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81. [AMPS] Gassy Tubes and Gas Arcs (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 18 May 98 09:46:05 -0500; So you are saying that the glow is happening INSIDE the structure of the glass itself? Interesting. I'll have to check and see about that. 73, Jon KE9NA -- Jon Ogden jono@webspun.com www.qsl.net/ke9; /archives//html/Amps/1998-05/msg00319.html (8,507 bytes)
82. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 18 May 98 16:26:12 -0500; Time varying resistance of the anode? You must be suggesting that the anode impedance changes over the RF conduction cycle. However, most specs sheets always list the anode impedance around a couple; /archives//html/Amps/1998-05/msg00325.html (13,623 bytes)
83. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 18 May 98 20:56:56 -0500; Dick, GREAT posting. Really good! He's very brilliant. And has the patience to teach some of us knuckleheads (like me) a thing or two! Agreed. Again, agreed. This was one of my original conclusions a; /archives//html/Amps/1998-05/msg00328.html (11,916 bytes)
84. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 18 May 98 22:39:43 -0500; Larry, You can never go wrong having leads as short as possible. Building an HF amp with GHz techniques is a great way to go. Can't really go wrong there. While it doesn't guarantee stability, it su; /archives//html/Amps/1998-05/msg00330.html (9,549 bytes)
85. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 19 May 98 09:58:52 -0500; The 200 nH is inductance for the anode lines to the blocking cap were a guess by Ian. So the inductance is less. It still doesn't change the mathematical principles. Also, as we have discussed recen; /archives//html/Amps/1998-05/msg00349.html (9,250 bytes)
86. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 19 May 98 10:04:39 -0500; To: <amps@contesting.com> Arrgh! I thought we worked through all that math! Gain is directly proportional to Rp. Rp is different from the R of the supressor resistor. Did you not just read Ian's note; /archives//html/Amps/1998-05/msg00353.html (9,987 bytes)
87. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 19 May 98 11:32:50 -0500; Ok...I wasn't really trying to impune you. Just to make a point that I didn't feel your comment initially correct. It wasn't meant to be an insult. OK, that makes sense. Yes. Agreed. Yes, you are ri; /archives//html/Amps/1998-05/msg00358.html (13,678 bytes)
88. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 19 May 98 15:08:15 -0500; Well, OK. It's certainly not how I designed my amps. While it's hard (damn near impossible) to measure S22 in a high power amplifier, we would always figure that we were pretty well matched when our; /archives//html/Amps/1998-05/msg00361.html (10,132 bytes)
89. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 20 May 98 00:30:50 -0500; So Rich, are you saying that textbooks are incorrect? As I thought more about this, I realized that purely reactive networks do indeed make one load look like another. For example, we make a 3500 Oh; /archives//html/Amps/1998-05/msg00371.html (10,025 bytes)
90. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 20 May 98 11:16:04 -0500; Do you grasp the concept of series to parallel conversions? If transforming 100 Ohms to 100K Ohms is a stretch, then how do you explain how a pi-net transforms a 3.5 KOhm output impedance of a tube; /archives//html/Amps/1998-05/msg00389.html (8,907 bytes)
91. [AMPS] Resonances (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 20 May 98 11:18:52 -0500; It can definitely change. Especially impedances at higher frequencies, etc. That's the tough part about RF. I think you measured a capacitor. These are less affected by nearness to other components,; /archives//html/Amps/1998-05/msg00391.html (8,117 bytes)
92. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 09:29:44 -0500; Tom, The small signal level present on one of these instruments will do nothing to tell you the impedance of the cathode of a tube. I took the suggestion from a ham article to use an RX noise bridge; /archives//html/Amps/1998-05/msg00423.html (9,793 bytes)
93. [AMPS] parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 09:45:45 -0500; Peter, I am not saying I fully buy the parasitic theory....but.... Wouldn't an arc do fairly extreme damage like melting the grid or even vaporizing part of it? The post by John Lyles seemed to indi; /archives//html/Amps/1998-05/msg00424.html (9,287 bytes)
94. [AMPS] Generic: low out on 10m (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 09:59:28 -0500; This is a BIG potential problem. Good point, Tom. My original Hammond 1521 choke in my 4-1000A kept blowing up on 10 m. I also got out only a few hundred watts. Then a put a GDO on the choke. Amazin; /archives//html/Amps/1998-05/msg00425.html (7,269 bytes)
95. [AMPS] Technical Question #1 (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 10:04:11 -0500; I don't want to say that I am denying that Tom may have changed his story. So, let me ask the question. Maybe we can get to the truth: Tom: Did you say that you have seen parasitic oscillation damag; /archives//html/Amps/1998-05/msg00426.html (9,929 bytes)
96. [AMPS] Technical Question #1 (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 10:07:05 -0500; Agreed. Why is Tom unwilling to give his technical opinion on a seemingly simple question. So we don't have all the facts. So what. Hypothesize, Tom. Please don't use the red herrings any more. 73,; /archives//html/Amps/1998-05/msg00427.html (9,276 bytes)
97. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 10:54:04 -0500; One of Murphy's Laws of Electrical Engineering: The fuse that is intended to protect a circuit will actually be protected by the circuit itself blowing up. 73, Jon KE9NA -- Jon Ogden jono@webspun.co; /archives//html/Amps/1998-05/msg00431.html (9,044 bytes)
98. [AMPS] Technical Question #1 (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 11:43:40 -0500; I believe there is some neutralization that can be done in GG amps. The most important aspect I recall has to do with making sure that there is a balance between the two tubes. A single tube amp nee; /archives//html/Amps/1998-05/msg00440.html (9,908 bytes)
99. [AMPS] RE: huh? (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 18:17:35 -0500; Where I think Rich errored and meant to say 100+j0 and 100K+j0. So, George has given the correct answer to the question asked. 73, Jon KE9NA ps: Bandwidth? What bandwidth....The internet backbones a; /archives//html/Amps/1998-05/msg00444.html (8,146 bytes)
100. [AMPS] parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 21 May 98 18:23:55 -0500; It still doesn't answer the fundamental question: * According to literature (as posted by John Lyles), it is stated that gas arcs usually cause SEVERE damage to a tube, as in melted grids, fused gri; /archives//html/Amps/1998-05/msg00445.html (10,676 bytes)

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