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281. [AMPS] 30L1 Grid circuit (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 14 May 1997 15:24:20 +0000; Hey Guys, Look at the grid circuit of the Collins carefully, and look at a few things. The theory presented (Orr also presents the same theory in his "Super Cathode Driven" circuit article) is that t; /archives//html/Amps/1997-05/msg00105.html (11,789 bytes)
282. [AMPS] 30L1 Grid circuit (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 14 May 1997 22:28:14 +0000; At Heath and at Ameritron, Orr applied pressure to use the 220 pF caps from the grid to ground. The reason does not really matter, the fact the caps are there is the only important thing. So while y; /archives//html/Amps/1997-05/msg00112.html (11,645 bytes)
283. [AMPS] 30L1 Grid circuit (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 15 May 1997 09:15:18 +0000; Hi Pete, used to connect Your problem illustrates my point about the grid system in the 30L1, and the silly super cathode driven system applied to triodes. The 30L1 lacks two things important for sta; /archives//html/Amps/1997-05/msg00117.html (10,209 bytes)
284. [AMPS] Filament breakage (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 15 May 1997 09:15:18 +0000; Very simple, the arc itself can getter the gas. That effect is very well documented in published literature on gettering tubes, arcing is listed as one of the ways a tube is gettered. The tube's ele; /archives//html/Amps/1997-05/msg00118.html (9,276 bytes)
285. [AMPS] Re: [super cathode] (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 16 May 1997 13:53:26 +0000; Rich, I can fax you a copy of the article. That would be easier. But simply, Orr labels the system where the grid is fed out-of phase signal with respect to the cathode SEMI. He labels the system wh; /archives//html/Amps/1997-05/msg00127.html (12,309 bytes)
286. [AMPS] Re: 30L1 Grid Circuit (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 17 May 1997 14:19:08 +0000; Hi Phil, The Ten Tec Centaur measured -39dB (3rd) and -45 dB (5th) in the ARRL review, and uses no "special length" cable or tuned input! The AL-811H measures about -41and -48 when operated at the sa; /archives//html/Amps/1997-05/msg00145.html (10,135 bytes)
287. [AMPS] Re: [super cathode] (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 17 May 1997 14:19:08 +0000; Hi Rich, I refuse to get into personal arguments, but I have no problem with technical disagreements. You asked for and I offered the data. The article covers that, as did private conversations with; /archives//html/Amps/1997-05/msg00146.html (9,762 bytes)
288. [AMPS] neutralization (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 18 May 1997 09:26:17 +0000; The SB-200 was not neutralized because it was only two 572B tubes. Two 572B tubes are on the edge of stability, and should probably be neutralized. The FL-2100 suffers from instability that could be; /archives//html/Amps/1997-05/msg00152.html (9,697 bytes)
289. [AMPS] neutralization (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 19 May 1997 10:30:52 +0000; Actually Ian they do mention the bridge neutralization circuit applied to grounded grid PA's, and as I posted QST has an article on it (that I offered to FAX but Rich does not want to see). In the se; /archives//html/Amps/1997-05/msg00160.html (9,136 bytes)
290. [AMPS] Suppressor impedance (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 20 May 1997 10:47:26 +0000; Actually there seems to some "confusion" about the change caused by nichrome. I don't intend to argue this, so this will be my single group post on this subject. People should use common sense and th; /archives//html/Amps/1997-05/msg00169.html (9,308 bytes)
291. [AMPS] neutralization (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 20 May 1997 21:57:04 +0000; Hi Ian, Actually it isn't so confusing. Virtually all RF and tube design engineers agree about this subject Ian. Tubes with long thin grid connections are the most likely to cause trouble. 4-1000A's,; /archives//html/Amps/1997-05/msg00178.html (9,112 bytes)
292. [AMPS] 2100z (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 21 May 1997 08:41:13 +0000; Probably the network Q ids too high to cover those bands when the input is adjusted for 15 and 10 meters. There is so much feedback in PA's using triodes like 572's on the higher bands, and the driv; /archives//html/Amps/1997-05/msg00183.html (8,929 bytes)
293. [AMPS] suppression (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 22 May 1997 09:52:17 +0000; Hi Bill, Hi Bill, No, that's not exactly correct. Let me take a stab at "un-confusing" this issue. Every combination of components has a two terminal impedance at any given frequency. This "Rp value"; /archives//html/Amps/1997-05/msg00193.html (12,922 bytes)
294. [AMPS] suppression (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 22 May 1997 23:03:16 +0000; Hi Carl, The rule of thumb in a tube with poor grid grounding is the resistance has to nearly equal or slightly exceed the impedance of the anode to chassis path at the oscillation frequency. Suffici; /archives//html/Amps/1997-05/msg00197.html (10,635 bytes)
295. [AMPS] Re: diodes (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 23 May 1997 09:12:37 +0000; Hi Bill, that i know of, Any answer would be a wild guess unless we knew more about the supply. A better description would help. How many diodes do you use and what type are they? What is the supply; /archives//html/Amps/1997-05/msg00198.html (7,512 bytes)
296. [AMPS] Re: [fuses] (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 23 May 1997 20:35:55 +0000; Hi George, A fuse does nothing other than prevent long term thermal damage. A look at Littlefuse's catalog shows that it takes a several hundred percent overload for seconds to open up some fast blo; /archives//html/Amps/1997-05/msg00204.html (7,499 bytes)
297. [AMPS] Re: skin depth suppression (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 23 May 1997 22:56:49 +0000; Hi Carl, Here's another case where mixing models can mislead us. I'm talking about changing the material in the inductor, and the effect on VHF impedance of the entire L/C combination when viewed as; /archives//html/Amps/1997-05/msg00205.html (9,198 bytes)
298. [AMPS] Re: skin depth suppression (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 25 May 1997 09:19:01 +0000; That's right Phil, it is a good idea. Chrome over copper would give even more slope with frequency. To obtain higher slope in the AL-572 (it uses four 572B tubes) and AL-1200, as well as some other; /archives//html/Amps/1997-05/msg00211.html (11,190 bytes)
299. [AMPS] Experience with K2AW rectifiers anyone? (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 27 May 1997 06:51:46 +0000; I agree with Carl. All these rectifier "blocks" are is a string of regular diodes inside an epoxy case. Why bother replacing a very heavy duty diode string with a string of much smaller diodes in a; /archives//html/Amps/1997-05/msg00224.html (9,303 bytes)
300. [AMPS] Re: skin depth suppression (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 27 May 1997 09:13:05 +0000; Yes Terry, you (and others) are missing a whole bunch. Nearly all the explanation!! Plating over a GOOD conductor INCREASES the slope. Using a uniform conductivity to the core POOR conductor DECREAS; /archives//html/Amps/1997-05/msg00227.html (9,298 bytes)

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