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201. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 02 Sep 2006 07:46:15 +0100; I saw brief glimpses of a signal somewhere close to the tuned frequency (7MHz), which I assume was ringing in the whole tank circuit. Steve _______________________________________________ Amps mailin; /archives//html/Amps/2006-09/msg00028.html (9,918 bytes)
202. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 02 Sep 2006 15:23:32 +0100; It does to me when I think about the time it takes to go from conduction to cutoff with the usual bias switching in a g-g amp. Steve _______________________________________________ Amps mailing list; /archives//html/Amps/2006-09/msg00034.html (11,500 bytes)
203. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 03 Sep 2006 13:15:08 +0100; It's not. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00054.html (10,764 bytes)
204. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 03 Sep 2006 13:48:53 +0100; I think Monsieur Fourier explains it better than I can. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00055.html (11,427 bytes)
205. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 04 Sep 2006 08:21:57 +0100; Fourier's ideas don't explain it? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00064.html (11,084 bytes)
206. Re: [Amps] Cooling for GI-7B triodes. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 05 Sep 2006 08:12:19 +0100; I think cooling is most effective if air flows along rather than across the fins although transverse cooling seems to work fine in this amp: http://www.nd2x.net/w4emf-MLA.html although there's a note; /archives//html/Amps/2006-09/msg00090.html (7,851 bytes)
207. Re: [Amps] Henry 3K-A Step Start Resitor Cone (score: 1): Author: "Steve Thompson" <g8gsq@eltac.co.uk>; Date: Wed, 6 Sep 2006 15:00:36 +0100; The ones like a stretched spring wound in a spiral on a ceramic former make great glitch resistors - no problem with voltage breakdown, current capacity or dissipation in normal use. The ones I have; /archives//html/Amps/2006-09/msg00121.html (7,348 bytes)
208. Re: [Amps] Kilovac HC-2 Mounting Nut (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 15 Sep 2006 11:38:26 +0100; In metric thread designation, the second part defines the pitch - in this case 1.5mm. Standard M14 is 2mm pitch, and there are fine pitch versions of 1.25mm (metric spark plug) and 1.5mm. The likelyh; /archives//html/Amps/2006-09/msg00201.html (8,043 bytes)
209. Re: [Amps] Bird 43 meter (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 19 Sep 2006 09:43:35 +0100; 1400 ohms Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00219.html (6,351 bytes)
210. Re: [Amps] Bird 43 meter (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 20 Sep 2006 07:32:08 +0100; For info, the 1400 ohms I quoted was the spec. for the meter that came from Bird when the UK rep asked me to design a power sensor to replace one that had been discontinued. Steve ___________________; /archives//html/Amps/2006-09/msg00242.html (7,340 bytes)
211. Re: [Amps] HV Turn On Delay (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 27 Sep 2006 08:07:35 +0100; As I understand it, the danger is drawing current before the cathode is fully heated up - if you do, all the current flows out of the spots that are hottest, and this can mean the current density is; /archives//html/Amps/2006-09/msg00318.html (6,773 bytes)
212. Re: [Amps] off topic but here goes (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 28 Sep 2006 07:55:29 +0100; Screen printing stencils are produced photographically, my local guy takes disc files and has a fancy printer to make the artwork, and I get charged around $70 for a permanent screen. I have also see; /archives//html/Amps/2006-09/msg00334.html (6,909 bytes)
213. Re: [Amps] off topic but here goes (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 28 Sep 2006 12:13:46 +0100; I know what you mean. Something that didn't come to mind earlier - check out craft and marquetry suppliers. Modern custom marquetry is laser cut, and a thin veneer could be useable as a stencil. I'd; /archives//html/Amps/2006-09/msg00336.html (7,533 bytes)
214. Re: [Amps] Bad tubes from Ebay (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 28 Sep 2006 22:29:50 +0100; Just a minor point - I think there's no BeO in these (or most other external anode) tubes. The ceramic is Alumina - razor sharp if broken, but otherwise harmless. One exception which you might come; /archives//html/Amps/2006-09/msg00345.html (7,666 bytes)
215. Re: [Amps] HP436A power meter help needed (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 01 Oct 2006 19:28:23 +0100; The 8481B will work fine without the attenuator but the meter reading will be wrong and you will have to work out your own calibration. The attenuator part is just a plain simple attenuator. steve __; /archives//html/Amps/2006-10/msg00004.html (6,808 bytes)
216. Re: [Amps] Testing amp with no air flow (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 19 Oct 2006 14:39:17 +0100; If the only adjustment you need to make is to the heater voltage, add a couple of feedthroughs or similar to the cathode compartment wall and connect them to the heater via 10k resistors. Using a DVM; /archives//html/Amps/2006-10/msg00198.html (8,154 bytes)
217. Re: [Amps] 3CPX vs 3CX tubes (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 21 Oct 2006 07:31:41 +0100; We ran a 3CPX1500 in a 2m contest station for 15 years or so - it gave excellent linearity. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co; /archives//html/Amps/2006-10/msg00221.html (7,191 bytes)
218. [Amps] Transistor supplier (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 30 Oct 2006 22:46:33 +0000; Apologies for this being sort of off topic, although the transistors in question are rf power devices. An outfit called Stealth Components have come up with some obsolete Motorola devices which are v; /archives//html/Amps/2006-10/msg00325.html (6,568 bytes)
219. Re: [Amps] Henry 3K trouble (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 31 Oct 2006 23:15:51 +0000; I can't believe how cheap 25 or 35A bridges are. Use the two ac terminals and you get two diodes in series back to back, with a rating that will laugh at any glitch current. Steve ___________________; /archives//html/Amps/2006-11/msg00018.html (9,103 bytes)
220. Re: [Amps] DIN Connector (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 31 Oct 2006 22:56:57 +0000; I guess you're looking for the '7/16' connector - not inches, but 7mm inner conductor, 16mm outer. All the major manufacturers have product lines. A big part of the design was to minimise IMD in base; /archives//html/Amps/2006-11/msg00021.html (7,064 bytes)

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