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181. [AMPS] Re: SB-1000 WARC usage (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 29 May 1998 15:45:15 -0400; How about an external fixed network between the 850 and the rig, maybe with a 3-position switch for 12, 17 and thru? I'm not smart enough to know how to calculate component values, but presumably an; /archives//html/Amps/1998-05/msg00654.html (7,672 bytes)
182. [AMPS] Class E MOSFET Amps (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 29 Apr 1998 08:50:02 -0400; Did you look at the 2-part QST article? 73, Pete Smith N4ZR In wild, wonderful, fairly rare WEST Virginia -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Adminis; /archives//html/Amps/1998-04/msg00326.html (8,171 bytes)
183. [AMPS] AL1500 vs Alpha91b (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 04 Mar 1998 15:18:25 -0500; How about an SB-220 and an FT-1000MP ;^} 73, Pete N4ZR In Wild Wonderful, fairly rare WEST Virginia -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrativ; /archives//html/Amps/1998-03/msg00049.html (7,205 bytes)
184. [AMPS] Re: big boy toys (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 11 Mar 1998 12:19:59; Oh, I understand about feedline losses. In any case, the reg is transmitter output. I'd like to think the inspectors would cut us 10 percent slack. I'd like even more to think of them dropping in on; /archives//html/Amps/1998-03/msg00169.html (8,111 bytes)
185. [AMPS] Benefit (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sat, 14 Mar 1998 02:34:04; This is silly. The only rational test is to ask yourself, "What's the most cost-effective way to get the *next* dB?" Maybe it's the bigger amp. Maybe it's something else. We need to know a whole lot; /archives//html/Amps/1998-03/msg00260.html (8,920 bytes)
186. [AMPS] Re: Input Impedance. (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 24 Mar 1998 20:45:00; At 06:57 AM 3/24/98 -0800, Phil wrote (I think - these multi-layer quotes are confusing): I don't know the theory, but on my SB-220, when I run it on 24 MHz I usually use the autotuner on my TS-930 t; /archives//html/Amps/1998-03/msg00393.html (8,622 bytes)
187. [AMPS] FS : 0.2 MF 10KV caps (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 27 Mar 1998 09:40:13 -0500; Awww ... why not just wind the plate RFC on a head of garlic and have done with it? 73, Pete Smith N4ZR In wild, wonderful, fairly rare WEST Virginia -- FAQ on WWW: http://www.contesting.com/ampfaq.h; /archives//html/Amps/1998-03/msg00459.html (7,620 bytes)
188. [AMPS] one more mla2500 question (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 16 Feb 1998 13:16:20; I'm not familiar with the MLA 2500, but if the HV metering arrangement is anything like the SB-220 then the "1500v" may be the result of bad multiplier resistors rather than genuinely low plate volta; /archives//html/Amps/1998-02/msg00103.html (8,993 bytes)
189. [AMPS] TS930s-SB220 Interface (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 01 Dec 1997 22:32:42; In my experience (sample size of 1) The 930 definitely switches faster than the 220, even with the big relay in the 930. You can see this because the first dit of each CW transmission shows high SWR,; /archives//html/Amps/1997-12/msg00015.html (9,223 bytes)
190. [AMPS] Re: Amp tune-up (was AL-1500) (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 02 Dec 1997 13:05:51 -0500; this: I operated the entire CQWWCW with my SB-220 and only really tuned up 3-4 times, by using index cards behind the tune and load knobs marked for each band. Preset and go. Maybe 5 seconds to chang; /archives//html/Amps/1997-12/msg00040.html (9,108 bytes)
191. [AMPS] Best HF Amplifier Today?? (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 11 Nov 1997 12:33:23; In fact, a pretty good case can be made that the SB-220/TL-922/L4/L7 class of amps, bought used (what else?), are easily the best value going. Where else can you get a dB for $40-50? I can buy a lot; /archives//html/Amps/1997-11/msg00144.html (9,097 bytes)
192. [AMPS] SB-220 failure (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 01 Sep 1997 12:18:30; This morning, while tuning up my SB-220 on 15 meters, I did the flash-bang-bad smell number, followed by a sudden flare of white light from one of the 3-500Zs in my SB-220. As long-time readers may r; /archives//html/Amps/1997-09/msg00005.html (8,529 bytes)
193. [AMPS] SB-220 continued (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sat, 06 Sep 1997 13:23:18; Thanks to all who responded to my tale about the flash/bang/bad smell in my SB-220. Turns out that a non-standard 1-ohm resistor in one anode lead had failed open. Sorry for the bandwidth consumption; /archives//html/Amps/1997-09/msg00112.html (10,540 bytes)
194. [AMPS] SB-220 continued (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 07 Sep 1997 21:22:34; Well, go figger -- after I swapped the tubes in their sockets I can no longer see a significant difference. The amp does key-down at high voltage and 20 seconds duration with no sign of tube color im; /archives//html/Amps/1997-09/msg00155.html (8,569 bytes)
195. [AMPS] More SB-220 amusement(!) (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 18 Sep 1997 10:39:52; Recently, I installed a Harbach RM-100 metering/diode board in my SB-220. It fixed a low HV meter reading and has performed admirably for a couple of months. This evening, I went to tune up on 80 met; /archives//html/Amps/1997-09/msg00316.html (9,296 bytes)
196. [AMPS] More SB-220 amusement(!) (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sat, 20 Sep 1997 15:44:24 -0700; Rich, it wasn't the grid shunt, but one of the plate metering resistors -- I would have traced the backside of the Harbach board, but am currently in NC attending the birth of a grandchild, and can't; /archives//html/Amps/1997-09/msg00333.html (17,568 bytes)
197. [AMPS] alien para suppressors? (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 06 Jul 1997 19:28:40; I opened up my SB-220 the other day for the first time (to replace the diode board so I could see my real HV) and discovered something odd. It appears to have the Measures mods to the parasitic suppr; /archives//html/Amps/1997-07/msg00012.html (7,352 bytes)
198. [AMPS] SB-220 IMPROVEMENTS (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 01 Apr 1997 12:35:46; And when you consider that the *net* gain from a good tribander is only 5 dB or so over a dipole at the same height, that 10 dB looks better and better. 73, Pete Smith N4ZR n4zr@contesting.com -- FAQ; /archives//html/Amps/1997-04/msg00005.html (8,321 bytes)
199. Re: [Amps] Tuning a 30L-1 (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 01 Nov 2003 05:08:40 -0500; At 07:59 AM 10/31/03 -0800, Vic Rosenthal wrote: Although I don't have a 30L-1, it's common that you get better IMD performance from a gg amplifier when it is loaded slightly more heavily than the po; /archives//html/Amps/2003-11/msg00010.html (7,924 bytes)
200. Re: [Amps] SB220 (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 04 Nov 2003 09:34:33 -0500; At 09:46 AM 11/4/03 +0000, ka1xo@juno.com wrote: However, there's a website and there's a Mr. Measures around this forum who has studied much of the mods on '220's and may offer good ideas. However,; /archives//html/Amps/2003-11/msg00043.html (8,294 bytes)

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