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221. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 10:39:18 +0000; This keeps on coming around. OE5JFL now has an English-language version of his thyristor crowbar on his own site, with readable schematics: http://www.qsl.net/oe5jfl/flashover.htm That solution is be; /archives//html/Amps/2000-11/msg00396.html (9,221 bytes)
222. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 17:42:23 +0000; The main advantage is in reducing the risk to an expensive tube. That's why I haven't got around to building OE5JFL's circuit yet - GS35Bs are cheap! On the other hand, many UHF QRO operators use TV; /archives//html/Amps/2000-11/msg00410.html (11,942 bytes)
223. [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 28 Nov 2000 17:30:56 +0000; Nobody but you imagined it was. But *some* HV power supplies with high-rated mains fuses will keep going for long enough to burn out the glitch resistor... and then the HV pops up again. 73 from Ian; /archives//html/Amps/2000-11/msg00411.html (10,102 bytes)
224. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 29 Nov 2000 07:58:46 +0000; The 10 ohm resistor in the negative return has many of the functions of the glitch resistor, along with the inductor in the B+ lead. Those two components limit the peak surge current, and are also wh; /archives//html/Amps/2000-11/msg00425.html (11,751 bytes)
225. [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 29 Nov 2000 07:20:21 +0000; I agree with you that it's bad practice to use a small glitch resistor instead of an HV fuse. In the case I'm thinking of, the glitch resistor was sensibly rated for power dissipation in normal opera; /archives//html/Amps/2000-11/msg00426.html (11,034 bytes)
226. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 29 Nov 2000 20:40:41 +0000; You obviously haven't even looked at the circuit we're talking about... or if you have, you haven't understood it. I don't know which alternative is worse. 73 from Ian G3SEK Editor, 'The VHF/UHF DX B; /archives//html/Amps/2000-11/msg00439.html (10,157 bytes)
227. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 30 Nov 2000 09:43:08 +0000; Does it? The current around the loop is the same, regardless of whether the glitch resistor is connected to the top of the capacitor stack (B+) or the bottom (B-minus). If we keep chassis potential a; /archives//html/Amps/2000-11/msg00446.html (11,816 bytes)
228. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 30 Nov 2000 19:19:13 +0000; You're absolutely right, it won't limit current if you put it there... but that wasn't where I meant. Referring to "Figure 2" on your web site, leave the meters and diodes exactly where they are. Mov; /archives//html/Amps/2000-11/msg00463.html (11,224 bytes)
229. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 30 Nov 2000 22:13:42 +0000; The glitch diodes belong in the right-hand group of components, near the meters. There should be NO connection between the left-hand group of components (capacitor stack and HV rectifiers) and ground; /archives//html/Amps/2000-11/msg00469.html (9,246 bytes)
230. [AMPS] Bird meters (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 2 Oct 2000 13:46:46 +0100; FWIW, I measured the current through a Bird 43 meter for a series of indicated power levels (no RF involved, only a DC current source), and threw it all into Excel. Got a nice smooth curve, and Excel; /archives//html/Amps/2000-10/msg00050.html (10,010 bytes)
231. [AMPS] amp project: 4-400s X 4 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 8 Oct 2000 16:48:00 +0100; Nice idea! You'll definitely need a bleed, because the results of the screen driving current back into a regulated switch-mode supply might be a little, er, unpredictable. One problem is that a volta; /archives//html/Amps/2000-10/msg00124.html (10,115 bytes)
232. [AMPS] Switches (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 13 Oct 2000 07:34:51 +0100; I wouldn't say that the screen supply in the 91/99B is well regulated (only zeners) so that amp doesn't necessarily show us the best IMD performance the 4CX800 is capable of. Likewise Eimac's recomme; /archives//html/Amps/2000-10/msg00273.html (10,443 bytes)
233. [AMPS] a sticky issue. (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 15 Oct 2000 23:48:16 +0100; Can anyone think of a *worse* way to protect the screen of a tetrode? 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on; /archives//html/Amps/2000-10/msg00355.html (9,361 bytes)
234. [AMPS] a sticky issue. (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 16 Oct 2000 14:24:26 +0100; I knew you wouldn't disappoint me! Yes, I see... 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.conte; /archives//html/Amps/2000-10/msg00376.html (9,255 bytes)
235. [AMPS] Screen protection WHAAAATTTTTT!!!! (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 17 Oct 2000 17:20:43 +0100; The SCRs don't need to be very large - the B+ surge resistor limits the possible current to 40-60A, which even a TO-220 SCR can handle. One SCR can handle the screen, if the rest of the screen supply; /archives//html/Amps/2000-10/msg00443.html (9,187 bytes)
236. [AMPS] start (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 23 Oct 2000 16:24:38 +0100; The tube data sheet says you can, although when I tried it, the cathode still seemed to be warming up after 60 seconds. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for Rad; /archives//html/Amps/2000-10/msg00521.html (7,475 bytes)
237. [AMPS] Re: G2DAF Amps Circuit (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 26 Oct 2000 07:05:59 +0100; The original G2DAF articles appeared in 'Radio Communication' and are reproduced on my web site for historical reference. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for R; /archives//html/Amps/2000-10/msg00564.html (8,952 bytes)
238. [AMPS] G2DAF Circuit (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 26 Oct 2000 20:10:25 +0100; The real G2DAF circuit is not cathode driven - it's grounded cathode, passive grid. (Was the "G2DAF" design that you built and tested?) The one-and-only *real* G2DAF design is the one in his original; /archives//html/Amps/2000-10/msg00579.html (9,283 bytes)
239. [AMPS] G2DAF Circuit (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 27 Oct 2000 07:32:57 +0100; The problem with the white noise test is that, like the two-tone test, it does not test the effect of variations at the word or syllable rate. If the only test is at high frequencies, the capacitors; /archives//html/Amps/2000-10/msg00607.html (10,730 bytes)
240. [AMPS] G2DAF Amplifier etc. (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 29 Oct 2000 08:47:14 +0000; Sorry, but none of that says anything about IMD. RSGB handbook editors tend to favour whatever was more recently published in the monthly magazine. It implies no technical judgement whatever. (The 81; /archives//html/Amps/2000-10/msg00649.html (7,979 bytes)

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