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21. Re: [Amps] Anyone build a GU5B? (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 04 Oct 2007 17:40:06 -0700; I'd like to find one like that myself. Seems like there just aren't many choices that meet those criteria these days. In fact I was just thinking about asking the list if anyone had any ideas. I'm ti; /archives//html/Amps/2007-10/msg00049.html (7,688 bytes)
22. [Amps] PEP Wattmeters (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 18 Oct 2007 17:15:48 -0700; My latest project is a custom wattmeter setup for 5 VHF/UHF bands using Bird components. (5 line sections, one meter). I thought I might as well make it a peak reading meter as long as I was building; /archives//html/Amps/2007-10/msg00219.html (7,110 bytes)
23. Re: [Amps] PEP Wattmeters (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 18 Oct 2007 19:48:20 -0700; John, Yeah, that's the sort of thing I'm looking for. That exact circuit is not suitable for my application but the concept is close. Marv gave enough design details to help. I have seen this page be; /archives//html/Amps/2007-10/msg00222.html (8,159 bytes)
24. Re: [Amps] PEP Wattmeters (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 19 Oct 2007 07:55:33 -0700; Alex, Yes! Exactly why I'm looking at as many schematics as I can find. The time constants are everything. Most of the kludge jobs I've seen over the years did a very poor job of catching the true pe; /archives//html/Amps/2007-10/msg00226.html (9,472 bytes)
25. Re: [Amps] Bird 1KW+ Load Resistor (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sun, 11 Nov 2007 06:54:05 -0800; I ran into this problem with a model 883 load. The people at Bird were actually pretty nasty about giving me any help at all. They claimed they didn't support old models and since they were "inexpens; /archives//html/Amps/2007-11/msg00147.html (8,814 bytes)
26. Re: [Amps] expensive mistakes (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 21 Dec 2007 14:00:14 -0800; Use tubes! Larry - W7IUV DN07dg http://w7iuv.com _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-12/msg00191.html (7,634 bytes)
27. Re: [Amps] HV Supplies and Diodes (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 03 Jan 2008 11:36:05 -0800; FWIW department: Some observations noted over the last 40+ years designing, building, and testing power supplies: Determining the required ratings for power supply rectifiers, no matter if they are v; /archives//html/Amps/2008-01/msg00034.html (15,365 bytes)
28. [Amps] Amperex 3-500Z (score: 1): Author: Larry <larry@w7iuv.com>; Date: Wed, 30 Jan 2008 11:48:52 -0800; I need some help determining exactly what I have. The tubes in question are a pair of NIB Amperex 8802/3-500Z (NOT ZG!) They are date coded 1980. My short form Amperex catalog dated 1969 shows the 88; /archives//html/Amps/2008-01/msg00262.html (7,419 bytes)
29. [Amps] More Amperex 3-500Z (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 31 Jan 2008 08:36:47 -0800; Thanks to all that replied with info. I had hoped there would be more definitive data, but the mystery still remains. Here's what I know for sure: In 1969 Amperex was owned by North American Phillips; /archives//html/Amps/2008-01/msg00270.html (8,858 bytes)
30. Re: [Amps] More Amperex 3-500Z (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 31 Jan 2008 09:53:02 -0800; Carl, Thanks. Good data points. Do you have a publication date on that Drake manual? (approx OK) Can you approximate the date/year you observed the comparative operation in the SB-220? My 1969 short; /archives//html/Amps/2008-01/msg00272.html (12,272 bytes)
31. Re: [Amps] Amperex triode (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 31 Jan 2008 10:26:34 -0800; John, No, I have not tried to email them. If fact, I don't have any contact info for Covimag at all (yet). It would be my guess they would not be forth coming with historical info from 1980 and, sinc; /archives//html/Amps/2008-01/msg00274.html (12,134 bytes)
32. [Amps] Silver (score: 1): Author: Larry <larry@w7iuv.com>; Date: Mon, 11 Feb 2008 11:24:21 -0800; What's a good way to clean up silver plated copper without damaging the plating? I have a coil that I need to make more "photogenic" but don't want to destroy it in the process. Usually don't bother; /archives//html/Amps/2008-02/msg00054.html (6,801 bytes)
33. Re: [Amps] Silver (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 12 Feb 2008 15:12:28 -0800; Thanks to all those who responded with suggestions. Photo Shop is probably the best answer, but since I have no artistic ability at all, is not an option. Two bottles of Tarn-x were purchased (expens; /archives//html/Amps/2008-02/msg00068.html (8,520 bytes)
34. Re: [Amps] Much ado about silver (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 12 Feb 2008 16:43:29 -0800; Right. Normally I wouldn't bother, but this time I need to have it look good. Strictly an appearance issue, but necessary in this instance. Larry - W7IUV DN07dg http://w7iuv.com _____________________; /archives//html/Amps/2008-02/msg00072.html (7,193 bytes)
35. [Amps] Turns counting dials (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 14 Feb 2008 08:33:12 -0800; Is there currently a good source for turn counting dials similar to the old Groth type? I'm looking for something that has the mechanism on the front side of the panel. I have several dials but they; /archives//html/Amps/2008-02/msg00094.html (6,427 bytes)
36. Re: [Amps] grid bias supply (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sun, 16 Mar 2008 13:08:01 -0700; Yes, it is. There is great value in being able to adjust your bias to allow more efficient operation while running non-linear modes such as CW, RTTY, and the various WSJT modes. Class B or even soft; /archives//html/Amps/2008-03/msg00139.html (7,665 bytes)
37. [Amps] 3-500Z filament voltage and current (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 10 Apr 2008 14:54:23 -0700; Question for those with more experience in this particular area than I have: The Eimac spec sheet sez 5.0 +/- 0.25 volts measured at the socket. Do they really mean the socket contacts or the tube pi; /archives//html/Amps/2008-04/msg00156.html (8,741 bytes)
38. Re: [Amps] 3-500Z filament voltage and current (score: 1): Author: Larry <larry@w7iuv.com>; Date: Fri, 11 Apr 2008 08:06:13 -0700; Quite a few off-list comments were received, so rather than reply to each individual, I'll just say thanks to all who responded and summarize. The consensus on filament voltage was that 4.8 was OK bu; /archives//html/Amps/2008-04/msg00170.html (7,256 bytes)
39. Re: [Amps] Fwd: Re: Input Coils...SB-220 (score: 1): Author: Larry <larry@w7iuv.com>; Date: Tue, 01 Jul 2008 16:34:07 -0700; Jeff, Works fine here. Used I.E., Firefox, and Opera. All browsers opened everything and displayed it fine. 73, Larry Larry - W7IUV DN07dg http://w7iuv.com ___________________________________________; /archives//html/Amps/2008-07/msg00009.html (7,895 bytes)
40. [Amps] Amp Pix (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sat, 12 Jul 2008 08:29:08 -0700; Since I know all you guys love to look at photos of naked amplifiers, I have uploaded a photo essay of my latest project to my web page. http://w7iuv.com It's a pair of 3-500Z's, nothing really speci; /archives//html/Amps/2008-07/msg00113.html (6,370 bytes)

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