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

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321. [AMPS] a sticky issue. (score: 147): 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)
322. [AMPS] a sticky issue. (score: 147): 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)
323. [AMPS] Screen protection WHAAAATTTTTT!!!! (score: 147): 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)
324. [AMPS] start (score: 147): 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)
325. [AMPS] Re: G2DAF Amps Circuit (score: 147): 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+0100; The original G2DAF articles appeared in 'Radio Communication' and are reproduced on my web site for historical reference. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for R; /archives//html/Amps/2000-10/msg00564.html (8,952 bytes)
326. [AMPS] G2DAF Circuit (score: 147): 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)
327. [AMPS] G2DAF Amplifier etc. (score: 147): 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)
328. [AMPS] Who's who (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 2 Sep 2000 08:59:29 +0100; Yup, that's the AMPS we know and love! 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.contesting.com/; /archives//html/Amps/2000-09/msg00056.html (7,126 bytes)
329. [AMPS] source of remote drive motors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Sep 2000 22:02:13 +0100; I hereby so testify. Took a looong time to remove all the aluminum I didn't want, to leave behind the very little that I did. Peter was very patient... 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'; /archives//html/Amps/2000-09/msg00118.html (7,330 bytes)
330. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Sep 2000 22:08:45 +0100; That is no proof of a parasitic. The grid current meter is in the return path from chassis to B-minus, so a DC arc from B+ to chassis will pin that meter with no RF involvement whatsoever. 73 from Ia; /archives//html/Amps/2000-09/msg00119.html (8,995 bytes)
331. [AMPS] Big muthah soldering iron (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Sep 2000 17:04:06 +0100; Ouch! There is also an Australian low-voltage iron that generates the heat by pressing a small pill of solid carbon right against the back of the copper bit. That's pretty effective too, especially f; /archives//html/Amps/2000-09/msg00151.html (9,099 bytes)
332. [AMPS] heating tubes.... (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Sep 2000 20:06:34 +0100; The reasons for observing low gas currents if you delay more than a few seconds after the event have been explained many times - "it's the gettering action". Does testing 3-500Zs cause amnesia? 73 fr; /archives//html/Amps/2000-09/msg00154.html (8,164 bytes)
333. [AMPS] heating tubes.... (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 7 Sep 2000 10:05:39 +0100; If there is a chemically active surface (hot anode), gettering in a tube the size of a 3-500Z occurs on a timescale of seconds. It only takes a very small release of trapped gas impurities to trigger; /archives//html/Amps/2000-09/msg00198.html (9,005 bytes)
334. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 7 Sep 2000 14:16:02 +0100; This ties in exactly with what Tom was saying. If you build HF amplifiers with the kind of "VHF awareness" that Peter has, you don't have many problems with unexpected VHF resonances. On the other ha; /archives//html/Amps/2000-09/msg00205.html (10,283 bytes)
335. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 11 Sep 2000 12:57:46 +0100; Failure of that transistor to survive a glitch/arc/parastic/flashover/whatever is a simple DC design fault that can be cured by a 10K resistor. I don't think that's a good reason to remove grid curre; /archives//html/Amps/2000-09/msg00454.html (9,668 bytes)
336. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 11 Sep 2000 14:01:04 +0100; For the benefit of anyone who joined AMPS since the N7WS Incident, here's a short run-down. Wes Stewart, N7WS, tried to help resolve the disagreements about the relative virtues of conventional R-L p; /archives//html/Amps/2000-09/msg00455.html (10,393 bytes)
337. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 11 Sep 2000 17:19:56 +0100; Thanks for the correction. People were confused because you were unaware that "Rs" always means "series equivalent resistance". You actually believed that the Rs values quoted by Wes *were* what you; /archives//html/Amps/2000-09/msg00474.html (12,180 bytes)
338. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 11 Sep 2000 17:25:33 +0100; We may be talking about different transistors. Let's start again. Where in the circuit is the transistor that you say burns out in a glitch? Why do you believe that it should be removed, if that also; /archives//html/Amps/2000-09/msg00475.html (10,518 bytes)
339. [AMPS] Blown TL922A... What to do? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 11 Sep 2000 21:49:00 +0100; I don't understand that circuit idea - who uses it? It does seem a strange way of protecting against excessive grid current, under "normal" conditions of excessive RF drive, incorrect loading or low; /archives//html/Amps/2000-09/msg00491.html (11,117 bytes)
340. [AMPS] Electrolytics - info needed pse (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 12 Sep 2000 10:16:42 +0100; Does anyone know the ripple current rating of Nippon Chemi-Con 330uF 450V electrolytics, type UCC 51F07L 63 - or where to find it? Thanks! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice; /archives//html/Amps/2000-09/msg00525.html (7,044 bytes)

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