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1. [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)
2. [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)
3. [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)
4. [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)
5. [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)
6. [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)
7. [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)
8. [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)
9. [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)
10. [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)
11. [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 13:36:53 +0100; I have a Command Technologies Commander-II 3CX800 amp on 2m, well that is until last night operating WSJT in Perseids! Was running the amp at only about 350W o/p - derated for the 50% duty cycle (30s; /archives//html/Amps/2002-08/msg00106.html (9,963 bytes)
12. [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)
13. [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)
14. [Amps] Muffin Fan on Swan Mark 1 (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Sat, 27 Jul 2002 12:02:53 +0100; might I've been trying to find a blower powerful enough to blow my 4CX1000A out of it's socket for ages... perhaps the socket's faulty? Mike G8TIC; /archives//html/Amps/2002-07/msg00501.html (10,194 bytes)
15. [Amps] P600M diodes in HT supplies (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Fri, 3 May 2002 18:48:29 +0100; All, I use the fast-recovery version of the 1N5408, called the UF5408, originally intended for fast switching in switched-mode PSUs in my bigh HT supplies. You need no capacitors or resistors - just; /archives//html/Amps/2002-05/msg00021.html (9,602 bytes)
16. [Amps] Wanted: Dowkey DK-260N relay (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Fri, 12 Apr 2002 21:27:07 +0100; All, I'm looking for a Dowkey DK-260 DPDT RF relay with N-type connectors to replace the badly damaged DK-260 (SO239) unit on my otherwise fine Command Technologies Commander-II 144MHz amp. Anyone go; /archives//html/Amps/2002-04/msg00325.html (6,754 bytes)
17. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Mon, 4 Mar 2002 22:12:52 -0000; Paul, I've built several 8877 and 4CX1000A/1500B amplifiers and recommend a "blower" like the on Peter's suggesting also, I've had good results with the Airflow Developments 45CTL, have a look at: ht; /archives//html/Amps/2002-03/msg00052.html (11,212 bytes)
18. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Tue, 5 Mar 2002 19:44:31 -0000; would had. There are some more points that may be of interest: 1. Airflow are also in the USA and can be found at www.airflow.com 2. On my 6m 8877 amp I use only a 40BTFL blower which is rated at 48.; /archives//html/Amps/2002-03/msg00100.html (14,211 bytes)
19. [Amps] Glitch resistors (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc (Hons) G8TIC); Date: Wed, 6 Mar 2002 23:04:39 -0000; ? To test a glitch resistor, short the HV+ to gnd. [Before doing this test, install suitable glitch diodes across the meters and across the grid current and anode/plate current shunt resistors] The; /archives//html/Amps/2002-03/msg00120.html (9,206 bytes)
20. [AMPS] Bird Meters (score: 1): Author: mike.tubby@thorcom.co.uk (Michael J. Tubby B.Sc. (Hons) G8TIC); Date: Mon, 11 Feb 2002 17:14:54 -0000; Does "replacements" the I recall seeing these in the Surplus Sales (Nebraska) catalogue - can't put my hands on mine right now. Mike G8TIC -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submission; /archives//html/Amps/2002-02/msg00087.html (7,807 bytes)

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