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1. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Thu, 21 Dec 2006 01:58:58 +0000; I really hope it's not too improper to take this thread for my first post to this group: If you mean the very usual bugs in the schematics, and omission of important information, that's mostly a prob; /archives//html/Amps/2006-12/msg00183.html (11,004 bytes)
2. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 22 Dec 2006 14:57:31 -0300; Hi all! Thanks for all the answers. I will reply one by one: Bill: Now I see what you mean. Sorry for the mixup! Yes, indeed I have not seen any amplifier using such a half have voltage doubler. It w; /archives//html/Amps/2006-12/msg00201.html (16,023 bytes)
3. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sun, 24 Dec 2006 19:20:38 -0300; Hi Marv, That's a possibility, but the advantage in efficiency is not nearly as great as running an envelope-restored class E or even class C circuit. I have not seen them. So far I have seen heat pi; /archives//html/Amps/2006-12/msg00210.html (11,036 bytes)
4. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 25 Dec 2006 18:33:40 -0300; Hi Mike, I would be interested in where I can buy such a cold plate! I googled for them, and found hundreds of models for CPUs and video chips, but nothing large enough for the power level I need, mu; /archives//html/Amps/2006-12/msg00214.html (12,000 bytes)
5. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 26 Dec 2006 19:00:40 -0300; Hi Mike! Now they have no schematic, or at least I couldn't find it. I hope I can free some time for this project, but for now I'm only trying to pull together the facts, to analyze whether it makes; /archives//html/Amps/2006-12/msg00217.html (16,847 bytes)
6. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 01 Jan 2007 21:19:16 +0000; Hi Mike, and all! I also have a big heat sink, courtesy of XQ2PSP. I intend to first see how much heat my amp finally produces. Maybe, JUST maybe, I can do with a big, fanless heat sink. That would b; /archives//html/Amps/2007-01/msg00012.html (9,388 bytes)
7. Re: [Amps] QST, and class AB/F MOSFET amps (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 06 Jan 2007 17:04:03 -0300; Hi Danny! OK, so here it goes! I built the complete scale model (for 15 Watts output), including the modulator. I finished this just a few hours before I had to leave home for a trip, so I didn't hav; /archives//html/Amps/2007-01/msg00070.html (9,716 bytes)
8. Re: [Amps] power supply transformer (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 02 Feb 2007 11:39:37 -0300; Hi all! With so much discussion going on, I will add my half cent worth on two issues. First: Exactly. It can be perfectly safe to run an amplifier or other device directly from the line, without any; /archives//html/Amps/2007-02/msg00007.html (10,627 bytes)
9. Re: [Amps] power supply transformer (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 05 Feb 2007 10:11:31 -0300; Hi Paul, Peter C., Peter V., Tom, and all! As usual, I come late, but I will still add my comments to this thread. Google for the "all-american five" design for tube type radios, which was used in co; /archives//html/Amps/2007-02/msg00049.html (20,487 bytes)
10. [Amps] No class F amplifier for now... (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 10 Feb 2007 20:20:46 +0000; Several people on this forum have asked me to keep them current on my solid state class F amplifier project with envelope restoration. Unfortunately I have bad news. After building a scale model of i; /archives//html/Amps/2007-02/msg00175.html (8,262 bytes)
11. Re: [Amps] Power Transistor Question -- 2SC5125 (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 19 Feb 2007 10:17:59 -0300; Hi Steve! Good question. Many people ask themselves the same thing. I will try to explain: The RF power output rating of a transistor is a flexible thing. It depends very much on the class of operati; /archives//html/Amps/2007-02/msg00293.html (14,151 bytes)
12. [Amps] Getting rid of blower noise (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 19 Feb 2007 15:04:51 -0300; Hi all, this time I have questions, rather than answers. My present amplifier is an ages-old National Radio NCL-2000. I refurbished it when I obtained it very cheaply a few years ago. Picking up anot; /archives//html/Amps/2007-02/msg00300.html (8,796 bytes)
13. Re: [Amps] Power Transistor Question -- 2SC5125 (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 20 Feb 2007 10:50:10 -0300; Hi Peter, Bob, and all, Sure that's part of the reason, but indeed tubes are quite reliable. One of my hobbies is restoring antique radios. When I get a 70 year old, nonfunctional radio, most typical; /archives//html/Amps/2007-02/msg00310.html (11,415 bytes)
14. Re: [Amps] Getting rid of blower noise (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Tue, 20 Feb 2007 11:43:32 -0300; Hi Paul, Gary, Marv, Robin, Kim, and all, For a long time I have wanted to do that. But it would mean removing the blower and installing it outside the cabinet, because in this amplifier the blower i; /archives//html/Amps/2007-02/msg00311.html (15,416 bytes)
15. Re: [Amps] Plate Load Calc. (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 03 Mar 2007 16:30:02 -0300; Hi Steve, I prefer not using any such "fudge factors", but instead calculate the real situation, based on the actual tube and operating condition. I will explain this with an example: Let's assume th; /archives//html/Amps/2007-03/msg00024.html (9,677 bytes)
16. Re: [Amps] Berkshire (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 03 Mar 2007 16:56:06 -0300; Hi Bob, I will give you one reason, which was quite important for me, when I built amplifiers: I wound my own power transformers, because I could get the iron for free and the wire quite cheaply. Buy; /archives//html/Amps/2007-03/msg00026.html (9,161 bytes)
17. Re: [Amps] Plate Load Calc. (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Wed, 07 Mar 2007 10:56:08 -0300; Hi Steve, I share your wondering! Actually, in some newer books they are not used. It seems that some author in the dark ages of electronics came up experimentally with these fudge factors, without u; /archives//html/Amps/2007-03/msg00135.html (14,928 bytes)
18. Re: [Amps] NCL2000 and WARC bands (Claude Frantz) (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 09 Mar 2007 01:53:32 +0000; Hi Claude, Mine does it quite well! My quick adjust notes tell: For 17m, put bandswitch to 15m, TUNE at 60 and LOAD at 40. For 12m, bandswitch at 10m, TUNE at 36 and LOAD at 41. This is for resistive; /archives//html/Amps/2007-03/msg00147.html (6,866 bytes)
19. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 13 Apr 2007 15:30:57 -0400; Hi ye all, I feel you are worrying too much about Q and the like. Make it simple, guys! Start from the basics: You know the operating frequency, and the total tuning capacitance value. Take the maxim; /archives//html/Amps/2007-04/msg00109.html (9,253 bytes)
20. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 13 Apr 2007 19:00:02 -0400; Hi Gary, Yes, and actually this current (to the coil) is much larger than the current coming through the the tube! But this doesn't affect the calculation at all, since the tube plate, tuning cap top; /archives//html/Amps/2007-04/msg00113.html (10,290 bytes)

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