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221. Re: [Amps] Topband: Elimination of Treadmill RFI on 160 meters (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 28 Jan 2015 17:05:44 +0000; I would replace the bulbs with LEDs. I second that. Being really fed up with replacing little glow bulbs, many of which are no longer available, I replace every one of them by a LED. To replace all t; /archives//html/Amps/2015-01/msg00347.html (10,019 bytes)
222. Re: [Amps] What tube? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 29 Jan 2015 16:58:12 +0000; Well, I got suggestions for three different tubes. All of them being directly heated glass bottles, which makes a lot of sense given my requirements. I don't think I will ever actually build that amp; /archives//html/Amps/2015-01/msg00365.html (14,895 bytes)
223. Re: [Amps] What tube? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 30 Jan 2015 16:19:26 +0000; you can be sure that tube life is adversely affected by frequent on/off cycles of the filament. Well, then it seems to be a bad idea to do so. Which puts tubes some more points behind solid state dev; /archives//html/Amps/2015-01/msg00377.html (17,928 bytes)
224. Re: [Amps] Need Zener for 2KD-3 (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 03 Feb 2015 13:36:23 +0000; Bill, I need a zener for my 2KD-3. It's a 1N4561. It appears that they are really hard to find and exorbitantly expensive when you do. Power zeners are very much out of fashion. They have a tendency; /archives//html/Amps/2015-02/msg00018.html (9,204 bytes)
225. Re: [Amps] Variac Question (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 03 Feb 2015 13:41:44 +0000; Larry, My suggestion is to save that Variac for better uses, and reduce your high voltage by removing a suitable number of turns from the HV transformer's secondary! Depending on the transformer's co; /archives//html/Amps/2015-02/msg00019.html (8,368 bytes)
226. Re: [Amps] Need Zener for 2KD-3 (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 03 Feb 2015 19:11:46 +0000; Al, I think you mean a different circuit than the one I meant. Just FYI, this circuit is called an emitter follower. Back in the early 70's, this was the "regulated" power supply of choice when I wor; /archives//html/Amps/2015-02/msg00031.html (9,656 bytes)
227. Re: [Amps] I'm not kidding: TL922 (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 04 Feb 2015 17:26:42 +0000; Colin, Parasites? Do you mean, in the amp or in the dog? Robert, rent that dog out to Amp Supply, they can use it to prove that their amps are better than Kenwood's! Manfred == Visit my hobby homepag; /archives//html/Amps/2015-02/msg00053.html (7,870 bytes)
228. Re: [Amps] Arctic Silver with and without silver (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 05 Feb 2015 17:38:10 +0000; Mike, the thermal conductivity of such a paste depends more on the granulometry of the solids in it, than on the actual material. Thermal compound is usually a mixture of finely ground thermally cond; /archives//html/Amps/2015-02/msg00068.html (10,486 bytes)
229. Re: [Amps] silver mica source (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 01 Apr 2015 19:37:47 +0000; Alex, I suspect that silver mica caps might not be the best option you have. Silver mica caps consist of mica sheets with an ultra thin layer of silver deposited on each side. This silver layer isn't; /archives//html/Amps/2015-04/msg00014.html (9,141 bytes)
230. Re: [Amps] more - oil bath GS-35b (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 01 Apr 2015 20:49:02 +0000; You have tempted me to jump into the battle, guys, despite the more peaceful part of me saying "don't"! Some facts: - Oil, water, and most other liquid coolants, have very poor thermal conductivity,; /archives//html/Amps/2015-04/msg00018.html (11,862 bytes)
231. Re: [Amps] Strange heat sink on 3kw tube (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 15 Apr 2015 13:46:44 +0000; Bill, Take a look at item at E B #191558050694 Looks like a great way to increase the stray capacitance and make the tube harder to match! ;-) Manfred == Visit my hobby homepage! http://ludens.cl ==; /archives//html/Amps/2015-04/msg00111.html (7,296 bytes)
232. Re: [Amps] Oil v water cooling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 17 Apr 2015 19:27:45 +0000; I worked for 18 years at a scientific organization where we used a variety of liquid-cooled systems. For systems requiring the coolant to be near room temperature, or somewhat cooler, often close to; /archives//html/Amps/2015-04/msg00119.html (9,382 bytes)
233. Re: [Amps] Tetrode calcs (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 27 Apr 2015 19:45:28 +0000; Steve, How do I calculate G2 voltage from the Anode voltage? Basically you decide at what input power level you will run the tube. Along with Anode voltage that gives you the anode current. In a sing; /archives//html/Amps/2015-04/msg00171.html (10,093 bytes)
234. [Amps] Tetrode software (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 30 Apr 2015 16:41:01 +0000; Markku, Scott, etc, could not get the installation script go all the way through on an old laptop with XP. Neither could I, on a pretty up to date PC, although running XP too. The script installed ju; /archives//html/Amps/2015-04/msg00181.html (6,787 bytes)
235. Re: [Amps] Time for New Power Meter (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 03 May 2015 20:50:57 +0000; Don't forget the good old hot wire meters! As long as you have a good, accurate dummy load, that stays good throughout the frequency range of interest, all you need to measure RF power is a hot wire; /archives//html/Amps/2015-05/msg00026.html (9,291 bytes)
236. Re: [Amps] 12V IM3 (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 23 May 2015 16:21:12 +0000; Hi guys, it seems rather funny to me how you worry about rigs having only a -28dB specification for third IMD. Just come here to Chile, and listen in to the kind of signals that populate the 40 and 8; /archives//html/Amps/2015-05/msg00171.html (11,013 bytes)
237. Re: [Amps] 12V IM3 (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 23 May 2015 17:48:28 +0000; Repeatedly some of you have mentioned the supposed advantage of running a device at very much lower output power than its saturation level, to improve linearity. This is true only to a point, not all; /archives//html/Amps/2015-05/msg00172.html (10,429 bytes)
238. Re: [Amps] boost transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 06 Jul 2015 16:07:47 +0000; John, Wayne, and all, The main issue is the excitation current of the transformer. If the transformer was designed (with enough turns and core cross section) for 50 Hz and your running on 60 Hz then; /archives//html/Amps/2015-07/msg00014.html (9,345 bytes)
239. Re: [Amps] SMPS Question (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 22 Jul 2015 16:12:59 +0000; As a "self-appointed specialist" in low noise switching power supplies, I have to chime in... You easily turn them off during RX - not what you would normally do with a Linear HT supply. For QSK? For; /archives//html/Amps/2015-07/msg00095.html (11,232 bytes)
240. Re: [Amps] voltage swing in BJT amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 22 Jul 2015 16:43:08 +0000; Drax, Does it matter how much the voltage swings on the output of a RF power amplifier? It does. It's true that 1 millivolt at 1 milliampere is 1 microwatt, while 1 volt at 1 microampere is also 1 mi; /archives//html/Amps/2015-07/msg00096.html (10,008 bytes)

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