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References: [ +from:Ian: 2095 ] [ White: 4243 ]

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381. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): 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)
382. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 147): 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)
383. [AMPS] Bird meters (score: 147): 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)
384. [AMPS] amp project: 4-400s X 4 (score: 147): 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)
385. [AMPS] Switches (score: 147): 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)
386. [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)
387. [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)
388. [AMPS] AMERITRON AL80A (score: 6): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Tue, 17 Oct 2000 09:14:43 +0200; Rich, are you of the opinion that gettering is a false concept? In any case, 1400 deg C seems be to mighty hot (white hot?) Ian ZS6BTE -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: a; /archives//html/Amps/2000-10/msg00424.html (9,409 bytes)
389. [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)
390. [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)
391. [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)
392. [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)
393. [AMPS] G2DAF Circuit (score: 156): 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)
394. [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)
395. [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)
396. [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)
397. [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)
398. [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)
399. [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)
400. [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)

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