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181. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 17 Jan 2001 11:32:13 +0000; You're right, it doesn't necessarily. There are just two things to take care of, if the glitch resistor is in the negative lead: 1. To be sure that the resistor is the *only* path back to the HV-minu; /archives//html/Amps/2001-01/msg00409.html (10,709 bytes)
182. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 18 Jan 2001 07:46:24 +0000; The negative end of the filter cap can easily be insulated to those standards - you just have to remember to do it. The cathode circuitry and filament transformer (assuming we're talking about GG tri; /archives//html/Amps/2001-01/msg00458.html (10,793 bytes)
183. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 18 Jan 2001 07:56:33 +0000; In this example, you cannot separate the problems caused by having too small a glitch resistor from those that *might* be caused by putting it in the B-minus return. How big is the resistor (wattage; /archives//html/Amps/2001-01/msg00459.html (11,444 bytes)
184. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 18 Jan 2001 16:35:59 +0000; Except to insulate *both* ends to full HV. A possible advantage of placing the glitch resistor in the negative return is that one end is always close to chassis potential. Stop and think again. The c; /archives//html/Amps/2001-01/msg00471.html (12,778 bytes)
185. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 18 Jan 2001 22:21:43 +0000; There wasn't one... but there is now. I just wasted an hour hacking some diagrams and text together, and the result is at http://www.ifwtech.com/g3sek/glitchres.htm The text is shown below (where <th; /archives//html/Amps/2001-01/msg00480.html (12,903 bytes)
186. [AMPS] Clipperton L amplifier (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 20 Jan 2001 00:27:32 +0000; There can be a problem of parallel resonance between the screen bypass capacitor and the self-inductance of a higher-value capacitor somewhere else in the screen supply circuit. For example, the self; /archives//html/Amps/2001-01/msg00516.html (12,870 bytes)
187. [AMPS] grounded grid configuration, grid 1 location (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 20 Jan 2001 23:33:07 +0000; We have to be a bit careful what we mean by "grounded" - either grounded to RF but biased at DC, or nailed directly to chassis ground. The applications where both grids are tied to chassis ground are; /archives//html/Amps/2001-01/msg00530.html (11,187 bytes)
188. [AMPS] grounded grid configuration, grid 1 location (score: 1): 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)
189. [AMPS] grounded grid configuration, grid 1 location (score: 1): 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)
190. [AMPS] Protection in cathode not plate? (score: 1): 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)
191. [AMPS] Re: SPICE model (score: 1): 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)
192. [AMPS] WTB FILAMENT TRANSFORMER (score: 1): 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)
193. [AMPS] New Pix (score: 1): 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)
194. [AMPS] Super High Frequency Reflector? (score: 1): 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)
195. [AMPS] High Power on 70cm - Possible? (score: 1): 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)
196. [AMPS] High Power on 70cm - Possible? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 29 Jan 2001 07:53:50 +0000; That's too strong. Although it's true that Steve has now changed to the 3CPX800, for many years before the 3CPX became readily available he and others used the 3CX successfully at 1500W on 432. Advic; /archives//html/Amps/2001-01/msg00679.html (9,718 bytes)
197. [AMPS] linear amps (score: 1): 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)
198. [AMPS] neutralizing (score: 1): 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)
199. [AMPS] neutralizing (score: 1): 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)
200. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): 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)

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