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261. [Amps] Old Power tubes (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 05 May 2005 15:12:23 -0400; Speaking of finding old power tube data. In the 1960's I paid $10 for a used ML6623. I have lost the data to it. But it is similar to the 5762 in many ways but the filament is 6 volts at 60 amps. Thi; /archives//html/Amps/2005-05/msg00090.html (7,332 bytes)
262. [Amps] Strip-X enamel wire stripper (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 10 May 2005 13:22:39 -0400; Need to know what can be used as a substitute for Strip-x. Have access to just about any organic compound or solvent. But, what should one use? Strip-x was a mixture of several organic solvents but I; /archives//html/Amps/2005-05/msg00151.html (6,345 bytes)
263. [Amps] Dayton Hamvention (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 13 May 2005 08:19:26 -0400; If each of you that is attending the Dayton Hamvention would send me an email; I will be happy to compile the list and send it out in one email to reduce the clutter. Please include: Frequency you ma; /archives//html/Amps/2005-05/msg00165.html (6,518 bytes)
264. [Amps] Dayton Hamvention (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 18 May 2005 11:55:17 -0400; I did not have time to nicely format this information. Here are the emails I received. 73 Bill Bill WA4LAV Outdoor Flea Market Space 2905 Cell Phone Number (if I have it on) 859 948-6671 This is the; /archives//html/Amps/2005-05/msg00206.html (12,331 bytes)
265. [Amps] Heathkit HA-14 filaments (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 31 May 2005 09:29:49 -0400; To my surprise I found that the filaments of the HA-14 were not driven by a center-tapped AC filament transformer when using the AC power supply. I can see that this can be a real source of 60 Hz mod; /archives//html/Amps/2005-05/msg00325.html (6,539 bytes)
266. Re: [Amps] Heathkit HA-14 filaments (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 01 Jun 2005 11:52:30 -0400; I am a bit surprised that I did not get any response to my email about the non-center-tapped filament in the HA14. The two 572B tubes have their filaments wired in series one end of the string ground; /archives//html/Amps/2005-06/msg00002.html (8,873 bytes)
267. Re: [Amps] Screen (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 03 Jun 2005 09:40:34 -0400; You can never use fconstant screen current. This can cause serious chaotic behavior. However, the plate voltage should not be allowed to approach the screen voltage. This is where the characteristic; /archives//html/Amps/2005-06/msg00007.html (7,263 bytes)
268. Re: [Amps] Screen (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 03 Jun 2005 10:29:54 -0400; I think we are talking about two different curves. 1. V-I curve of plate with constant bias voltages ( this determines how good the constant current sink is over a range of plate voltages) you must s; /archives//html/Amps/2005-06/msg00008.html (7,643 bytes)
269. [Amps] GE ham news (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 03 Jun 2005 11:46:33 -0400; There was an amplifier for sale you know where ( a four letter word starting with e ending with y). It went for much more than I expected. However, the design was interesting. In the description GE H; /archives//html/Amps/2005-06/msg00009.html (6,366 bytes)
270. Re: [Amps] GE ham news (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 03 Jun 2005 12:28:57 -0400; I agree. I was hoping that someone had them available on the internet. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2005-06/msg00011.html (7,198 bytes)
271. Re: [Amps] copper or silver in tank circuit? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 17 Jun 2005 09:39:41 -0400; I don't know what all this fuss is about. Sure plating has an effect on UNLOADED Q. But, once it is loaded, the load resistance is the dominating factor when it comes to Q of a HF amplifiers tank cir; /archives//html/Amps/2005-06/msg00131.html (10,892 bytes)
272. Re: [Amps] RE : copper or silver in tank circuit? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 17 Jun 2005 10:35:18 -0400; Gold has low conductance, but gold plating is usually very thin. Since it has low conductivity it has greater skin depth and since gold plating is usually around a micron thick most of the current fl; /archives//html/Amps/2005-06/msg00133.html (11,229 bytes)
273. [Amps] Henry Radio Amplifier (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 20 Jun 2005 12:57:34 -0400; A widow of a SK wants to sell a 2k-5 that he as modified to a 3k-5. It uses OEM labeled 8877's that he got from a MRI lab (with a spare or two). The only problem I am aware of is that he could not fi; /archives//html/Amps/2005-06/msg00165.html (6,674 bytes)
274. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 22 Jun 2005 09:04:05 -0400; You can go to wallmart and get a Panasonic "Inverter" microwave oven for about $60. It contains a 1500 watt SMP. But there are a few problems: 1. The output is negative around 4 or 5 Kv and very unre; /archives//html/Amps/2005-06/msg00174.html (10,151 bytes)
275. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 22 Jun 2005 14:06:16 -0400; If it is off while receiving what difference would it make. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li; /archives//html/Amps/2005-06/msg00177.html (8,906 bytes)
276. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 22 Jun 2005 14:09:34 -0400; I'd assume that the power supply would be put into a box with line filters and DC filters as well. You want to make sure that there is no 40 KHz switching noise on the HV to the amplifier because it; /archives//html/Amps/2005-06/msg00178.html (9,256 bytes)
277. Re: [Amps] New SGC Mini Lini Uses Class E Technology (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Sat, 02 Jul 2005 20:20:31 -0400; I have some questions. Why does the plug-in band module need so much cooling air and what are the drive requirements? You realize that this adds to the DAF discussion. Which practically does the same; /archives//html/Amps/2005-07/msg00014.html (8,759 bytes)
278. Re: [Amps] New SGC Mini Lini Uses Class E Technology (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 05 Jul 2005 12:24:54 -0400; My point was, that if the band modules were only passive devices why cooling at all? And then I realized the Power MOSFET must be in the band module. Tuning is critical in Class-E amplifiers and perh; /archives//html/Amps/2005-07/msg00026.html (11,892 bytes)
279. Re: [Amps] New SGC Mini Lini Uses Class E Technology (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 14 Jul 2005 14:18:01 -0400; I have not heard any more about this. Has anyone gotten any technical information about this product? 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2005-07/msg00156.html (9,077 bytes)
280. Re: [Amps] 4CX250 bases (David Kirkby) (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 22 Jul 2005 15:39:18 -0400; I have often wondered if strong RF fields ever mess up the brushless motor's internal controllers? 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2005-07/msg00264.html (7,539 bytes)

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