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41. Re: [Amps] Linear Amplifiers (score: 1): Author: kg7hf@comcast.net; Date: Mon, 01 Dec 2008 22:00:23 +0000; Hi Eddie and Chas, Each to their own, but I would add one other aspect that might be a great skill builder. Recently I've had a great time troubleshooting broken rigs. While not explicitly "home brew; /archives//html/Amps/2008-12/msg00021.html (10,602 bytes)
42. [Amps] amp repair/modification (score: 1): Author: kg7hf@comcast.net; Date: Tue, 02 Dec 2008 17:26:50 +0000; Hi everyone, Speaking of homebrew & repair, I have a general question I would like to throw out to the group. I have a junker HF amp (160 - 10m) which use a pair of 3-500z tubes (g-g obviously), the; /archives//html/Amps/2008-12/msg00040.html (7,793 bytes)
43. Re: [Amps] Linear Amps (score: 1): Author: kg7hf@comcast.net; Date: Wed, 03 Dec 2008 02:58:10 +0000; Maybe not. I've recently had the joy of bringing in a number of new and younger hams into the hobby. The number one thing that they have talked about is building things. In fact, almost every scout; /archives//html/Amps/2008-12/msg00058.html (10,931 bytes)
44. Re: [Amps] Linear Amps (score: 1): Author: kg7hf@comcast.net; Date: Wed, 03 Dec 2008 16:50:12 +0000; Yes, I believe it does. The thought processes involved in home brew (and other activities within the hobby), i.e. creative thinking, problem solving, and attention to detail all apply to any emergen; /archives//html/Amps/2008-12/msg00072.html (10,792 bytes)
45. Re: [Amps] Amps Digest, Vol 73, Issue 32 (score: 1): Author: kg7hf@comcast.net; Date: Wed, 21 Jan 2009 18:58:13 +0000; I believe Hsu is correct, the 3cx1500D7 is "designed" to replace two 3-500z's. Not quite a direct replacement, but close. Airflow is still going to be an issue to address, but at least power requirem; /archives//html/Amps/2009-01/msg00214.html (7,889 bytes)
46. Re: [Amps] 3CX1500D3 Triode on QTH.com (score: 1): Author: kg7hf@comcast.net; Date: Wed, 04 Feb 2009 22:32:03 +0000; That is what I was going to say, you beat me to it Carl. Actually, I picked one up for $50 to just play with and see what happens, figured I couldn't go too wrong. Paul KG7HF Message: 8 Date: Wed, 4; /archives//html/Amps/2009-02/msg00097.html (7,758 bytes)
47. Re: [Amps] 3CX800 filament voltage (score: 1): Author: kg7hf@comcast.net; Date: Mon, 09 Feb 2009 22:25:31 +0000; Maybe a silly question but... Why not just us a voltage regulator? 13.5V x 1.5A seems pretty easy to do and can be dialed in exactly. or...pwm buck-bust configuration so that both high and low Vin ca; /archives//html/Amps/2009-02/msg00251.html (8,720 bytes)
48. Re: [Amps] 160m mod to SB220 (score: 1): Author: kg7hf@comcast.net; Date: Tue, 17 Feb 2009 22:30:01 +0000 (UTC); I don't think there are any mars frequencies that fall inside the amateur frequencies. What happens when you try to tune up the SB-220 on one of the mars frequencies? I would think you can easily tu; /archives//html/Amps/2009-02/msg00538.html (8,878 bytes)
49. Re: [Amps] Any Henry experts on the list? (score: 1): Author: kg7hf@comcast.net; Date: Thu, 19 Feb 2009 16:48:30 +0000 (UTC); Hi Chaz, I figured others might be able to chime in. My favorite is the AM-3924. It is part of the AN/URT-23 transmitter set used on many Navy ships. The amplifier section has fixed caps and coil; /archives//html/Amps/2009-02/msg00562.html (7,664 bytes)
50. Re: [Amps] Henry expert on list? (score: 1): Author: kg7hf@comcast.net; Date: Thu, 19 Feb 2009 21:23:09 +0000 (UTC); I think the Harris RF 110 is basically the urt-23...you can't kill them, and they will work from 1.8 to 30.0 Mhz to produce over legal limit. On the uss georgia, w e always tweaked ours to about 25; /archives//html/Amps/2009-02/msg00576.html (7,844 bytes)
