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61. [Amps] Which 3-500Z (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 28 Aug 2002 10:20:35 -0700; When I had a 2KD5 many years ago, even its filament voltage was too high with the normal 240V operating primary tap. What were they thinking? (It was probably just about right for operating in VK wit; /archives//html/Amps/2002-08/msg00305.html (10,238 bytes)
62. [Amps] hENRY 2K-3 FAN NOISE (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 28 Aug 2002 14:30:16 -0700; You can acoustically isolate the case using cork or rubber washers/gaskets between the chassis and the cover. It might help. But most of my Henry amps just plain had very loud blowers, and 220V ones; /archives//html/Amps/2002-08/msg00308.html (8,666 bytes)
63. [Amps] Which 3-500Z (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 28 Aug 2002 14:38:22 -0700; Yep, Phil. I like the multi-tap transformers used by Ameritron. Allows great flexibility, although the optimum balance of filament voltage (critical) and high voltage (not critical, but the more, the; /archives//html/Amps/2002-08/msg00311.html (8,446 bytes)
64. [Amps] Which 3-500Z (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 28 Aug 2002 15:01:08 -0700; [Steve Katz] I had heard that, also (somewhere); however, my 2KD-5, purchased new via mail order from Henry back in about 1979 or so, had no indications of offshore assembly and had HENRY RADIO LOS; /archives//html/Amps/2002-08/msg00313.html (7,578 bytes)
65. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 16 Jul 2002 10:54:29 -0700; Golly, how much bias voltage do you need? When using zener devices for such an application, I always use 50W stud-mount devices rated for several amperes of zener current. Never had one fail, yet. Fo; /archives//html/Amps/2002-07/msg00220.html (10,097 bytes)
66. FW: [Amps] KW Linear for FT-817 (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 17 Jul 2002 07:26:32 -0700; /archives//html/Amps/2002-07/msg00246.html (9,480 bytes)
67. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 17 Jul 2002 10:04:25 -0700; Yes, actually, it does! Also correct! Another point to ponder is that Zener devices have a TCZV which makes them drift quite a lot. That applies to "zeners" having a Vz of <5.6V. Devices having a Vz; /archives//html/Amps/2002-07/msg00262.html (9,872 bytes)
68. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 17 Jul 2002 15:54:09 -0700; [Steve Katz] Hi Rich. Case temp of a DO-5 stud, which I usually use, is about the same as the temperature of whatever it's mounted to...for an axial leaded package, I'd think it would be higher! -WB; /archives//html/Amps/2002-07/msg00269.html (9,661 bytes)
69. [Amps] Nice big Plate transformer fs (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 17 Jul 2002 15:59:15 -0700; Still, 4620kv @ 750mA is nothing to sneeze at. Isn't that 3-1/2 million VA? -WB2WIK/6 "If everything seems under control, you're just not going fast enough." - Mario Andretti; /archives//html/Amps/2002-07/msg00270.html (8,780 bytes)
70. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 18 Jul 2002 07:02:40 -0700; ??? Not sure what you mean, here. The DO-5 zener devices I use are normally rated 50W at 55 degrees (C) Tc. Readily available from many sources for a few dollars. The advantage is their high peak cu; /archives//html/Amps/2002-07/msg00286.html (9,341 bytes)
71. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 18 Jul 2002 07:13:28 -0700; Sure. TCZ = temperature coefficient of Zener voltage. TCBV = temperature coefficient of breakdown voltage. -WB2WIK/6; /archives//html/Amps/2002-07/msg00287.html (10,495 bytes)
72. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 18 Jul 2002 07:19:35 -0700; I haven't gone through my backlog of e-mails entirely yet, but people seem to be calling small, axial-leaded diode products "DO-5" for some reason. They're not. DO-5 is a 1/4" stud-mount diode outlin; /archives//html/Amps/2002-07/msg00288.html (10,508 bytes)
73. FW: [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 18 Jul 2002 14:09:46 -0700; /archives//html/Amps/2002-07/msg00294.html (10,504 bytes)
74. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 18 Jul 2002 14:12:54 -0700; I should add to my previous comment re DO-5 and outline drawings... A 5W "air cooled" diode usually isn't really air cooled. It's cooled by its leads, in most cases; thus, the Rthj-a is not the formu; /archives//html/Amps/2002-07/msg00295.html (11,141 bytes)
75. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 18 Jul 2002 15:48:19 -0700; /archives//html/Amps/2002-07/msg00297.html (12,873 bytes)
76. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 19 Jul 2002 07:02:23 -0700; /archives//html/Amps/2002-07/msg00314.html (9,369 bytes)
77. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 19 Jul 2002 07:12:49 -0700; /archives//html/Amps/2002-07/msg00315.html (10,202 bytes)
78. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 19 Jul 2002 07:16:37 -0700; /archives//html/Amps/2002-07/msg00316.html (9,426 bytes)
79. [Amps] Ameritron (Poor Tech service) (http://lists.contesting.com/_amps/2002-Ju (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 19 Jul 2002 07:23:21 -0700; /archives//html/Amps/2002-07/msg00317.html (8,448 bytes)
80. [Amps] Diode Bias Strings (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 19 Jul 2002 08:16:31 -0700; /archives//html/Amps/2002-07/msg00321.html (8,977 bytes)

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