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21. Re: [Amps] low Q output matching (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Mon, 12 Nov 2012 16:09:49 +0100; Carel, When the amplifier is running in any class other than A, (except in one case which I'll deal with later), the tank circuit 'rings' with each current pulse, and 'fills in' the voltage swing at; /archives//html/Amps/2012-11/msg00087.html (11,675 bytes)
22. Re: [Amps] low Q output matching (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Tue, 13 Nov 2012 16:46:20 +0100; tube doesn't conduct, that's the exact same thing as suppressing the harmonics. Any low pass filter that achieves good harmonic suppression will nicely restore the sine waveshape< True, but one cann; /archives//html/Amps/2012-11/msg00090.html (8,690 bytes)
23. Re: [Amps] Resonant choke measurment (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 23 Dec 2012 13:05:09 +0100; Another method is to make a Hay's Bridge. Then you can apply AC via a transformer winding in series with the DC supply used to set the current through the choke. If the choke is around 20 ohms DC and; /archives//html/Amps/2012-12/msg00150.html (8,027 bytes)
24. Re: [Amps] PA tube testing (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 23 Dec 2012 13:07:12 +0100; Not surprised the 6146 isn't listed. That copy of Ham News is dated 1951, and the 6146 didn't appear until 1953 . 73 es Season's greetings Peter G3RZP REPLY: That list of tubes brought back some memo; /archives//html/Amps/2012-12/msg00151.html (8,389 bytes)
25. Re: [Amps] Resonant choke measurment (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Tue, 25 Dec 2012 11:21:06 +0100; Bob, The Hay's bridge doesn't need an inductor at all - just a transformer (a filament transformer will do) in series with the DC supply to provide the AC bridge signal. Plus, you don't need a storag; /archives//html/Amps/2012-12/msg00173.html (14,296 bytes)
26. Re: [Amps] Resonant chokes (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Tue, 25 Dec 2012 11:26:29 +0100; Carl asked "How did Henry and others long before them do it before all that fancy stuff became available?" General Radio (from your part of the world, Carl) did an inductance bridge where you could s; /archives//html/Amps/2012-12/msg00175.html (7,586 bytes)
27. Re: [Amps] Most power ever run on amateur radio :-) (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 26 Dec 2012 22:14:20 +0100; Once you get over a few kW, things like feeders and antennas can get to be a problem. Plus you have to very well off to afford the electricity bill! G3SJX once somewhat tongue in cheek suggested the; /archives//html/Amps/2012-12/msg00182.html (8,882 bytes)
28. Re: [Amps] Choke input filters, design criteria? (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 26 Dec 2012 22:20:24 +0100; Boye has a very good point. Plus, for commercially available amplifiers in Europe, IF they are to legally carry the CE mark, there are limits on power factor and peak current. Enforcement is so poor; /archives//html/Amps/2012-12/msg00184.html (8,701 bytes)
29. Re: [Amps] Peter Dahl transformers (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 20 Feb 2013 12:29:41 +0100; The downside to the switcher must be reliability. There are far more parts, so the MTBF must be less. Whether or not this a is a major concern is up to the individual. Peter G3RZP ___________________; /archives//html/Amps/2013-02/msg00164.html (8,489 bytes)
30. Re: [Amps] 813 efficiency (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Fri, 22 Feb 2013 17:01:58 +0100; Another way is to abandon the pi network and run them in push-pull: this was how quite high efficiencies were obtained on the higher bands 'in the good old days' admittedly, in Class C. That wouldn't; /archives//html/Amps/2013-02/msg00191.html (8,217 bytes)
31. Re: [Amps] 813 efficiency (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 23 Feb 2013 14:35:11 +0100; Carl, You can switch tank coils in push pull amps! I wonder how many people got killed bandchanging a BC610? 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2013-02/msg00205.html (7,991 bytes)
32. Re: [Amps] 813 efficiency (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Tue, 26 Feb 2013 20:55:37 +0100; Carl, them over decades indicates an ICAS Pd of 200-250W is more realistic and use a little air on the glass. I show just a little color on SSB voice peaks at 1200W for 4 tubes. On CW in a contest en; /archives//html/Amps/2013-02/msg00245.html (8,292 bytes)
33. Re: [Amps] 813 efficiency (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Wed, 27 Feb 2013 19:58:22 +0100; I suppose that 32 years in the semiconductor industry has made me somewhat cynical, but I just can't see me being a sand hugger for RF power - not at my age. Peter G3RZP _____________________________; /archives//html/Amps/2013-02/msg00249.html (8,099 bytes)
34. Re: [Amps] 813 efficiency (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Fri, 01 Mar 2013 21:42:12 +0100; Graphs of efficency v. output power with frequency as a parameter. Graphs of IMD v output power with frequency as a parameter. Graphs of harmonic level v. output power with frequency as a parameter.; /archives//html/Amps/2013-03/msg00021.html (7,699 bytes)
35. [Amps] FW: Re: Heatsinks for SSPAs - Newbie Questions and UK source (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Fri, 01 Mar 2013 23:38:03 +0100; Heat only rises in air, where it heats the air and makes that rise. Just thinking about heatsinks for homebrew SS rigs. Here's an idea, maybe a bit in-elegant but I bet it would work like a champ. Us; /archives//html/Amps/2013-03/msg00025.html (8,059 bytes)
36. Re: [Amps] Expert 1k amp (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Thu, 07 Mar 2013 11:05:52 +0100; Steve, How much filtering is there to meet EU regs on noise put on the mains, and is there any power factor correction circuitry? 73 Peter G3RZP Yesterday I did some minor repairs to a friend's amp -; /archives//html/Amps/2013-03/msg00074.html (8,203 bytes)
37. Re: [Amps] Power factor correction on tube amps - EU regs (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Thu, 07 Mar 2013 19:05:26 +0100; Hi John, I have been told that the power factor business applies to linear power supplies drawing more than 10Amps. Now I can't justify buying all the relevant CENELEC specs, so it's only hearsay evi; /archives//html/Amps/2013-03/msg00081.html (9,763 bytes)
38. [Amps] Expert 2K FA amplifier (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 09 Mar 2013 11:47:02 +0100; Bob asked me to upload this link, as he cannot for some reason http://g4ujs.shacknet.nu/spe_2k-fa.pdf 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2013-03/msg00107.html (6,507 bytes)
39. Re: [Amps] FW: Power factor correction on tube amps (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 09 Mar 2013 12:02:44 +0100; good chance that they are compliant with EU regulations. Or maybe not. :)< The link posted to the site of Bob, G4UJS (http://g4ujs.shacknet.nu/spe_2k-fa.pdf) suggests that they should be, as they cla; /archives//html/Amps/2013-03/msg00108.html (8,262 bytes)
40. Re: [Amps] FW: Power factor correction on tube amps (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 09 Mar 2013 23:05:38 +0100; Strictly, ISO 9000 registartion means that you have the paperwork and the parts should meet the spec. Once you put self -certification to a published Harmonised Standard in the loop, it should, in th; /archives//html/Amps/2013-03/msg00117.html (7,586 bytes)

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