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References: [ +from:Ian: 2098 ] [ White: 4243 ]

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281. [AMPS] grounded grid configuration, grid 1 location (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 21 Jan 2001 09:17:23 +0000; Corrections: Try http://www.ifwtech.com/g3sek/boards/tetrode/tetrode-3.htm I checked it this time around... Also I did mean the 30S-1. Thanks for the corrections! 73 from Ian G3SEK Editor, 'The VHF/U; /archives//html/Amps/2001-01/msg00536.html (8,114 bytes)
282. [AMPS] grounded grid configuration, grid 1 location (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 21 Jan 2001 11:28:02 +0000; Big mistake - like reminding yourself about an itch that you were hoping to forget! Application Note 4, with schematics that make everything much clearer, is now downloadable as a PDF from http://www; /archives//html/Amps/2001-01/msg00537.html (8,445 bytes)
283. [AMPS] Protection in cathode not plate? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 21 Jan 2001 18:10:37 +0000; I just tried a SPICE transient model for the effects of an internal tube arc from anode to grid, from a typical B+ supply with 25uF charged to 3kV, with a 47 ohm glitch resistor. With typical "SB-220; /archives//html/Amps/2001-01/msg00542.html (9,085 bytes)
284. [AMPS] Re: SPICE model (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 22 Jan 2001 22:48:02 +0000; Like any other model, they'll let you down if you trust them too much. Having been involved in computer modeling (literally from atomic to global scale) for about 30 years, I've made most of the poss; /archives//html/Amps/2001-01/msg00565.html (7,958 bytes)
285. [AMPS] WTB FILAMENT TRANSFORMER (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 23 Jan 2001 07:32:48 +0000; All these transformer messages have a heavy irony core. 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://ww; /archives//html/Amps/2001-01/msg00575.html (7,978 bytes)
286. [AMPS] New Pix (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 26 Jan 2001 07:27:14 +0000; Steve mentioned the PDF file of the original G2DAF article on my site. Please can you update the URL, Larry? The old site mentioned by Steve is now closed, and I've re-located the file on my new site; /archives//html/Amps/2001-01/msg00645.html (7,695 bytes)
287. [AMPS] Super High Frequency Reflector? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 26 Jan 2001 07:35:35 +0000; 1. The MOON-NET EME list, subscribe via http://www.nlsa.com/help/moon-net-help.html 2. The Waveguide list (rather quiet). Go to www.e-groups.com and search for Waveguide to subscribe. 3. There are ce; /archives//html/Amps/2001-01/msg00646.html (7,962 bytes)
288. [AMPS] High Power on 70cm - Possible? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 28 Jan 2001 15:09:49 +0000; A bit of both. For a ready-made amp you can go to Henry, or you can go to a number of hams who build amps for sale, for example Lunar-Link (K1FO - www.lunarlink.com). These generally use 3CX800s at 2; /archives//html/Amps/2001-01/msg00661.html (9,390 bytes)
289. [AMPS] linear amps (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 29 Jan 2001 20:28:22 +0000; For a schematic, see page 9 of: http://www.ameritron.com/ameritron/manuals/pdf/al811h.pdf In contrast, the FL-2100Z "neutralization" is very hit-and-miss, because the amplitude and phase of feedback; /archives//html/Amps/2001-01/msg00689.html (9,388 bytes)
290. [AMPS] neutralizing (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 31 Jan 2001 07:58:16 +0000; To be fair, these are all tubes of modern construction with grid rings and very short internal connections. Effective external grounding or bypassing should (and does) avoid the need for neutralizati; /archives//html/Amps/2001-01/msg00762.html (9,677 bytes)
291. [AMPS] neutralizing (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 31 Jan 2001 18:11:02 +0000; OK, having reached the end of the working day and now put in some numbers for typical reactances, I see your point. The T-network involving the grid inductance is a minor effect compared with the sim; /archives//html/Amps/2001-01/msg00776.html (8,968 bytes)
292. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 1 Dec 2000 07:44:02 +0000; No - the problem we're trying to protect against is not a surge into the caps (a step start protects against that) but a surge *out* of the caps, triggered by the tube going almost short-circuit. The; /archives//html/Amps/2000-12/msg00005.html (10,070 bytes)
293. [AMPS] ARRL CD rom question (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 18 Dec 2000 07:46:50 +0000; They vary. author/date search. Browse facilities were poor, and they made no use of the existing classified annual index. Text and picture quality is about as good as a fax. MS Windows only. readers.; /archives//html/Amps/2000-12/msg00266.html (8,232 bytes)
294. [AMPS] DC Filaments??? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 2 Nov 2000 08:01:25 +0000; In a push-pull stereo system, you MUST periodically swap the tubes around - left to right, push to pull - in order to even out the wear. Incorrect adjustment of the stereo balance can cause premature; /archives//html/Amps/2000-11/msg00018.html (9,133 bytes)
295. [AMPS] Glitch protection (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 3 Nov 2000 07:35:51 +0000; [lots of ingenious stuff] Quite so. The ultimate test is to see whether you can crowbar the HV supply with another very thin fuse wire and have that wire NOT blow before the supply is shut down. For; /archives//html/Amps/2000-11/msg00044.html (8,289 bytes)
296. [AMPS] Two Tone 2000 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 7 Nov 2000 13:50:52 +0000; That sounds like a great idea, especially for those of us who don't have facilities for a two-signal test using separate CW transmitters. A number of people have suggested "three-tone" testing, but I; /archives//html/Amps/2000-11/msg00085.html (9,161 bytes)
297. [AMPS] advice on and old SB-220 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 11 Nov 2000 08:11:53 +0000; Quite right, no miracles are involved. If a transmitting tube like a 3-500Z that has been in store for a long time is found to be "gassy", the possibilities for recovery depend on where the gas came; /archives//html/Amps/2000-11/msg00105.html (9,350 bytes)
298. SV: [AMPS] advice on an old SB-220 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 11 Nov 2000 08:35:19 +0000; Small-signal tubes are gettered by a chemically reactive metal film (usually barium, mostly) on the inside of the glass. You can see the "silver" film inside, usually at the top. This operates at low; /archives//html/Amps/2000-11/msg00106.html (12,718 bytes)
299. [AMPS] advice on and old SB-220 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 13 Nov 2000 17:04:17 +0000; That's like saying "heating causes your house to burn down". Heating causes *all* tube materials to release stored gas, if the temperature is high enough. That's why they are heated during manufactur; /archives//html/Amps/2000-11/msg00127.html (9,031 bytes)
300. [AMPS] 240VAC Amplifier Wiring (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 15 Nov 2000 07:38:59 +0000; There are two sides to separating neutral from ground. One is in the mains supply and cable, but the other is in the equipment. The rule is that "neutral is only for power", and "ground is only for g; /archives//html/Amps/2000-11/msg00150.html (10,784 bytes)

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