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141. Re: [Amps] making sinks black (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 22 Jul 2006 17:00:47 -0400; That might be true. Very often the largest portion of cooling is through contact with moving air. This is the same as several others have said, but it might be useful to repeat it anyway in differen; /archives//html/Amps/2006-07/msg00896.html (8,136 bytes)
142. Re: [Amps] making sinks black (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 22 Jul 2006 20:47:02 -0400; Excellent point! Thanks for opening my eyes on this. The interesting thing is this is how grounding systems and antennas work also. Radiation from an antenna has nothing to do with how much stuff yo; /archives//html/Amps/2006-07/msg00898.html (8,265 bytes)
143. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 22 Jul 2006 23:04:56 -0400; Well, I can copy and post authoritative text in several peer reviewed textbooks written by well known authors that disagrees with your claims Will...but I doubt it will do much good. I guess we will; /archives//html/Amps/2006-07/msg00907.html (8,540 bytes)
144. [Amps] grid fuse and contact potential bias link (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 00:49:21 -0400; In the interest of good science and because many people don't have access to some of the better vacuum tube engineering texts, I took a few minutes to put a short page up about grid fuses, contact bi; /archives//html/Amps/2006-07/msg00910.html (8,386 bytes)
145. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 05:58:33 -0400; Not quite a peer reviewed engineering text is it Will? 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00920.html (7,384 bytes)
146. [Amps] 572B grid (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 12:19:45 -0400; I tried to get a custom 572 manufactured with both grid leads extended into the socket, but it never happened. That alone would have been a major improvement. 73 Tom ________________________________; /archives//html/Amps/2006-07/msg00941.html (8,828 bytes)
147. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 12:24:28 -0400; Carl, The problem with that is, as Peter points out, the single grid lead inside the tube is very thin and very long. This severely limits anything we can do outside the tube, since that connection; /archives//html/Amps/2006-07/msg00943.html (8,760 bytes)
148. Re: [Amps] The maximum amount of 811As and 572Bs in parallel (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 15:17:30 -0400; The real issue is feedback capacitance, not output capacitance. Amplifiers using two tubes are barely stable on upper HF because feedthrough capacitance is far too high. Four tubes actually require; /archives//html/Amps/2006-07/msg00964.html (8,445 bytes)
149. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 16:48:00 -0400; True enough, and the text looks really good at first glance. But I still trust peer reviewed engineering textbooks more, especially when they all agree with each other. 73 Tom ______________________; /archives//html/Amps/2006-07/msg00973.html (8,847 bytes)
150. Re: [Amps] Pi network tuning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 23 Jul 2006 22:10:11 -0400; You won't know the impedance transformation, just resonance. The normal procedure is to terminate the anode to ground with the expected tube operating load impedance and check for 50 ohms at the out; /archives//html/Amps/2006-07/msg00980.html (7,772 bytes)
151. Re: [Amps] the radio handbook by mr orr w6sai and amps (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 06:11:41 -0400; So far as what I have noticed there are very few changes after the very early editions. I have several copies (15th through 22nd) and have not noticed significant change. 73 Tom ____________________; /archives//html/Amps/2006-07/msg01003.html (8,339 bytes)
152. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 06:33:14 -0400; No one I saw ever said "it won't ever work" in the sense that the user would notice a problem. What most people said is it is a very bad idea, certainly not the best way to protect things, and may a; /archives//html/Amps/2006-07/msg01004.html (12,066 bytes)
153. Re: [Amps] Pi network tuning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 07:18:34 -0400; Mike, First thing you should keep in mind is the optimum tube load impedance, loaded Q, and the Q you need are all just approximations. There isn't any need to get over-precise with what amount to a; /archives//html/Amps/2006-07/msg01005.html (9,035 bytes)
154. Re: [Amps] grid fuses (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 10:43:33 -0400; Chris, I already posted it a couple day ago and posted the link on this site. I was up at 1AM doing that, so I remember it pretty well. http://www.w8ji.com/fusing_and_floating_grids.htm 73 Tom _____; /archives//html/Amps/2006-07/msg01016.html (10,027 bytes)
155. Re: [Amps] Pi network tuning (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 10:52:03 -0400; All sounds good. If the tubes have conical grid supports and very low lead length it should be very stable. You probably won't even need a suppressor if the grids are compact with short wide connecti; /archives//html/Amps/2006-07/msg01017.html (9,080 bytes)
156. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 17:46:17 -0400; Hi Will, Rather than you and Rich make wild guesses about gettering in a 3-500Z, why not give Eimac a call and ask them what the gettering material was in a 3-500Z? If Paul Larson still works there; /archives//html/Amps/2006-07/msg01032.html (11,079 bytes)
157. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 19:48:59 -0400; <It's impossible to run one temperature on zirconium. I guess Eimac is lucky they quit making 3-500Z's, since the gray power on the anode is the getter and it is zirconium. The text of the page in th; /archives//html/Amps/2006-07/msg01046.html (10,455 bytes)
158. [Amps] Zirconium (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 20:05:32 -0400; (1) http://www.thevalvepage.com/valvetek/getter/getter.htm Will, I wonder if you aren't a little confused on this topic. You said above " It's impossible to run one temperature on zirconium. It's op; /archives//html/Amps/2006-07/msg01047.html (11,779 bytes)
159. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 24 Jul 2006 21:23:47 -0400; I have a later edition. Later editions almost always have improvements. You should rewrite his text then if you know what he meant to say. 73 Tom _______________________________________________ Amps; /archives//html/Amps/2006-07/msg01051.html (10,441 bytes)
160. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 25 Jul 2006 06:09:27 -0400; Keith,. There are two major types of faults. One is RF generated where the grid has excessive drive from RF (alternating current) drive, the other is a hard fault caused by a flashover. There are mu; /archives//html/Amps/2006-07/msg01070.html (13,975 bytes)

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