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1. Re: [Amps] Tetrodes (score: 1): Author: "Michael J. Tubby G8TIC" <mike.tubby@thorcom.co.uk>; Date: Mon, 25 Jul 2005 02:02:34 +0100; All, I can't speak for the gas release, but I can speak as the owner of a 2 x 4CX250B 144MHz amp that used to "let go" randomly before I got a handle on the problem... I'm talking of 25+ years ago he; /archives//html/Amps/2005-07/msg00323.html (15,290 bytes)
2. Re: [Amps] HV cable for abt 200 degrees celsius? (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Tue, 13 Apr 2004 21:40:01 +0100; IMHO you don't need "special" insulation, use RG400 PTFE coax which is both double screened and easily capable of working at over 200 C... problem solved... I use RG400 for all my EHT leads with eith; /archives//html/Amps/2004-04/msg00089.html (9,154 bytes)
3. Re: [Amps] slow down circuits for 240v blower (score: 1): Author: "Michael J. Tubby B.Sc. (Hons) G8TIC" <mike.tubby@thorcom.co.uk>; Date: Wed, 19 Nov 2003 13:47:22 -0000; The trick that I use is a "motor run" capacitor in series - typical values are 1-15uF 440VAC rated. You can use a single cap or more than one if you want more than two speeds and switch across them.; /archives//html/Amps/2003-11/msg00267.html (10,603 bytes)
4. Re: [Amps] About single 4CX250b output power (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Wed, 29 Oct 2003 21:00:41 -0000; Page 65 of Eimac's "Care and feeding of power grid tubes" shows a selection guide for SSB service for which the 4CX250B is listed as being capable of 348W "useful power output" in AB1 with a 3rd orde; /archives//html/Amps/2003-10/msg00286.html (8,925 bytes)
5. Re: [Amps] Conditioning Spare Tubes After Storage (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Sun, 12 Oct 2003 19:55:29 +0100; ? Even for a gassy tetrode with handles, I have never found one that would magikly get mo' betta by operating the filament. The bottom-line seems to be: if there's gas, you'd better pass. However, i; /archives//html/Amps/2003-10/msg00098.html (9,249 bytes)
6. Re: [Amps] Tufnol rod (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Mon, 15 Sep 2003 22:16:48 +0100; Neil, is similar to Solid Resin Paper Board (SRBP) in properties. Personally I would use PTFE for the job you are describing, we (John G6YIN and myself) have used this on several 3-500Z, 8877 and GS3; /archives//html/Amps/2003-09/msg00133.html (10,025 bytes)
7. Re: [Amps] Input Impedance of GI-7BT Triode (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Sun, 14 Sep 2003 08:55:34 +0100; The easiest thing to do would be: a) to guess b) take it to a friendly RF engineer who has a network analyser Triodes. auto-tuner. _______________________________________________ Amps mailing list Am; /archives//html/Amps/2003-09/msg00118.html (7,904 bytes)
8. Re: [Amps] 4CX350A for VHF? (score: 1): Author: "Michael J. Tubby B.Sc. \(Hons\) G8TIC" <mike.tubby@thorcom.co.uk>; Date: Thu, 28 Aug 2003 16:36:52 +0100; make a little desktop amp for 2M out of them but a quick look at Eimac's web page at the specs make me wonder if this this might be a bad idea. Further, web searches produce a mixed bag of success/f; /archives//html/Amps/2003-08/msg00062.html (8,146 bytes)
9. [Amps] 4cx350f/j's (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Mon, 18 Nov 2002 00:47:10 -0000; Don't think so... The primary remains unchanged, as the for secondary with the '350FJ you need 26.5V @ 0.65A per tube while with the '350A you need 6.3V @ 2.8A - both about 17.5 watts (give or take).; /archives//html/Amps/2002-11/msg00303.html (8,713 bytes)
10. [Amps] 4cx350f/j's (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Sun, 17 Nov 2002 23:00:33 -0000; More volts, more turns => same VA = same size Mike; /archives//html/Amps/2002-11/msg00299.html (7,884 bytes)
