161.html (9,527 bytes)
344. [AMPS] bias on Solid State (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 11 Nov 1997 16:16:01 -0700; KM1H stated following: Actually I didn't even think about the brick manufacturers. I was referring to drivers or IPA stages for VHF broadcasting. Yes, not using a good bias circuit (with temperature; /archives//html/Amps/1997-11/msg00167.html (7,586 bytes)
345. [AMPS] plate power (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 17 Nov 1997 12:24:25 -0700; For the past 10 years, more power supplies are being built that use high frequency switching techniques (not to be confused with what hams call high frequency!). We used to buy 6 KW 2.45 GHz band mic; /archives//html/Amps/1997-11/msg00234.html (10,237 bytes)
346. [AMPS] screen power supply (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 19 Nov 1997 10:02:45 -0700; Ham Radio, June 1986, has a regulated screen grid PS article by Rich, AG6K. Uses string of zeners and a TMOS FET. Not only small but big 'handled' tetrodes too. The Burle (RCA) 4616 tetrode almost al; /archives//html/Amps/1997-11/msg00272.html (10,274 bytes)
347. [AMPS] SS relay on mains (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 20 Nov 1997 12:54:29 -0700; Solid State relay (dual SCR or Triac unit) will work fine on the powerline if you rate it carefully for the inrush current. And put some transorbs, MOVs, or something on your line for transient prote; /archives//html/Amps/1997-11/msg00296.html (8,241 bytes)
348. [AMPS] just reading (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 24 Oct 1997 18:45:32 -0600; To no one in particular: I have little to add about ham/contesting amplifiers so sorry to disrupt with this posting. I wanted to do an introduction, and then vanish into the readership. (we'll see).; /archives//html/Amps/1997-10/msg00145.html (10,767 bytes)
349. [Amps] 8877 HB amplifier (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 25 Aug 2003 11:48:17 -0600; Thats a rather nice looking amplifier, Paul. FB! 73 John K5PRO _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2003-08/msg00030.html (6,556 bytes)
350. [Amps] using 4CX350A (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Tue, 2 Sep 2003 11:32:27 -0600; When using 4CX350A tetrodes, be sure to check and maintain the filament voltage, below the Eimac data sheet value, unless you need high pulsed current. Reason for this is that there was a mistake in; /archives//html/Amps/2003-09/msg00023.html (7,560 bytes)
351. [Amps] grease for tuning sliding contacts (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Wed, 10 Sep 2003 11:21:07 -0600; Moly-disulphide lube: Every big CPI/Eimac tube(100kw and up) used to come shipped with a tube of Fel Pro C100 molydinum sulphide paste, used on the copper anode where the water fittings screwed in. (; /archives//html/Amps/2003-09/msg00096.html (7,952 bytes)
352. [Amps] bonding plastic chimneys (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 15 Sep 2003 09:46:36 -0600; Hey Arne (and gang) Would punching a couple of holes (say 3) and then using short 4-40 nylon screws and nuts work? Both for silicone or PTFE sheet. Maybe a small bead of clear silicone RTV over the s; /archives//html/Amps/2003-09/msg00130.html (7,481 bytes)
353. [Amps] Metcal soldering iron and microscopes (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 15 Sep 2003 09:53:47 -0600; Chris, GW4DGU, stated: The trick is to get decent optical aids. Looking across at my bench, I have a x10 binocular microscope (brought on eBay for about USD50), a large lens magnifier, and a pair of; /archives//html/Amps/2003-09/msg00132.html (7,887 bytes)
354. [Amps] Lossy rod stock for coils (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 15 Sep 2003 10:32:26 -0600; Neil, G0JHC, asked: Although I see a number of articles (here in Europe) suggesting PTFE or Tufnol maybe used in the applications mentioned, I rarely see anyone using Tufnol. In order to "get wise" o; /archives//html/Amps/2003-09/msg00135.html (9,147 bytes)
355. [Amps] nylon screws in chimneys (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Tue, 16 Sep 2003 10:56:24 -0600; I think the nylon screws might work if they remain small, and don't reside in regions where intense fields would cross, such as just in a small space between hot and ground conductors. In a chimney,; /archives//html/Amps/2003-09/msg00146.html (7,702 bytes)
356. [Amps] Metcal contact with MOV? (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Wed, 17 Sep 2003 11:19:00 -0600; The contacts of the Metal tip happen to be a coaxial connector, with 13.56 MHz RF power. I don't believe it would be wise to put MOV across that, due to the stray capacitance of the MOV and the RF vo; /archives//html/Amps/2003-09/msg00161.html (8,553 bytes)
357. [Amps] more high power ceramic capacitors (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Thu, 9 Oct 2003 14:46:57 -0600; Someone mentioned that ATC makes the 100E series of transmitting ceramic capacitors, which have wide straps for leads (or can be SM). Murata Erie has also made similar parts, and they can be found su; /archives//html/Amps/2003-10/msg00074.html (7,333 bytes)
358. [Amps] stuff available in NM (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 20 Oct 2003 09:40:17 -0600; I saw a garage full of SK estate stuff Saturday, which is going to be hauled to Socorro, NM hamfest this weekend. Too much to list, but the ham (DXCC) was an amplifier builder, so he had many tubes,; /archives//html/Amps/2003-10/msg00196.html (6,773 bytes)
359. [Amps] 1200 vs 1500 triodes (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Fri, 24 Oct 2003 08:52:05 -0600; I vote for the 3CX1500A7/8877-based amplifier also. I helped design an FM broadcast amplifier using it in 1983, and it easily produced 1500 watts of CW output class C at 108 MHz. Last year I converte; /archives//html/Amps/2003-10/msg00227.html (8,632 bytes)
360. [Amps] more on 1200 vs 1500 triodes (score: 1): Author: "John T. M. Lyles" <jtml@lanl.gov>; Date: Mon, 27 Oct 2003 09:42:49 -0700; Reply noted below: Last year I converted a RF Power Products plasma generator from 13.56 to ~4-5 MHz for a scientific application. It had a questionable old tube in it, as it was pulled from another; /archives//html/Amps/2003-10/msg00252.html (7,372 bytes)

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