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61. Re: [Amps] Filament Xfmr (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 08 Jul 2012 19:27:41 +0000; Pete, For the primary that wire size is plenty, but for the secondary it's rather cheap. It won't change between one hour, and continuous use. The thermal mass of single thin wires in air is low enou; /archives//html/Amps/2012-07/msg00128.html (10,026 bytes)
62. Re: [Amps] Silicone hose from Flex Technologies (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 21 Jul 2012 19:17:54 +0000; When you need custom silicone parts, such as tube chimneys, they can often be made completely from RTV sealant. Just find or make a suitable form, smear sealant into it, let it set, then remove the f; /archives//html/Amps/2012-07/msg00237.html (8,486 bytes)
63. Re: [Amps] Silicone hose from Flex Technologies (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 26 Jul 2012 17:10:42 +0000; Jim, Not really! A chimney for a 4CX1500B, for example, would be about 8.2cm inner diameter, and at most 10cm tall. Making it a half centimeter thick, which is rather generous, you need 273ml of sili; /archives//html/Amps/2012-07/msg00272.html (10,737 bytes)
64. Re: [Amps] IMD test question (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 01 Aug 2012 22:17:22 +0000; Adding to the IMD testing thread: When generating a dual tone signal in the computer, outputting it to one radio to generate the drive signal, and then using the same computer to do spectrum analisis; /archives//html/Amps/2012-08/msg00025.html (10,126 bytes)
65. Re: [Amps] 4CX1500B project (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 09 Aug 2012 15:55:21 +0000; Vic, Bill, and all, Instead of a simple plain parallel resonant circuit, which would need to be bandswitched, a simpler solution is to include a basic low pass filter section in PI configuration, tha; /archives//html/Amps/2012-08/msg00150.html (8,944 bytes)
66. Re: [Amps] Blue Disc Ceramic caps ?? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 17 Aug 2012 23:12:27 +0000; Hank, I have seen many blue disk ceramic caps used in high voltage applications, but not where very high current is involved. For example they are common in AC line filters, and many of these blue ca; /archives//html/Amps/2012-08/msg00290.html (10,421 bytes)
67. Re: [Amps] Can some explain this curious eBay auction (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 26 Aug 2012 00:21:13 +0000; I did, two days ago... I have loads of Sylvania 6A6 NOS, but alas, they seem to sell for just 12 bucks apiece... I will have to wait until somebody discovers and adequately publicizes their magical; /archives//html/Amps/2012-08/msg00424.html (9,340 bytes)
68. Re: [Amps] Transformer guess? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 26 Aug 2012 23:21:29 +0000; Vic, A simple rule for small transformers is that they are designed to have a voltage drop of close to 5% in each winding (10% total). This figure can vary a little, but not very much. At least it gi; /archives//html/Amps/2012-08/msg00455.html (7,792 bytes)
69. [Amps] 4-5000 and others (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 28 Aug 2012 19:04:03 +0000; As usual, I come a bit late with my comment: I have no idea whether a 4-5000 existed, but I know for certain that big air-cooled tubes did exist. The Radio Club Concepcion, here in Chile, where I did; /archives//html/Amps/2012-08/msg00508.html (7,983 bytes)
70. Re: [Amps] current threads about silver solder and resoldering (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 28 Aug 2012 21:56:38 +0000; When I repair old equipment, indeed I often find myself removing old solder from a joint as completely as I can, and soldering it with new solder. I can come with several plausible reasons why the ol; /archives//html/Amps/2012-08/msg00514.html (10,861 bytes)
71. Re: [Amps] 4-5000 and others (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 29 Aug 2012 18:43:07 +0000; Hello, I was just looking on the web for the large air cooled tube I remember, and I found a photo of a Western Electric tube that looks quite a lot like the one I have in mind, although the size isn; /archives//html/Amps/2012-08/msg00528.html (8,656 bytes)
72. Re: [Amps] current threads about silver solder and resoldering (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 31 Aug 2012 19:19:48 +0000; Gene, Unfortunately, I have occasionally seen "60/40" solder for sale that, upon reading the SMALLER print, is 60Pb/40Sn. I have never seen that. But of course, it might happen... We should be aware; /archives//html/Amps/2012-08/msg00533.html (9,468 bytes)
73. Re: [Amps] current threads about silver solder and resoldering (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 01 Sep 2012 18:26:17 +0000; Bill, Most things are labeled the largest component to the smallest by weight, Yes, for example the list of chemicals in food is like that. But solder normally isn't. I think there is an ISO standard; /archives//html/Amps/2012-09/msg00000.html (7,391 bytes)
74. Re: [Amps] current threads about silver solder and resoldering (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 02 Sep 2012 02:41:49 +0000; Roger, are you kidding us, or are you applying reversed logic today? ;-) Lead = 207.2 Tin 118.7 Yes, that's right. That's the weight of these elements, expressed in grams per mole of atoms. One mole; /archives//html/Amps/2012-09/msg00015.html (9,215 bytes)
75. Re: [Amps] current threads about silver solder and resoldering (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 02 Sep 2012 16:15:31 +0000; Bill, I recalled that the ratios of lead and tin atoms had to be an integer to for the lowest melting point. But that's not right either! I hate to be so overly teacherish in this thread, but facts r; /archives//html/Amps/2012-09/msg00019.html (9,786 bytes)
76. Re: [Amps] Zener Screen Regulators (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 05 Aug 2012 14:43:10 +0000; In this particular matter about the true direction of current flow, I agree with Bill, for a change... While it is understandable that back in the dark ages it was defined the wrong way, because peop; /archives//html/Amps/2012-09/msg00053.html (9,965 bytes)
77. Re: [Amps] Zener Screen Regulators (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 05 Aug 2012 18:23:10 +0000; Bill, In this particular matter about the true direction of current flow, I agree with Bill, for a change... REPLY: Thanks Manfred but I'm trying to recall when we ever disagreed on anything... Well,; /archives//html/Amps/2012-09/msg00061.html (8,614 bytes)
78. Re: [Amps] Zener Screen Regulators (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 08 Sep 2012 02:50:45 +0000; If a negative charge flows left, then a positive charge appears to flow right. Yes, only the electron "physically" moves. That's halfways right, but I still just don't see the need of even talking ab; /archives//html/Amps/2012-09/msg00124.html (10,220 bytes)
79. Re: [Amps] Zener Screen Regulators (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 08 Sep 2012 18:28:10 +0000; Hi Jim, Two minor points. The "flow" of current is a useful concept when visualizing circuits, but in AC circuits there actually is no flow of current along a wire. There is! The conduction electrons; /archives//html/Amps/2012-09/msg00129.html (11,353 bytes)
80. Re: [Amps] SS Amp questions (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 09 Sep 2012 17:07:09 +0000; Tom, Unfortunately, multiple design, manufacturing, and quality issues have repeatedly put the product on the shelf for 6 other contests. Well, it's an MFJ, after all... I have also bought a few MJF; /archives//html/Amps/2012-09/msg00138.html (13,302 bytes)

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