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1. [AMPS] Alpha 77 (score: 1): Author: Chris" <chris@g3vbl.co.uk (Chris); Date: Tue, 18 Dec 2001 22:33:13 +0000; Hi, A US friend, not subscribed to this reflector, is interested to know what is the current value of an Alpha77. That is a plain vanilla Alpha77 (Model # PS70-7) Serial #25xx. Is anyone able to help; /archives//html/Amps/2001-12/msg00332.html (6,597 bytes)
2. Re: Re: [Amps] anyone else been contacted? (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Fri, 29 Aug 2003 13:27:55 +0000; At 14:04 28/08/2003 -0400, Jeff wrote: I recently purchased a pro audio amp (2200 watts ave.) from a seller that didn't know me from Adam. I asked where to send the check, and he replied, "Here is ho; /archives//html/Amps/2003-08/msg00074.html (9,780 bytes)
3. Re: [Amps] About single 4CX250b output power (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Mon, 27 Oct 2003 14:09:17 +0000; At 09:10 27/10/2003 +0100, OZ1PIF wrote: You could almost make with an 4cx350, Give it some 2800V, and it'll still live for a long time, and a relatively clean 325-340W. a 4cx250? no way, it'll max o; /archives//html/Amps/2003-10/msg00249.html (8,224 bytes)
4. Re: [Amps] drake l-4b from 4-400 to 3-500 (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Tue, 24 Aug 2004 13:12:39 +0000; At 12:49 24/08/2004, Chuck wrote: whats the scoop with converting the bottles in a drake l-4b from 4-400 to 3-500??? Do you mean from 3-500 to 4-400, because the L4B came with 3-500s? Chris _________; /archives//html/Amps/2004-08/msg00277.html (6,934 bytes)
5. Re: [Amps] Looking for a design for a single 4cx250b tube on50 Mhz-six meters. (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Tue, 12 Oct 2004 20:14:11 +0000; At 18:51 12/10/2004, you wrote: The manual claims that a single 4CX250B will produce 600 watts peak output. It has unregulated bias supplies as well. I wonder if that is figuring peak voltage squared; /archives//html/Amps/2004-10/msg00185.html (8,475 bytes)
6. [Amps] Harris RF-125 Noise Reduction Unit (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Wed, 09 Mar 2005 16:43:02 +0000; Hi, A friend of mine in SE Asia, who in spite of being an engineer dislikes the internet, is bringing back to life a Harris RF-110A amplifier. One day, while on the phone with him, I commented that t; /archives//html/Amps/2005-03/msg00237.html (7,048 bytes)
7. Re: [Amps] a common topic here tspa (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Fri, 08 Apr 2005 11:48:11 +0100; Newton, were he still alive, might be 'surprised' by this 'explanation'. Chris _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma; /archives//html/Amps/2005-04/msg00167.html (9,396 bytes)
8. [Amps] Harris RF-110A connector (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Fri, 29 Jul 2005 12:39:35 +0000; Hi, A friend in SE Asia has, once again, asked me for help with his RF-110A amplifier. Although he knows his way around pretty well, he has been unable to source a connector which is, I believe, part; /archives//html/Amps/2005-07/msg00355.html (6,770 bytes)
9. Re: [Amps] 3-500 / 4-400 cooling. (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sun, 09 Oct 2005 15:13:34 +0000; Perhaps that's because air system sockets were designed to be used with centrifugal blowers? But the fact remains that both the SB220 and TL-922 suffer failures due to inadequate cooling of the filam; /archives//html/Amps/2005-10/msg00204.html (7,997 bytes)
10. Re: [Amps] 813's (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sat, 27 May 2006 20:32:15 +0000; The ARRL publication "Single Sideband for the Radio Amateur" Fifth Edition 1970 also has these amps on pp138-141. Chris G3VBL _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2006-05/msg00432.html (8,639 bytes)
11. Re: [Amps] 4-1000 amp (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Mon, 29 May 2006 09:51:36 +0000; I cannot help but wonder why you keep pedalling this one. I have been, yet again, to the Eimac/CPI data sheets which read as follows: grounded grid capacitance in pf in out feedback 3CX1200A7 20 10.3; /archives//html/Amps/2006-05/msg00472.html (8,166 bytes)
12. Re: [Amps] 3cx3000A7 driver (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sun, 23 Jul 2006 20:12:17 +0000; A similar transceiver was made in the UK by Light Electro Developments. As I recall the Anglian 650 had a pair of TT21s in the final and the Anglian 1000 ran a pair of 4X250s. Two vfos and used a mod; /archives//html/Amps/2006-07/msg00971.html (9,119 bytes)
13. Re: [Amps] 230 v wiring (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Wed, 25 Apr 2007 21:50:02 +0000; Perhaps a 'Nordust Vishnu Mains lead' would help. http://www.hifi-plus.co.uk/mains.html (for dollar prices, just double) I have spent some months trying to persuade the technology editor of the Sunda; /archives//html/Amps/2007-04/msg00298.html (7,045 bytes)
14. Re: [Amps] LK 500 ZA heat (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Mon, 13 Aug 2007 20:44:21 +0000; This should read .... it's a lot more profitable when dealing with folks who are more gullible than hams. A fool hi-fi buff and his money are soon parted. Chris G3VBL ________________________________; /archives//html/Amps/2007-08/msg00065.html (8,640 bytes)
15. Re: [Amps] Shipping Alpha 91b from US to Eu (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sun, 02 Sep 2007 18:42:44 +0000; I've just checked an invoice and see that shipping two amplifier packages, each weighing 80lb, from the mid-West to UK cost $148 back in 1990. This was using Nippon Express. A few years later Henry q; /archives//html/Amps/2007-09/msg00016.html (8,289 bytes)
16. Re: [Amps] IMD (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Wed, 26 Sep 2007 08:15:51 +0000; All this talk of SB200s caused me to run a Google search. there was loads of interesting information out there but I also came across the following: FOR SALE: HEATHKIT SB-200 AMPLIFIER CONVERTED SOLE; /archives//html/Amps/2007-09/msg00317.html (8,551 bytes)
17. Re: [Amps] IMD (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Wed, 26 Sep 2007 14:01:52 +0000; Forgive me, but I don't understand where your figure of 'a third' comes from. Is it something that "makes sense to you" and is this how you decided it was "right" for you? Chris _____________________; /archives//html/Amps/2007-09/msg00328.html (7,725 bytes)
18. [Amps] Homebrew amplifier tube (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Wed, 09 Jan 2008 09:46:33 +0000; Back to basics <http://www.dailymotion.com:80/video/x3wrzo_fabrication-dune-lampe-triode_tech>http://www.dailymotion.com:80/video/x3wrzo_fabrication-dune-lampe-triode_tech Perhaps he could do the sam; /archives//html/Amps/2008-01/msg00082.html (6,517 bytes)
19. Re: [Amps] 3-500Z (score: 1): Author: "Chris Pedder" <chris@g3vbl.co.uk>; Date: Sun, 30 Nov 2008 08:27:36 +0700; I would advise extreme caution in dealing with this person. If you require further details, please contact me. Chris G3VBL/8P9EM _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2008-11/msg00247.html (6,617 bytes)
20. Re: [Amps] filament transformers (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sat, 16 May 2009 13:34:36 +0000; Hi, I'm sure we all have different 'first' memories, but mine happen to be sitting at a table placing 'T' and 'U' shaped laminations into bobbins that my father had wound on a winding machine he had; /archives//html/Amps/2009-05/msg00084.html (8,648 bytes)

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