51. [Amps] HV measurements (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 9 Mar 2009 18:12:25 +0000 (UTC); Hi guys, A simple question. I'm wondering what people are using the measure HV? Do you guys typically look at the HV DC on a scope at all? My DMM only goes to 1KV DC, so I'm curious as to what i; /archives//html/Amps/2009-03/msg00255.html (7,118 bytes)
52. Re: [Amps] HV measurements (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 9 Mar 2009 20:58:31 +0000 (UTC); Thanks to everyone who answered, lots of good answers, I now have some options! Sure beats the $800 scope probe I was looking at (for about a mSec). _______________________________________________; /archives//html/Amps/2009-03/msg00261.html (7,103 bytes)
53. [Amps] 6m amp based on W1QWJ (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 10 Mar 2009 04:55:34 +0000 (UTC); Hi gents, Thanks for the HV responses, great advice. So I'm embarking on a reproduction of W1QWJ (sk) 6m amplifier using a 3cx800A7, it's in the 1995 ARRL handbook. This will be my first full up h; /archives//html/Amps/2009-03/msg00268.html (7,480 bytes)
54. [Amps] Tokyo Hy-Power HL-2.5KFX (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 10 Mar 2009 13:40:38 +0000 (UTC); Hi Riki, I don't own a complete HL-2.5KFX, however after reading the QEX article I contacted Nobuki Wakabayashi (JA1DJW) via email and asked him many questions. He sent me a box full of hard to fi; /archives//html/Amps/2009-03/msg00272.html (7,873 bytes)
55. Re: [Amps] 6m amp based on W1QWJ (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 10 Mar 2009 13:58:00 +0000 (UTC); Thanks everyone, great information, The sure did look like DC blocking, so I guess they would be effective at blocking RF as well. The symbol threw me into a tail spin though, try to find that in a; /archives//html/Amps/2009-03/msg00273.html (8,231 bytes)
56. [Amps] HV PS transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 11 Mar 2009 16:02:08 +0000 (UTC); GM gents, Part of my (3cx800A7) amplifier project is to do something "new". Well OK, it's old, but new to me. I'm trying to reproduce the switch mode power supply outlined by Tim Hullick W9QQ (SK); /archives//html/Amps/2009-03/msg00308.html (8,414 bytes)
57. Re: [Amps] HV PS transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 11 Mar 2009 16:41:07 +0000 (UTC); Hi Ray, Interesting, I don't know if he has a kit for this or not, I haven't found much. It is pretty basic design and the parts are completely un-obtainable so I've had to do quite a bit of rework; /archives//html/Amps/2009-03/msg00316.html (11,040 bytes)
58. Re: [Amps] [amps]SB200 on 6m & my take (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 13 Mar 2009 18:48:20 +0000 (UTC); I've started this email three times now... You guys on the list have always been a great help and resource for me. This subject comes up every few months, but JEEZ....what the HELL is the problem w; /archives//html/Amps/2009-03/msg00395.html (8,358 bytes)
59. [Amps] w1qwj 6m Amp + W9QQ smps (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 16 Mar 2009 02:20:49 +0000 (UTC); Hello amp builders. An update and a couple more questions. A version of the w9qq power supply is moving forward, not quite at warp speed, but forward none the less. The clock module and clock ampli; /archives//html/Amps/2009-03/msg00433.html (8,291 bytes)
60. [Amps] Dentron mla-2500 meters (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 16 Mar 2009 21:31:18 +0000 (UTC); Hi all, Any suggestions on replacement meters for a Dentron MLA-2500? They don't have to be exact, I'll have a new faceplate, but close would be nice. thanks and 73, Paul, kg7hf __________________; /archives//html/Amps/2009-03/msg00448.html (6,956 bytes)

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