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1. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Sun, 24 May 98 10:31:03 -0500; OK... This morning I did some experiments with stability on 10 meters on my 4-1000A amp. First I put in my original supressor design. This consisted of 3 3watt metal film resistors in parallel with a; /archives//html/Amps/1998-05/msg00545.html (9,920 bytes)
2. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Sun, 24 May 1998 12:57:31 +0000; To: <amps@contesting.com> What is the inductance of the resistors? Can you measure it? Alternative solutions: 1.) You could have added capacitance in series with the resistors to reduce 10 meter curr; /archives//html/Amps/1998-05/msg00546.html (10,893 bytes)
3. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Sun, 24 May 98 14:26:29 -0500; Haven't measured it. I probably could, but it's a good question. Definitely good suggestions. I'll think about it. For number one what value cap would one add in series? I haven't seen that before.; /archives//html/Amps/1998-05/msg00548.html (12,454 bytes)
4. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Sun, 24 May 1998 21:05:50 +0000; To: <amps@contesting.com> Hi Jon, I see many people using resistors they "think" are non-inductive only to find out they aren't. The days of off the shelf higher power non-inductive carbons are gone,; /archives//html/Amps/1998-05/msg00552.html (14,248 bytes)
5. [AMPS] Amplifier Experiments! (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 25 May 98 02:11:50 -0800; To: <amps@contesting.com> All resistors have an intrinsic amount of inductance. There is no such thing as a non-inductive resistor. Real Special Are "Non-inductive resistors" real science? Rich... R.; /archives//html/Amps/1998-05/msg00558.html (9,172 bytes)
6. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 10:03:31 -0500; Hmm...read again, Tom. I think my failure WAS a parasitic of some sort. To make a 3 watt, 1 Ohm metal film resistor fail, one would need several amps of current. To make a parallel combination of a; /archives//html/Amps/1998-05/msg00561.html (12,532 bytes)
7. [AMPS] Amplifier Experiments! (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 25 May 1998 08:24:40 +0100; If you connect the resistor to an MFJ-259 and some kind of jig to minimize the inductance of the leads, and then "sweep" the frequency up into the VHF range, the "Resistance" scale should give some i; /archives//html/Amps/1998-05/msg00563.html (9,427 bytes)
8. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 10:44:01 -0500; Well, given I don't have an MFJ-259, that would be difficult. My thought was to place a cap in parallel with the resistor and then measure the resonance with a dip meter. From there, one can calcula; /archives//html/Amps/1998-05/msg00564.html (9,404 bytes)
9. [AMPS] Amplifier Experiments! (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 25 May 98 11:56:26 -0800; At least 3A because they will dissipate 12w (3.46A) for 1 hour in free air and remain within 10% tolerance. Indeed, Jon. The one ohm 2w Matsushita MOF resistors will carry 2.5A for 1 hour (6.25w) in; /archives//html/Amps/1998-05/msg00565.html (10,391 bytes)
10. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 25 May 1998 17:49:17 +0000; To: <amps@contesting.com> Hi Jon, The saturated current of a 4-1000A is roughly 16 amperes. If the "parasitic" drove the screen and control grids to 1000 volts positive, and the anode was held at a f; /archives//html/Amps/1998-05/msg00568.html (12,109 bytes)
11. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 25 May 1998 17:49:17 +0000; To: <amps@contesting.com> That works well here. Dip meters tell you nothing about impedance. Wrong "tool", and not much of a tool at the very best. That's why they fell out of the mainstream long ago; /archives//html/Amps/1998-05/msg00569.html (9,406 bytes)
12. [AMPS] Amplifier Experiments! (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 25 May 98 17:17:23 -0800; To: <amps@contesting.com> How does he know that the peak current needed to blow the resistors was 16A? However, Mr. Rauch, when standard AC circuit analysis indicated that your statement about virtua; /archives//html/Amps/1998-05/msg00572.html (10,816 bytes)
13. [AMPS] Amplifier Experiments! (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 25 May 98 17:17:25 -0800; To: <amps@contesting.com> During the grate suppressor debate, Mr. Rauch stated that the highest grid resonance frequency was obtained when the grid was directly connected to chassis-gnd. However, a d; /archives//html/Amps/1998-05/msg00573.html (10,229 bytes)
14. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 22:40:31 -0500; [snip] Why would a gassy tube cause a resistor combination that should be able to carry several amperes of current to pop like a firecracker? Also, there is no blue glow of any kind whatsoever in th; /archives//html/Amps/1998-05/msg00574.html (14,309 bytes)
15. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 25 May 98 22:45:28 -0500; They fell out of the mainstream because better equipment came along. It's not that they didn't tell an accurate picture. A slotted line can give you a great reading of SWR but a network analyzer wil; /archives//html/Amps/1998-05/msg00575.html (9,594 bytes)
16. [AMPS] Amplifier Experiments! (score: 1): Author: Shawn Tayler" <stayler@powernet.net (Shawn Tayler); Date: Mon, 25 May 1998 22:03:17 -0700; I'll second that...They can take my GDO when they pry it from my cold dead fingers.... de Shawn N7LQ (formerly WB7TDI) DM09dp & DN01fa -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions; /archives//html/Amps/1998-05/msg00576.html (9,290 bytes)
17. [AMPS] Amplifier Experiments! (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 26 May 98 00:10:09 -0800; amen, Shawn. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-RE; /archives//html/Amps/1998-05/msg00577.html (9,129 bytes)
18. [AMPS] Amplifier Experiments! (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 26 May 1998 07:46:01 +0000; To: <amps@contesting.com> Hi Jon, Because the result of even the slightest amount of gas is the tube flashes over and conducts very heavily. The tube no longer has to depend on cathode emission, whic; /archives//html/Amps/1998-05/msg00579.html (14,928 bytes)
19. [AMPS] Amplifier Experiments! (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 26 May 98 07:25:06 -0800; To: <amps@contesting.com> Is gas gettered when a tube is connected to high-pot. tester? I thought that arcs vapourize material in the arc craters. During the grate parasitics debate, Disappearing Gas; /archives//html/Amps/1998-05/msg00580.html (9,784 bytes)
20. [AMPS] Amplifier Experiments! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 26 May 98 14:00:53 -0500; Interesting. Why would the tube suddenly arc when I was testing it on 15 meters while it was fine when I had tested it all day on 10 meters? Is the tube still usable or should I send it back to the; /archives//html/Amps/1998-05/msg00581.html (12,132 bytes)

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