11. [Amps] Re: 8877 dissp (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Wed, 13 Nov 2002 16:49:26 -0000; DISSIPATION Not so. Plate Dissipation is quite correct since the rest of the power goes into Antenna/Load Dissipation, thus: Pin = Plate Dissipation + Load Dissipation (assuming we ignore other triv; /archives//html/Amps/2002-11/msg00211.html (8,274 bytes)
12. [Amps] Why do people post to individual and AMPS ? (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Fri, 25 Oct 2002 11:19:21 +0100; David, Here is an example... you might care to study the headers... its because I (and I suspect many others) use MUAs like Outlook Excuse and when corresposonding in mailing lists use the 'reply to; /archives//html/Amps/2002-10/msg00259.html (8,798 bytes)
13. [Amps] Re: [Moon-Net] Looking for GPS-module to keep PC-clock correct. (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Thu, 24 Oct 2002 09:27:26 +0100; useful new port not is are are hence 100 ms solution. the is improved different I've only chip drift faster. adjustments is NTP is indeed a good solution. On unix the program is run as a service and; /archives//html/Amps/2002-10/msg00246.html (12,088 bytes)
14. [Amps] Failed 8877 (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Tue, 8 Oct 2002 10:31:37 +0100; filament other 'quality correct PA without Steve, Aren't these the tubes that when you invert them you hear a 'plink' type noise from inside as they disconnect? Mike; /archives//html/Amps/2002-10/msg00066.html (9,552 bytes)
15. [Amps] Henry 1KD-5 Bias (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Fri, 4 Oct 2002 16:00:03 +0100; I run single 3-500 amps with around 70-90mA depending on HT, etc. Assuming that the tube is good, check the heater volts are in spec. then if they are check the voltage acorss the bias zener. If you; /archives//html/Amps/2002-10/msg00025.html (7,736 bytes)
16. [Amps] Question To the guru's (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Sun, 22 Sep 2002 12:37:04 +0100; of Unless it is a question to something belonging to the guru, like "a question to the guru's sidekick" or a question to many sidekicks of many gurus, like "a question to the gurus' sidekicks" ... :-; /archives//html/Amps/2002-09/msg00166.html (7,492 bytes)
17. [Amps] Bird thrulines (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Tue, 17 Sep 2002 09:24:36 +0100; I thought that the standard Bird 43 meter was 30uA at 1350 ohms, but anyway... surely the problem you have Conrad is easily fixed with a couple of external resistors... LZ2US's meter is too sensitive; /archives//html/Amps/2002-09/msg00112.html (9,216 bytes)
18. [Amps] Computer Grade Electrolytic Capacitors vs. Radial (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Wed, 4 Sep 2002 21:11:18 +0100; To: <amps@contesting.com> a how Whether they're so-called "computer grade" or not probably isn't the issue... its the ripple current rating and temprature rating that are important, as Steve implies.; /archives//html/Amps/2002-09/msg00029.html (10,276 bytes)
19. [Amps] Use of 60Hz blowers on 50Hz mains for cooling ceramic triodes/tetrodes (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Tue, 13 Aug 2002 20:43:35 +0100; All, As I recently posted, my Commander-II amp went up in smoke after an extended period operating WSJT meteor scatter during Perseids, even though I was running it at under half max power. I've now; /archives//html/Amps/2002-08/msg00126.html (9,863 bytes)
20. [Amps] Commander-II 144MHz amp PSU woes (and Tempo 2002A) (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Sun, 11 Aug 2002 19:57:45 +0100; Yes, I know that hence why I said "suspected" - one thing it isn't is short to ground - checked that... but it does blow a 10A fuse in about 1-2 seconds :-( And they are...? Exactly what I thought, h; /archives//html/Amps/2002-08/msg00110.html (13,304 bytes)

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