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References: [ +from:manfred@ludens.cl: 419 ]

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361. Re: [Amps] Grid dip meters 2 models, opinions? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 06 Sep 2017 18:30:55 +0000; I have two dipmeters, unfortunately none of the ones in question here, so I can't give any advice. But of the two I have, and which I got as gifts many years ago, from two hams who have since passed; /archives//html/Amps/2017-09/msg00030.html (8,767 bytes)
362. Re: [Amps] Plate coupling capacitor value (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 09 Sep 2017 16:53:24 +0000; Its only 1.275 amps, and that?s peak, not rms. Please be aware that on the highest bands typically much or most of the tuning capacitance is the tube's stray capacitance to ground. For this reason th; /archives//html/Amps/2017-09/msg00053.html (10,330 bytes)
363. Re: [Amps] Plate coupling capacitor value (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 11 Sep 2017 17:50:19 +0000; Bill, Carl, There is a better way to tune 10 and 12 meters despite high tube output and stray capacitance. A small coil in the anode lead will create an "L" network which reduces the plate impedance; /archives//html/Amps/2017-09/msg00056.html (9,931 bytes)
364. Re: [Amps] Amplifier lifetime (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 04 Oct 2017 19:44:43 +0000; _Good_ equipment and machinery should be designed and built well enough to work all the way until becoming obsolete, which is when the owner decides to replace it because new-technology equipment sim; /archives//html/Amps/2017-10/msg00046.html (8,798 bytes)
365. Re: [Amps] Amplifier lifetime (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 05 Oct 2017 14:41:26 +0000; My NCL-2000 is now close to half a century old, and still works perfectly. I got it cheaply, roughly 20 years ago, when it was in bad condition due to dead filter caps, some dead bleeder resistors, a; /archives//html/Amps/2017-10/msg00056.html (8,574 bytes)
366. Re: [Amps] Amplifier lifetime (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 05 Oct 2017 22:00:52 +0000; Hi Jim, and Jim, Interestingly, my NCL-2000 blower is rather quiet and has never posed an irritation. I'd be interested in hearing comments on that issue from other owners. I would specially like to; /archives//html/Amps/2017-10/msg00062.html (13,361 bytes)
367. Re: [Amps] capacitor across mains input to transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 11 Oct 2017 00:12:36 +0000; Steve, Can someone direct me to reading material on this? Plug alert: My web site, of course... The articles on "transformers and coils", and "practical transformer winding": http://ludens.cl/Electro; /archives//html/Amps/2017-10/msg00119.html (9,841 bytes)
368. Re: [Amps] LDMOS amp off battery? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 23 Oct 2017 17:49:02 +0000; Steve, Is anyone running a 50V LDMOS amp off a 48V battery system? I have considered it, but not done yet. I generate my own power, with a turbine in a creek, and in summer I can generate only about; /archives//html/Amps/2017-10/msg00149.html (9,199 bytes)
369. Re: [Amps] LDMOS amp off battery? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 23 Oct 2017 22:49:35 +0000; Steve, When I travel the world on my yacht I shall come and see you! Maybe we could take a trip at sea and work DX and satellites /MM all day? Or maybe we can meet at sea, when I'm sailing on the yac; /archives//html/Amps/2017-10/msg00152.html (11,302 bytes)
370. Re: [Amps] MFJ products (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 05 Dec 2017 17:17:07 +0000; Shon, Jim, and all, with correctly designed switching power supplies there is a MUCH lower risk to get an overvoltage at the output, than with linear supplies. In a linear supply, the most common fai; /archives//html/Amps/2017-12/msg00029.html (9,981 bytes)
371. Re: [Amps] MFJ products (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 06 Dec 2017 20:55:47 +0000; Jim, Don, It seems to me that this is a function of the design and construction of the regulator, including choice of components, not the method of AC/DC conversion. The quality of design and constru; /archives//html/Amps/2017-12/msg00046.html (11,346 bytes)
372. Re: [Amps] Pure signal vs AMPs idle curent (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 08 Dec 2017 16:27:27 +0000; Jim, For those of you folks that have pre-distortion capabilities, like the ANAN xcvrs... and use an external tube linear amp. Has anyone tried measuring the IMD results with pure signal turned on...; /archives//html/Amps/2017-12/msg00065.html (12,902 bytes)
373. Re: [Amps] Negative feedback passive input tetrode (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 15 Dec 2017 14:11:23 +0000; Bill, Has anyone see or used negative feedback to better obtain lower IMD in a passive (resistor terminated) input tetrode amplifier? Any thoughts or references or experience? I can offer only some t; /archives//html/Amps/2017-12/msg00112.html (13,551 bytes)
374. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 23 Dec 2017 20:18:10 +0000; Mark, I can't resist the evil temptation of advertising more modern technology! Regarding the problem you see in 1500W amps using 65V LDMOSFETs: Biggest issue I see for home builder is getting a 65V; /archives//html/Amps/2017-12/msg00131.html (8,291 bytes)
375. Re: [Amps] Defining CCS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 01 Jan 2018 13:58:35 +0000; I wonder why we are even discussing all this CCS versus ICAS stuff here. We are radio amateurs, right? Not broadcasters. I fail to see what's the sense of having a CCS amplifier for our ham use! Let'; /archives//html/Amps/2018-01/msg00000.html (10,382 bytes)
376. [Amps] Low pass filters and saturated operation (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 01 Jan 2018 14:39:25 +0000; Hi all, after my rather pointless post moments ago about the ICAS-CCS debate, here is a somewhat more meaty year-starter for those of you who do enjoy hands-on amplifier building. I'm currently devel; /archives//html/Amps/2018-01/msg00001.html (10,673 bytes)
377. Re: [Amps] Low pass filters and saturated operation (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 02 Jan 2018 00:49:33 +0000; Steve, coughdiplexer No go! While it's true that a diplexer would nicely terminate all harmonics and thus avoid impedance transformation in the line, it would also negate the main advantage of an ET; /archives//html/Amps/2018-01/msg00009.html (8,165 bytes)
378. Re: [Amps] Plate Choke Issue (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 03 Jan 2018 19:01:44 +0000; Hi AJ, What am I missing? Let's try. RF heating? I just did the maths. With ~30焙 and no stray effects you should be getting a bit more than 1A of RF current in that choke. The RF resistance of the w; /archives//html/Amps/2018-01/msg00031.html (10,679 bytes)
379. Re: [Amps] Toroidal filament choke and DC current (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 04 Jan 2018 14:49:09 +0000; Pete, I've seen some concerns about core saturation due to the DC cathode current involved in this application. I just did the maths. Unless I messed up while typing numbers into my trusty old Sharp; /archives//html/Amps/2018-01/msg00040.html (9,462 bytes)
380. Re: [Amps] 400 watt Polyfet HF amplifier (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 19 Jan 2018 18:04:45 +0000; Hi John, Please allow me to throw a bucket (or at least a few cups) of cold water on that design: - According to the gain curves shown, that amplifier is pretty linear up to a PEP of roughly 300W at; /archives//html/Amps/2018-01/msg00091.html (11,127 bytes)

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