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1. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Tue, 03 Apr 2001 17:54:50 -0500; The grid driven circuit is pretty simple. Matching the output at high voltages is another thing. You will need to run your 4-1000A at around 6KV idle to get good drive out of it. Mine runs at that. I; /archives//html/Amps/2001-04/msg00029.html (9,568 bytes)
2. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Tue, 03 Apr 2001 17:58:10 -0500; Tom is absolutely right here. There is no way that 100 Watts at 3500 Volts will give 2000 Watts PEP. I would believe 2000 Watts PEP INPUT power. Most of the old assembly ideas were based on a 3500 Wa; /archives//html/Amps/2001-04/msg00030.html (9,999 bytes)
3. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Tue, 03 Apr 2001 17:59:24 -0500; Phil's absolutely correct. Put your input circuits as close as possible to the tube. He's approximately correct on the impedance. The input circuits were tricky at least with my installation. A good; /archives//html/Amps/2001-04/msg00031.html (9,261 bytes)
4. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Tue, 03 Apr 2001 18:02:54 -0500; Why do you need a good bandswitch to prevent arcing at high voltages? The band switch should come AFTER the DC blocking cap. Therefore, as long as it can handle the circulating currents present in th; /archives//html/Amps/2001-04/msg00032.html (10,276 bytes)
5. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Tue, 03 Apr 2001 18:11:52 -0500; OK. A 6m amp will be more tricky. But the tube should still work OK. Stabilizing it might be more of a challenge, but since you are just using it in a 4 MHz wide or so bandwidth, it shouldn't be too; /archives//html/Amps/2001-04/msg00034.html (9,024 bytes)
6. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Tue, 03 Apr 2001 21:59:48 -0500; Yeah, I wrote it in a hurry and wasn't thinking clearly. You are absolutely correct. Call me a loser. I know some here will. Let me be the first to say it: Hoof and Mouth disease affects humans. I un; /archives//html/Amps/2001-04/msg00041.html (11,620 bytes)
7. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 07:35:29 -0500; The part numbers I am speaking of are the 850 and 850A and 851. I could not remember the numbers, and at the time I did not have time to dig out my data sheet on them. It's been a while. The 850 has; /archives//html/Amps/2001-04/msg00056.html (14,617 bytes)
8. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 08:16:25 -0500; I went and dug into my memory archives a little more and I also woke up a little more. It appears from the text I wrote below that my primary motivation for using the "L-coil" as a I call it or step; /archives//html/Amps/2001-04/msg00057.html (17,029 bytes)
9. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 08:41:34 -0500; One more thing, Bob. Since the plate impedances the 850A and 851 (I know not about the 852) are designed for are 2000 to 4000 Ohms, it matters not at which plate voltage you use them except for the f; /archives//html/Amps/2001-04/msg00059.html (10,188 bytes)
10. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 09:51:50 -0500; Actually, Rich, that is incorrect. There is a malady that affects humans that is similar to Mad Cow. It is believed to be linked to the eating of tainted beef. But there have been few cases and the l; /archives//html/Amps/2001-04/msg00062.html (9,210 bytes)
11. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (na9d@mindspring.com); Date: Wed, 04 Apr 2001 16:07:31 -0400; Tom, What I was saying was that Bob was claiming that one switch worked at 3000 V and the other at 6000 Volts. My statement was that his comment and thinly veiled insult about running the "6000 Volt"; /archives//html/Amps/2001-04/msg00074.html (11,256 bytes)
12. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 18:31:10 -0500; I'll try. I used 12 purely as an example, not as a statement of what I actually have. The fact is that if you look at the values of inductance in the 850A and what is needed from calculated values of; /archives//html/Amps/2001-04/msg00079.html (12,167 bytes)
13. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 18:32:50 -0500; I'd agree Phil, but then again, it's not the "stock" B&W, but a modified one. That was the point I was trying to make in the first place! 73, Jon NA9D -- Jon Ogden NA9D (ex: KE9NA) Member: ARRL, AMSA; /archives//html/Amps/2001-04/msg00080.html (9,542 bytes)
14. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 21:43:59 -0500; I agree, Tom. But a Q of say, 40 would certainly be too high, would it not? 73, Jon NA9D -- Jon Ogden NA9D (ex: KE9NA) Member: ARRL, AMSAT, DXCC, NRA http://www.qsl.net/ke9na "A life lived in fear is; /archives//html/Amps/2001-04/msg00085.html (8,984 bytes)
15. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Wed, 04 Apr 2001 22:47:55 -0500; Actually, adding the coil actually INCREASES the total output capacitance of the anode circuitry (Ctube + Csocket +Chousing). However, it decreases the impedance. Since you are adding a series reacta; /archives//html/Amps/2001-04/msg00087.html (10,386 bytes)
16. [AMPS] 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Thu, 05 Apr 2001 06:37:45 -0500; Phil, VERY, VERY, VERY good advice. It's always best to check twice and then touch. The safety guidelines to remove all metal objects while working on HV, keeping one hand in your back pocket are all; /archives//html/Amps/2001-04/msg00098.html (10,339 bytes)
17. [AMPS] Re: 4-1000A Project (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Thu, 05 Apr 2001 06:59:36 -0500; The reason I see the varying gains across the bands on my amp is probably two-fold: Input networks and output network. My input pi-nets are not in an ideal location and are not as close to the tube a; /archives//html/Amps/2001-04/msg00100.html (7,957 bytes)
18. [AMPS] Dayton amps people (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Thu, 12 Apr 2001 07:05:37 -0500; Peter, We missed your bartending abilities last year! Can't wait to see you again. Our suite at SMC is always an excellent time! The Society of Midwest Contesters rocks! :-) 73, Jon NA9D -- Jon Ogden; /archives//html/Amps/2001-04/msg00265.html (7,755 bytes)
19. [AMPS] silver (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Sat, 14 Apr 2001 11:03:32 -0500; Silver is typically used to help improve loss characteristics, but as others have said, silver doesn't do much at HF. On VHF/UHF and above, it makes a big difference. The heat is just losses in the c; /archives//html/Amps/2001-04/msg00327.html (8,732 bytes)
20. [AMPS] silver (score: 1): Author: na9d@mindspring.com (Jon Ogden); Date: Sat, 14 Apr 2001 22:37:48 -0500; Yes, Dave. I think you can. In fact, I have done it and have DXCC via hairdryer. Have you done that? Jon -- Jon Ogden NA9D (ex: KE9NA) Member: ARRL, AMSAT, DXCC, NRA http://www.qsl.net/ke9na "A life; /archives//html/Amps/2001-04/msg00337.html (7,649 bytes)

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