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21. Re: [Amps] antek web site (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Mon, 3 May 2010 21:06:51 +0200; FYI, Via their website I recently bought one transformer for grid supply purposes: promptly delivered and according to spec, highly recommended ! Gl, Carel. I've had there site on my radar for while.; /archives//html/Amps/2010-05/msg00036.html (9,889 bytes)
22. [Amps] wirewound resistor inductance/capacitance parameters (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Sat, 16 Apr 2011 17:37:29 +0200; Hi, Was wondering if someone had some RF data (inductance/capacitance, or even better a spice model..) of the general available low cost aluminum housed high power (e.g. 50W) resistors for chassis mo; /archives//html/Amps/2011-04/msg00459.html (7,642 bytes)
23. Re: [Amps] wirewound resistor inductance/capacitance parameters (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Mon, 18 Apr 2011 11:15:42 +0200; Jim, thanks for your reply, however my goal is to see what can be done with those low cost chassis mount resistors. The non-inductive one's (or special thickfilm resistor) are much more expensive....; /archives//html/Amps/2011-04/msg00471.html (10,271 bytes)
24. Re: [Amps] Should a blower run after amp shutdown? (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Fri, 3 Jun 2011 20:13:42 +0200; Hi, Maybe of interest, I just uploaded some info on the circuit I use for ramping up the filament voltage under SCR/Triac control (http://www.pc5m.net/projects/filament-inrush-protection) Works very; /archives//html/Amps/2011-06/msg00030.html (10,265 bytes)
25. [Amps] PA choke design (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Tue, 28 Jun 2011 17:26:30 +0200; Hi, I know it has been discussed before, but can't find any good pointers. For my single band 160mtrs PA I would like to design the plate choke inductor. I would like to get the group opinion on - us; /archives//html/Amps/2011-06/msg00304.html (7,711 bytes)
26. [Amps] running two 3 phase transformer serie/parallel (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Tue, 25 Oct 2011 16:10:11 +0200; Hi, I have two identical 3 phase high voltage transformer (each around 4KVA / 50 kg/ 100 pounds). Issue is they are designed for US 3 phase voltages. (so 120 / 204V) so can't use them in Europe as is; /archives//html/Amps/2011-10/msg00071.html (7,400 bytes)
27. Re: [Amps] running two 3 phase transformer serie/parallel (score: 1): Author: "pc5m, Carel" <pc5m@xs4all.nl>; Date: Wed, 26 Oct 2011 11:40:48 +0200; Hi Gerald, We have here 400V 3 phase power (voltage between the phase's) and as a result 230V between a phase and ground. So the lowest voltage I have "available" is 230Vac... gl, Carel. your primary; /archives//html/Amps/2011-10/msg00074.html (9,446 bytes)
28. Re: [Amps] running two 3 phase transformer serie/parallel (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Thu, 27 Oct 2011 19:05:22 +0200; Bill, Dave, Mike, Gerald Thanks all for the good advices !. Looks like it all "depends" and some hands on experiment is mandatory :-). It seems I don't need to scrap the transformers yet... Think I w; /archives//html/Amps/2011-10/msg00078.html (9,045 bytes)
29. Re: [Amps] Warm up and on time question... (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Fri, 16 Dec 2011 21:49:40 +0100; Hi Mike, Have a look at: http://www.pc5m.net/projects/filament-inrush-protection Is in use for my TH289 (45amps of filament current) amplifier. Gl, Carel Speaking of warm up times and filament life g; /archives//html/Amps/2011-12/msg00124.html (9,634 bytes)
30. Re: [Amps] Safety choke question (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Tue, 10 Jan 2012 19:13:20 +0100; Hi Jim, I suppose you would like to put that choke across the (50Ohm) output terminal ? Think 225uH is not needed at all to have negligible effect at 160mtrs. I would go for a reasonable sized toroid; /archives//html/Amps/2012-01/msg00117.html (8,857 bytes)
31. Re: [Amps] tetrode reverse screen grid current (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Sun, 29 Jan 2012 22:20:33 +0100; Hi, I am using some sort of shunt/linear circuit for grid supply (negative) in my tetrode amplifier. For the sake of this discussion I just adapted the schematic (reversed diodes and replaced pnp for; /archives//html/Amps/2012-01/msg00273.html (10,022 bytes)
32. [Amps] RF tube performance simulator (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Tue, 22 May 2012 14:34:49 +0200; Hi, inspired by the Eimac "Tube Performance computer for RF Amplifiers" and to get a flexible tool to get faster insight in RF power amplifier design I have made a small (Windows) application: RF Tub; /archives//html/Amps/2012-05/msg00313.html (7,500 bytes)
33. Re: [Amps] Dummy Load Blues (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Tue, 26 Jun 2012 22:19:47 +0200; Hi, I couldn't resist and put another design implementation of this scenario online: http://www.pc5m.net/projects/dummyload-watercooled Watercooled, 4 kW continues, max. Freq 30 MHz, quite simple, sm; /archives//html/Amps/2012-06/msg00407.html (13,609 bytes)
34. Re: [Amps] Pulser (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Wed, 12 Sep 2012 21:08:07 +0200; Hi, some months ago I made this "pulser controller", reason: at that time my dummyload wouldn't handle the continues power... also interesting to see real single pulse power of your amp. Maybe a bit; /archives//html/Amps/2012-09/msg00238.html (8,203 bytes)
35. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Thu, 27 Sep 2012 21:07:01 +0200; Jim, I made (and used for my current 160mtrs tetrode th289 amp) almost the same for grid supply. But will work also good for positive screen supply (use NPN and reverse diodes). http://www.pc5m.net/p; /archives//html/Amps/2012-09/msg00310.html (14,550 bytes)
36. [Amps] low Q output matching (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Sat, 10 Nov 2012 16:26:38 +0100; Hi, I was wondering what else, besides bad harmonic suppression, will happen when I design my (single band) output matching network (PI-L) with low Q (lowest Q needed to get the match done) ? When us; /archives//html/Amps/2012-11/msg00080.html (7,195 bytes)
37. Re: [Amps] low Q output matching (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Sun, 11 Nov 2012 15:56:38 +0100; Hi Peter (and Gerald) Basically my aim is to get the simplest output match circuit possible (simplest = lowest value of C's, because high valued, high current, high voltage variable C's are difficult; /archives//html/Amps/2012-11/msg00084.html (9,890 bytes)
38. Re: [Amps] low Q output matching (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Tue, 13 Nov 2012 22:38:55 +0100; Thanks to all who responded to my initial question, very interesting to read the comments !. Much appreciated. Seems (as most of the time..) there isn't a free lunch served...Will just continue with; /archives//html/Amps/2012-11/msg00094.html (11,074 bytes)
39. Re: [Amps] GS-35B Pi Tank design (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Thu, 9 May 2013 16:12:10 +0200; Hi, if you would like to get even more insight in load lines, peak and average currents, etc, have a look at an application (RfTubeModeller) I made ( http://www.pc5m.net/projects/rftubemodel ). Based; /archives//html/Amps/2013-05/msg00135.html (10,306 bytes)
40. [Amps] 3cx800 flashover ? (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Wed, 21 Aug 2013 18:03:16 +0200; Hi, I need some advice of the group if this 3cx800 is beyond revitalization. Working on an old SSB electronics 70cm PA with a single 3cx800 in grounded grid configuration. Original bias/control circu; /archives//html/Amps/2013-08/msg00116.html (7,650 bytes)

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