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41. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sat, 18 Jan 2014 10:08:47 -0800; ORIGINAL MESSAGE: (may be snipped) n 1/18/2014 9:52 AM, Jim Garland wrote: There is another problem, which can come from stray capacitance. At 28MHz, stray capacitance of only 1-2pF can turn the shor; /archives//html/Amps/2014-01/msg00136.html (10,536 bytes)
42. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sat, 18 Jan 2014 10:18:47 -0800; ORIGINAL MESSAGE: (may be snipped) n 1/18/2014 9:52 AM, Jim Garland wrote: I agree that one shouldn't leave the unused segments of of a tank coil completely floating, and I don't do that. As you sugg; /archives//html/Amps/2014-01/msg00137.html (10,886 bytes)
43. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 18 Jan 2014 13:50:17 -0500; ORIGINAL MESSAGE: (may be snipped) Carl KM1H REPLY: I design conservatively. Anyone who thinks that switch is adequate probably rides a motorcycle at full freeway speeds in heave traffic and thinks; /archives//html/Amps/2014-01/msg00138.html (9,939 bytes)
44. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 18 Jan 2014 14:00:04 -0500; ORIGINAL MESSAGE: (may be snipped) n 1/18/2014 9:52 AM, Jim Garland wrote: I agree that one shouldn't leave the unused segments of of a tank coil completely floating, and I don't do that. As you sugg; /archives//html/Amps/2014-01/msg00139.html (11,847 bytes)
45. Re: [Amps] Building an Amp 101 (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Sat, 18 Jan 2014 20:05:52 +0100; Don´t you think it depends on anode voltage and output impedance of the Tube(s)used? The switch is adequate when used in a 1500W amp on low to medium anode voltage. It will certainly arc if you use a; /archives//html/Amps/2014-01/msg00140.html (8,953 bytes)
46. Re: [Amps] Building an Amp 101 (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 18 Jan 2014 15:16:50 -0500; Jerry, It often seems at though the only builders here are those who turn out works of art. I've seen many well engineered and laid out amps on here, but being a perfectionist, Ive seen none that I'd; /archives//html/Amps/2014-01/msg00141.html (18,604 bytes)
47. Re: [Amps] Building an Amp 101 (score: 1): Author: Bill Turner <dezrat1242@wildblue.net>; Date: Sat, 18 Jan 2014 13:56:12 -0800; ORIGINAL MESSAGE: (may be snipped) REPLY: Yes, I do. Can you tell me the anode voltage under severe SWR mismatch conditions such as a broken antenna wire? Not the DC supply, the peak RF. It is the pe; /archives//html/Amps/2014-01/msg00145.html (9,534 bytes)
48. Re: [Amps] Building an Amp 101 (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Sun, 19 Jan 2014 08:20:13 -0500; I presume this refers to desktop amps. My early ones were, but everything today has to be rack mount. No space, so everything must go vertical. If you are willing to take the time to learn to use the; /archives//html/Amps/2014-01/msg00152.html (13,156 bytes)
49. Re: [Amps] Building an Amp 101 (score: 1): Author: Chris Wilson <chris@chriswilson.tv>; Date: Sun, 19 Jan 2014 13:48:47 +0000; I think if you like the retro look building a vintage style amplifier, outward appearance wise, can yield good results on a budget. Trying to create something to rival a current mainstream "black box; /archives//html/Amps/2014-01/msg00153.html (10,480 bytes)
50. Re: [Amps] Building an Amp 101 (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sun, 19 Jan 2014 07:32:06 -0700; Relays are certainly a possibility, Al, but for a nine band amplifier things get a bit complicated. My latest project ( 90% completed) is a duo band 80m/160m amplifier with a pi L tank circuit, and f; /archives//html/Amps/2014-01/msg00154.html (10,242 bytes)
51. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 19 Jan 2014 09:49:43 -0500; You can even buy sheet metal from Ameritron and any other part they use. For something different there are the SB-220 family cabinets which often show as well as the various rack panel width Hallicra; /archives//html/Amps/2014-01/msg00155.html (11,693 bytes)
52. Re: [Amps] Building an Amp 101 (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Sun, 19 Jan 2014 10:43:02 -0500; To make it clear, I've never tried this so I'm not speaking from personal experience. But it seems logical to me that if a vacuum relay is required for the voltages and duty involved, then a bandswit; /archives//html/Amps/2014-01/msg00156.html (10,995 bytes)
53. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 19 Jan 2014 11:05:30 -0500; There is no logic in using vacuum relays in place of a bandswitch in a ham amp at 2500-3200V or so. The senior Ameritrons certainly dont have a blown bandswitch reputation even at 3200V. If an amp ar; /archives//html/Amps/2014-01/msg00157.html (12,975 bytes)
54. Re: [Amps] Building an Amp 101 (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 19 Jan 2014 17:07:26 +0100; After doing some simple calculations, I think you only need 6 positions on the tank switch. 160, 80, 40, 30/20, 17/15, 12/10. The Acom 1500 uses 7 positions as 160, 80, 40/30, 20, 17/15, 12/10, 6. Bu; /archives//html/Amps/2014-01/msg00158.html (8,967 bytes)
55. Re: [Amps] Building an Amp 101 (score: 1): Author: Vic Rosenthal K2VCO <k2vco.vic@gmail.com>; Date: Sun, 19 Jan 2014 08:43:52 -0800; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2014-01/msg00159.html (7,864 bytes)
56. Re: [Amps] Building an Amp 101 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 19 Jan 2014 16:46:41 +0000; Instead of all those relays why not a roller inductor and motor. But still complicated 73 Bill wa4lav ________________________________________ From: Amps [amps-bounces@contesting.com] on behalf of MU; /archives//html/Amps/2014-01/msg00160.html (10,760 bytes)
57. Re: [Amps] Building an Amp 101 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 19 Jan 2014 17:05:07 +0000; Most relays are not constructed of materials suitable for RF. Plastic rather than ceramic is an example. They use a leaf spring material that can handle current just fine at 60HZ or DC but it has a h; /archives//html/Amps/2014-01/msg00161.html (12,501 bytes)
58. Re: [Amps] Building an Amp 101 (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Sun, 19 Jan 2014 12:54:19 -0500; After doing some simple calculations, I think you only need 6 positions on the tank switch. 160, 80, 40, 30/20, 17/15, 12/10. That is exactly the way my amp is built. I'm sure there will be comments; /archives//html/Amps/2014-01/msg00162.html (8,424 bytes)
59. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 19 Jan 2014 13:21:26 -0500; Vic, it seems like half the time your messages have no content. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis; /archives//html/Amps/2014-01/msg00163.html (9,001 bytes)
60. Re: [Amps] Building an Amp 101 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 19 Jan 2014 13:25:07 -0500; Roller inductors usually start arcing in ham use where they are usually fixed tuned for long periods in other service. The flat bar stock rollers with contacts on 2 sides are better than wire and rou; /archives//html/Amps/2014-01/msg00164.html (12,096 bytes)

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