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181. Re: [Amps] Orientation (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 6 May 2005 12:28:42 +0100; Having opened one up, the construction is such that it doesn't matter a jot. Be sure to have a good support for the anode cooler, though! Steve _______________________________________________ Amps ma; /archives//html/Amps/2005-05/msg00099.html (6,962 bytes)
182. Re: [Amps] Orientation (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 6 May 2005 16:12:03 +0100; I need to correct myself - the tube I opened up was GS35, not GS23, although I expect the internal construction is substantially the same, and my comments apply. Sorry! Steve ________________________; /archives//html/Amps/2005-05/msg00104.html (7,355 bytes)
183. Re: [Amps] Orientation (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 6 May 2005 21:07:16 +0100; Can't see the orientation affecting it myself. GS35 pics: http://g8gsq.ic24.net/gs35g.jpg pic of the grid mesh with a well worn cathode underneath http://g8gsq.ic24.net/gs35a.jpg corresponding surfac; /archives//html/Amps/2005-05/msg00112.html (8,930 bytes)
184. Re: [Amps] Orientation (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 7 May 2005 08:09:58 +0100; Coaxial could be different - on the other hand, I can't imagine the internal construction being flimsy, in which case it's the thermal effects rather than gravity that are likely to be significant. Y; /archives//html/Amps/2005-05/msg00125.html (8,440 bytes)
185. Re: [Amps] ARF1505 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 21 May 2005 09:00:35 +0100; It might not be quite that simple. If I remember the app. note for the 50MHz 'linear', the IMD is always poor because the devices don't have a linear transfer characterisitic - the power in/out curve; /archives//html/Amps/2005-05/msg00233.html (9,272 bytes)
186. Re: [Amps] ARF1505 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 21 May 2005 09:34:26 +0100; I'm sure there will be enough interest for someone to generate the data. I was assuming that the underlying semiconductor design was similar to their other parts, in which case the characteristics ar; /archives//html/Amps/2005-05/msg00235.html (8,631 bytes)
187. Re: [Amps] ARF1505 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 24 May 2005 09:45:35 +0100; Yes, but the specs. appear attractive. What's not immediately obvious is that this device has been engineered to do a particular job. It's not intended to be used broadband, and it's not intended to; /archives//html/Amps/2005-05/msg00276.html (8,644 bytes)
188. [Amps] 811s for 30L-1 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 25 May 2005 15:26:23 +0100; I'm sure this has been covered in the past, so please excuse me for asking again and not trawling the achives. A friend wants to buy in some spare tubes for his 30L-1. Readily available brands seem t; /archives//html/Amps/2005-05/msg00285.html (6,438 bytes)
189. Re: [Amps] 4xc250b Valve Bases - Screen ring capacity - HF v VHF (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 05 Jun 2005 17:44:25 +0100; As far as I'm aware, the SK620 is the only base that works reliably at UHF with the '250. The SK620, and every other base I've ever met, works ok at VHF and below. Can you post a picture of the base; /archives//html/Amps/2005-06/msg00032.html (8,547 bytes)
190. Re: [Amps] 4xc250b Valve Bases - Screen ring capacity - HF v VHF (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 05 Jun 2005 17:45:43 +0100; As far as I'm aware, the SK620 is the only base that works reliably at UHF with the '250. The SK620, and every other base I've ever met, works ok at VHF and below. Can you post a picture of the base; /archives//html/Amps/2005-06/msg00033.html (8,271 bytes)
191. Re: [Amps] overvoltage (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 6 Jun 2005 09:12:37 +0100; I'll second that. I think that Tranzorb is Vishay trademark, but there's lots of companies manufacturing similar components. Watch out for the capacitance if it's critical factor. Steve _____________; /archives//html/Amps/2005-06/msg00047.html (6,967 bytes)
192. [Amps] 8873 replacement (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 09 Jun 2005 09:39:32 +0100; Has anyone investigated the practicality of removing the finned section from 8874 and replacing it with a solid mounting block? Thanks, Steve _______________________________________________ Amps mail; /archives//html/Amps/2005-06/msg00061.html (6,098 bytes)
193. Re: [Amps] questions on my tranformer test (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 12 Jun 2005 21:14:21 +0100; I think so. Remember that what you have measured is the rms secondary current - which defines the heating effect. The dc current you can end up with depends on several factors but is likely to be 30-; /archives//html/Amps/2005-06/msg00079.html (8,404 bytes)
194. Re: [Amps] copper or silver in tank circuit? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 16 Jun 2005 17:23:01 +0100; Not to mince words, it sounds nonsense to me. If that's the difference between a amp that's stable and unstable, them there's something much more fundamental needs fixing. I recall an article in RF D; /archives//html/Amps/2005-06/msg00126.html (8,113 bytes)
195. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 23 Jun 2005 09:45:00 +0100; Looks very nice. Do you know if it is/can be 'CE' marked? Thanks, Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/Amps/2005-06/msg00193.html (8,258 bytes)
196. Re: [Amps] 600 Watt Solid State Amp Project (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 27 Jun 2005 10:09:37 +0100; visit www.communication-concepts.com and work through the application notes (under the 'products' menu). If one of them suits, look for it on google to find examples people have built - there's quite; /archives//html/Amps/2005-06/msg00258.html (7,451 bytes)
197. Re: [Amps] New SGC Mini Lini Uses Class E Technology (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sun, 03 Jul 2005 07:52:50 +0100; Without going and refreshing my maths, I think the correlation between amplitude and phase matters at modulation frequencies, not to every rf cycle. Provided the delays through the audio and rf paths; /archives//html/Amps/2005-07/msg00015.html (8,078 bytes)
198. [Amps] 811As (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 13 Jul 2005 11:42:10 +0100; I've just received a bunch of Marshall 811As (for a friend who wanted spares for his 30L1). The boxes have what appears to be a radioactive warning symbol on them. If that's really what it is, can an; /archives//html/Amps/2005-07/msg00141.html (6,051 bytes)
199. [Amps] 4CX250 bases (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 15 Jul 2005 11:43:46 +0100; snip I've just put a couple of bases on hipot. One is a Johnson 124-110, the other is by AEI (quite common at UK rallies). Both look very similar to the SK600 family. On both, discernable current (<1; /archives//html/Amps/2005-07/msg00163.html (7,402 bytes)
200. Re: [Amps] LK500 Amp Problem (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 19 Jul 2005 10:03:47 +0100; I've never tried it, but how about plumber's PTFE tape? No worries about losses. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co; /archives//html/Amps/2005-07/msg00208.html (7,918 bytes)

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