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141. Re: [Amps] Gettering 3-500 Tubes (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 8 Nov 2011 08:47:28 -0600; Uh, because there's no getter in them? Nothing in them outgasses? vac caps can leak and then...you have to pay Mr. Jennings more money. Why would he want to do anything about that (if he could)? I u; /archives//html/Amps/2011-11/msg00033.html (8,407 bytes)
142. [Amps] Can distilled water be used for a dummy load ?? (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 29 Nov 2011 09:10:31 -0600; How about using oil in a container then placing that container in a larger tub as a safety to contain a leak? 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2011-11/msg00169.html (7,085 bytes)
143. Re: [Amps] Shipment of large old tubes (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 20 Dec 2011 08:59:53 -0600; I have been told the xxxTH tubes with the possible exception of the 100TH, really cannot be shipped safely. The plate stems are just too long. 250, 450, 750 are tubes to be carefully driven to a flea; /archives//html/Amps/2011-12/msg00154.html (7,501 bytes)
144. Re: [Amps] Centurion (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Wed, 28 Dec 2011 21:53:20 -0600; I have a Centurion and mine is open now as I am working on it. I have not focused on the band switch because I have not had to yet (fortunately). It looks like a PITA to replace. That switch is a cus; /archives//html/Amps/2011-12/msg00258.html (8,926 bytes)
145. Re: [Amps] Centurion (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Wed, 28 Dec 2011 22:04:41 -0600; P.s. It looks to me that they probably use a customized Multi-Tech model 78 with 20 degree index. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com htt; /archives//html/Amps/2011-12/msg00261.html (6,944 bytes)
146. Re: [Amps] Centurion (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Thu, 29 Dec 2011 17:52:35 -0600; I expect TT used different switches through the production run. I searched the CRL on-line "switch-finder" web interface and was unable to locate anything close to what's in my Centurion which was ma; /archives//html/Amps/2011-12/msg00276.html (12,181 bytes)
147. Re: [Amps] AL-1500 for legal-limit 160m AM? (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 30 Dec 2011 11:15:19 -0600; I agree--300 - 400 w. ain't QRO : ) That's too bad. You miss out on some of the highest build quality gear available because of that. After the maximum blower speed, the next thing to consider is: W; /archives//html/Amps/2011-12/msg00283.html (8,675 bytes)
148. Re: [Amps] IMD (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 30 Dec 2011 11:27:34 -0600; my guess on CW that most of the problem is exciters with an extremely fast rise. With any gear in any mode, if you have an almost instantaneous rise or cutoff (clipping) you get the spark transmitter; /archives//html/Amps/2011-12/msg00285.html (8,516 bytes)
149. Re: [Amps] Centurion (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 30 Dec 2011 11:19:52 -0600; Gary, you are welcome. Please tell me how you resolve the issue since, as a Centurion owner, I am interested in how you ultimately obtain a switch. Jim mentioned CRL and to be sure, I see CRL switche; /archives//html/Amps/2011-12/msg00286.html (8,416 bytes)
150. Re: [Amps] IMD (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 2 Jan 2012 11:50:40 -0600; This is why it cannot really be used to limit peak power. The audio has to be tightly limited with a broadcast grade audio limiter, but most hams don't want to spend the money on one. 73 Rob K5UJ ___; /archives//html/Amps/2012-01/msg00015.html (7,932 bytes)
151. Re: [Amps] Henry HF 2500 (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 2 Jan 2012 12:00:23 -0600; Are you sure that's a Henry? Never heard of a Henry HF-2500. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf; /archives//html/Amps/2012-01/msg00016.html (7,082 bytes)
152. Re: [Amps] To rewind or not? (3KA resonant filter choke) (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Thu, 5 Jan 2012 11:37:39 -0600; Maybe what it needs is to be baked out and potted. We have shops around here (transformer shops I mean) that do that. I don't know where you are located but noisy iron can be quieted down that way an; /archives//html/Amps/2012-01/msg00062.html (8,289 bytes)
153. Re: [Amps] L4B Plate choke (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 7 Jan 2012 06:37:56 -0600; You might be able to get from Ten Tec the choke they use in their Centurion amp. It is a single continuous winding and around 4 inches tall. Otherwise, before going off on the Ameritron choke (I assu; /archives//html/Amps/2012-01/msg00099.html (8,051 bytes)
154. Re: [Amps] To rewind or not? (3KA resonant filter choke) (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 7 Jan 2012 06:50:55 -0600; Get something like an old Simpson 260 series 5 or less, (the ones that measure up to 5 KV AC or DC) and start out using that with and without the probe to check it out and gain confidence; if it seem; /archives//html/Amps/2012-01/msg00102.html (8,348 bytes)
155. Re: [Amps] To rewind or not? (3KA resonant filter choke) (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sun, 8 Jan 2012 18:05:40 -0600; We're not writing about 5 or 6 KV on a 260--it isn't made for that--he wanted to measure 4 KV. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2012-01/msg00110.html (8,627 bytes)
156. Re: [Amps] To rewind or not? (3KA resonant filter choke) (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sun, 8 Jan 2012 19:19:34 -0600; Okay thanks--well Simpson probably had good reasons for dropping the 5 KV range in series 6 : ) VTVM and h.v. probe is indeed much safer. Rob K5UJ _______________________________________________ Amps; /archives//html/Amps/2012-01/msg00112.html (9,988 bytes)
157. Re: [Amps] 8877 tubes (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 13 Jan 2012 12:10:10 -0600; Hi Hsu, Can you provide comment on manufacturers of other tubes: 3-500, 572B and 833A in China? Thanks very much 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@con; /archives//html/Amps/2012-01/msg00141.html (8,044 bytes)
158. Re: [Amps] I hope this is not new only to me ... (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 21 Jan 2012 11:38:22 -0600; If you go that route you'll probably spend more on all new parts than you would if you just bought a new manufactured Ameritron amp. I don't want to discourage building though. 73 Rob K5UJ __________; /archives//html/Amps/2012-01/msg00162.html (7,526 bytes)
159. Re: [Amps] 3cx800a7 Grid Current Problem (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Thu, 26 Jan 2012 12:47:05 -0600; I have heard that on 160, some of those amp's filament chokes or other input components (caps) are not as stout against RF as they are on the higher bands. the matching circuit may be okay but some o; /archives//html/Amps/2012-01/msg00204.html (12,645 bytes)
160. Re: [Amps] 3cx800a7 Grid Current Problem (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Thu, 26 Jan 2012 16:08:41 -0600; I see; okay thanks Carl. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-01/msg00207.html (8,387 bytes)

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