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321. [AMPS] Runaway amp (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 20 Feb 2001 19:59:42 +0000; Good point - and also, how accurately are you measuring the grid and screen voltages? Are you using a DVM or do the voltages only *look* kind-of constant on an analog meter? If you had not said that; /archives//html/Amps/2001-02/msg00277.html (8,609 bytes)
322. [AMPS] runaway amp. (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 23 Feb 2001 00:28:24 +0000; W0YR will be off the list for a few weeks, so maybe we have to leave it until he can make some more tests. The real puzzle is that the RF output drifts UPwards, which is quite unusual. 73 from Ian G3; /archives//html/Amps/2001-02/msg00304.html (8,523 bytes)
323. [AMPS] k2riw 2m amp! (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 25 Feb 2001 08:58:08 +0000; ... and more IMD. AFAIK, the most complete information on linear operation of 4CX250Bs is the chapter by GW4FRX in 'The VHF/UHF DX Book'. Very briefly: Va 2000V, Vg2 350V, Vg1 about -55V (adjust for; /archives//html/Amps/2001-02/msg00328.html (9,908 bytes)
324. [AMPS] K2RIW Amps (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 25 Feb 2001 09:01:52 +0000; In class B or C with a lot of drive, you can indeed get that kind of power from a pair of 4CX250Bs - but that's CW, not linear. The practical limit for good linearity is about 500W in strict class AB; /archives//html/Amps/2001-02/msg00329.html (8,402 bytes)
325. [AMPS] K2RIW Amps (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 25 Feb 2001 19:45:11 +0000; "The linearity was good"... for California. Here in Europe you'd find your coax cut. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g; /archives//html/Amps/2001-02/msg00333.html (8,640 bytes)
326. [AMPS] K2RIW Amps (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 26 Feb 2001 06:42:58 +0000; ... or the sincerest form of signal quality report. 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.co; /archives//html/Amps/2001-02/msg00345.html (9,154 bytes)
327. [AMPS] Output Pulse from ICOM 706 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 4 Jan 2001 15:09:59 +0000; They seem to have solved it on the IC-746. That's as far as I can see, on a non-storage scope but with the brightness turned way up to make even a very short spike visible. It's certainly very visibl; /archives//html/Amps/2001-01/msg00133.html (10,435 bytes)
328. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 5 Jan 2001 18:53:38 +0000; Oh no it isn't. That page has been there since 1996. The idea was that the world should volunteer to update C&F at no expense to Eimac. Mistake #1 was to keep the existing chapter structure - but tim; /archives//html/Amps/2001-01/msg00177.html (9,658 bytes)
329. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 5 Jan 2001 19:34:25 +0000; Sadly so. 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/FAQ/amps Submissions: amps@co; /archives//html/Amps/2001-01/msg00179.html (9,450 bytes)
330. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 151): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 7 Jan 2001 00:06:00 +0000; Please don't get sucked into Rich's opportunistic personal attacks against Eimac staff. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co; /archives//html/Amps/2001-01/msg00223.html (10,734 bytes)
331. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 151): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 7 Jan 2001 10:07:21 +0000; He has now told us all... again. I agree that Eimac <as a company> made a mistake over C&F, and continues to make a mistake in not pulling those pages and re-thinking what needs to be done. But a mis; /archives//html/Amps/2001-01/msg00235.html (11,047 bytes)
332. [AMPS] Output Pulse from ICOM 706 (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 15 Jan 2001 14:30:10 +0000; The problem with reviews is that they can only test systematically for *known* aspects of performance. It's much less certain whether they pick up any other defects that are specific to one particula; /archives//html/Amps/2001-01/msg00364.html (11,517 bytes)
333. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 147): 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)
334. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 147): 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)
335. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 147): 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)
336. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 147): 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)
337. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 147): 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)
338. [AMPS] Clipperton L amplifier (score: 147): 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)
339. [AMPS] grounded grid configuration, grid 1 location (score: 147): 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)
340. [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)

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