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161. Re: [Amps] a common topic here tspa (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 12:15:00 +0100; Could they get there after the anode voltage is removed? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-04/msg00165.html (10,279 bytes)
162. Re: [Amps] Solid State Amps (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 17:32:40 +0100; I think your fears are unfounded. Plenty of melted gold, maybe not tiny balls, more like puddles.... But magic will still be needed. Absolutely, categorically, cast iron guaranteed! In fact, folks wi; /archives//html/Amps/2005-04/msg00177.html (8,543 bytes)
163. Re: [Amps] Grid resonance (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 18:00:49 +0100; If someone can provide the fixture, I'll happily measure the impedances. I can report that attaching small and large sheets of metal to the grid ring while measuring the cathode-grid impedance makes; /archives//html/Amps/2005-04/msg00178.html (8,652 bytes)
164. Re: [Amps] Grid resonance (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 19:57:34 +0100; Yes - I'm not sure if it's relevant that the impedance goes 'short' at that frequency - I figure it's the feedthrough (feedback if you prefer) figures that matter more. Grid and other 'resonances' al; /archives//html/Amps/2005-04/msg00183.html (8,410 bytes)
165. Re: [Amps] Solid State Amps (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 21:39:11 +0100; Did I mention resistance wire? Magic comes in many forms. Some of these include people who don't know better believing in nonsense, people who should know better believing in nonsense and people who; /archives//html/Amps/2005-04/msg00186.html (9,736 bytes)
166. Re: [Amps] Solid State Amps (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 21:47:01 +0100; There's no shortage of 'parasites', they just mutate into different forms. When an apps engineer I remember working on a customer's amp which would hoot given a particular combination of drive and lo; /archives//html/Amps/2005-04/msg00188.html (9,306 bytes)
167. Re: [Amps] Solid State Amps (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 8 Apr 2005 21:48:04 +0100; I'd forgotton that one. Shame on me. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-04/msg00189.html (8,576 bytes)
168. Re: [Amps] Solid State Amps (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 9 Apr 2005 07:34:26 +0100; Last time I checked, a few years ago, a gold reclaim recycler would give about $1 for a dud rf device (we were supplying them by the bucketload). Steve _______________________________________________; /archives//html/Amps/2005-04/msg00196.html (8,675 bytes)
169. Re: [Amps] paper on Haarp (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 14 Apr 2005 21:29:18 +0100; I'm sure I'm not speaking only for myself in saying 'don't worry about it'. For a buzz, that has to beat busting a pileup :-) Can you hear me now....... 73, Steve ____________________________________; /archives//html/Amps/2005-04/msg00286.html (6,679 bytes)
170. Re: [Amps] Intermittent Bird element (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 17 Apr 2005 07:33:57 +0100; If you haven't already, try cleaning and check the tension on the spring contact in the hole where the slug fits. Steve _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2005-04/msg00318.html (6,752 bytes)
171. Re: [Amps] Led display problem (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 19 Apr 2005 09:20:26 +0100; Opto isolators? Some have a reasonable linear range, or you can use a second one and an opamp to correct any non-linearities. With any of the suggested solutions, you'll need to take care to protect; /archives//html/Amps/2005-04/msg00390.html (7,736 bytes)
172. Re: [Amps] Fwd:Re: More Rumors (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 22 Apr 2005 16:38:24 +0100; If it's any help, ARF444/445 (300V,300W each) are about $55ea. in the Farnell catalogue in the UK - you should find them at Newark in the US. Double the power usually costs more than double the price; /archives//html/Amps/2005-04/msg00445.html (7,968 bytes)
173. Re: [Amps] APT ARF-1505 FET's for HF amps (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 22 Apr 2005 17:34:33 +0100; If the design allows for individual bias I reckon you don't need matched pairs of MRF150s - saving 5-10% brings the price comparison very close. Personally, I'd probably go for the MRF150s. I'm not k; /archives//html/Amps/2005-04/msg00453.html (6,918 bytes)
174. Re: [Amps] RE : Led display problem (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 23 Apr 2005 08:58:28 +0100; I think there are many opto couplers that have enough linearity without feedback to give you 5% or better accuracy and linearity, which is as good as a cheap meter movement. I'm also sure I've seen l; /archives//html/Amps/2005-04/msg00462.html (8,296 bytes)
175. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 24 Apr 2005 18:51:45 +0100; I've not looked for the data, but is the 225W rating with forced air cooling as opposed to natural convection? Steve _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2005-04/msg00486.html (8,572 bytes)
176. Re: [Amps] Resistors (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 26 Apr 2005 11:13:05 +0100; I'm with you on cheap fans. On the other hand, in 1990 I build 16 class A amplifiers for a tunnel distribution system - they dissipate 150W continuously and needed fan cooling. I chose a Papst 24V ba; /archives//html/Amps/2005-04/msg00546.html (8,301 bytes)
177. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 28 Apr 2005 07:49:07 +0100; But 4000^2/2000000 = 8W 10 x 2W still won't have enough safety margin though, and voltage rating will be a problem. Steve _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2005-04/msg00592.html (8,126 bytes)
178. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 28 Apr 2005 07:58:49 +0100; Sorry! Getting two trains of thought mixed up, and it's early in the morning. Please ignore that one. 0.5W resistors with 3500V dc rating are readily available and cheap - maybe not well suited to th; /archives//html/Amps/2005-04/msg00593.html (8,602 bytes)
179. Re: [Amps] Plate transformer current unknown (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 29 Apr 2005 17:07:04 +0100; You can short the secondary with an ac ammeter and apply primary volts with a variac. Increase the secondary current in 100mA steps until the transformer is a hot as you are happy with - allow sever; /archives//html/Amps/2005-04/msg00618.html (8,285 bytes)
180. Re: [Amps] 4CX1000A for SSB?? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 3 May 2005 10:33:52 +0100; The results stack up fairly well with the 144MHz figures form DJ4GC (VHF Communications, 4/85). In Carsten's amp the 5th and 7th order drop off a bit faster. Steve ___________________________________; /archives//html/Amps/2005-05/msg00018.html (7,354 bytes)

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