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61. Re: [Amps] adding second tube to AL1200 (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Thu, 18 May 2006 00:17:45 -0400; Thanks Rich! That point is valid for adding a second tube to almost any amp whether it is home brew or commercial. Adding a second tube is never as simple as it sounds. As pointed out by others, most; /archives//html/Amps/2006-05/msg00224.html (10,546 bytes)
62. Re: [Amps] GLA1000-GI7B conversion question (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Tue, 23 May 2006 15:00:58 -0400; John, You will need to add a small transformer. Take a look at these pictures on my web page of that same conversion done by W4EMF: <http://w4emf.gs35b.com/GLA-1000-retro-GI7/> 73, Tony W4ZT ________; /archives//html/Amps/2006-05/msg00291.html (7,364 bytes)
63. Re: [Amps] multi-tube amplifiers (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 26 May 2006 13:35:34 -0400; <snip> There are only two justifications for the multi-tube build: 1) You already have all the components and just want to use them. 2) It's something you just want and have to do. Beyond that, the g; /archives//html/Amps/2006-05/msg00389.html (8,884 bytes)
64. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Sat, 27 May 2006 09:03:12 -0400; There have been several references to simply reducing the microphone gain to reduce power. Though this does work, if there is any audio system noise at all, just turning the microphone gain down will; /archives//html/Amps/2006-05/msg00413.html (9,353 bytes)
65. Re: [Amps] GI7B amp (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Tue, 30 May 2006 12:20:21 -0400; Larry, Look at <http://w4emf.gs35b.com> and <http://k4poz.w4zt.com> for some good ideas as well as Google GI-7B and you'll find lots of info. 73, Tony W4ZT ___________________________________________; /archives//html/Amps/2006-05/msg00509.html (6,964 bytes)
66. Re: [Amps] LK500 various (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Tue, 30 May 2006 13:50:39 -0400; I think that arguing about the National Electrical Code doesn't accomplish a lot. Understanding how the circuits work does. Encouraging anyone to make modifications to their house wiring that will li; /archives//html/Amps/2006-05/msg00513.html (12,620 bytes)
67. Re: [Amps] LK500 various (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Tue, 30 May 2006 14:25:06 -0400; Only if she's pretty! Couldn't resist that one either! ;~) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-05/msg00515.html (7,849 bytes)
68. Re: [Amps] Replace 2x 4-400 with 2x 3-500ZG (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 02 Jun 2006 08:01:14 -0400; With the increased gain and the plate voltage at 3KV+, you may have to provide some bias to keep the idling current low enough with no drive. 73, Tony W4ZT ___________________________________________; /archives//html/Amps/2006-06/msg00037.html (9,445 bytes)
69. Re: [Amps] GS35b burn in? (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 02 Jun 2006 08:42:35 -0400; Hi Andy and group, I like to heat them for at least an hour before putting any voltage on the anode since they're old. I prefer several hours. I have tested them after a nominal ten minute warm up an; /archives//html/Amps/2006-06/msg00040.html (7,410 bytes)
70. Re: [Amps] emtron dx-1??? for a couple hundred bucks? (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Mon, 05 Jun 2006 15:40:17 -0400; Better still, look at its location! 73, Tony W4ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00138.html (9,345 bytes)
71. Re: [Amps] Gi-7b (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Mon, 26 Jun 2006 22:21:56 -0400; Mike, Take a look at the projects by W4EMF <http://w4emf.gs35b.com> and K4POZ, <http://k4poz.w4zt.com>. Treat the GI-7B like any other old tube. It's a very stable little tube that will give you 55 t; /archives//html/Amps/2006-06/msg00485.html (7,991 bytes)
72. [Amps] Henry 8k and 8k ultra wattmeter schematic (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 30 Jun 2006 12:47:09 -0400; I am looking for the schematics for the Henry 8K and 8K Ultra wattmeters. If anyone has these or could help me locate them I would appreciate it. Thanks and 73, Tony W4ZT ____________________________; /archives//html/Amps/2006-06/msg00668.html (6,351 bytes)
73. [Amps] Henry 8k and 8k ultra wattmeter schematic (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 30 Jun 2006 17:31:05 -0400; I am looking for the schematics for the Henry 8K and 8K Ultra wattmeters. If anyone has these or could help me locate them I would appreciate it. Thanks and 73, Tony W4ZT ____________________________; /archives//html/Amps/2006-06/msg00673.html (6,962 bytes)
74. Re: [Amps] GS35B Amp 15 m Situation (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Sun, 02 Jul 2006 23:55:14 -0400; Mike, Have you monitored the drive signal at the same time? Does the drive signal come up immediately? Are you using a dynamic bias circuit? How do you switch your bias? Are you using a tuned input c; /archives//html/Amps/2006-07/msg00066.html (8,465 bytes)
75. Re: [Amps] Safety grounding - was Mains Isolation Transformer (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Tue, 04 Jul 2006 10:12:01 -0400; <snip>... Lou, that wouldn't necessarily be true. If you had a 240 Volt device that didn't have any 120 Volt needs at all, you would still HAVE to use that plug to get the power from the generator. I; /archives//html/Amps/2006-07/msg00184.html (9,719 bytes)
76. Re: [Amps] GS35 144MHz amp faileur, how should we test (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Wed, 05 Jul 2006 09:55:38 -0400; Robert, What is the idling current with no drive (ZSAC)? Do you have a method to vary the bias? I assume that you have some protection circuit active. Do you know which one is tripping? Grid or Anode; /archives//html/Amps/2006-07/msg00216.html (8,131 bytes)
77. Re: [Amps] High frequency heater supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Thu, 13 Jul 2006 13:40:16 -0400; Steve, We have experienced problems with indirectly heated cathodes which are INTERNALLY connected to the filament like the GS-35B and the GI-7B such that the output was modulated with hum from the f; /archives//html/Amps/2006-07/msg00374.html (8,686 bytes)
78. Re: [Amps] Switching Power Supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 14 Jul 2006 14:56:43 -0400; Tom, The reason I chose a small switcher for my filament supply was to provide a stable DC filament voltage over changing input line voltages. The switcher I found was a fully shielded commercial var; /archives//html/Amps/2006-07/msg00388.html (9,367 bytes)
79. Re: [Amps] Switching Power Supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 14 Jul 2006 15:36:40 -0400; I think this was meant for Steve ;) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00392.html (10,944 bytes)
80. Re: [Amps] Switching Power Supplies (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Sat, 15 Jul 2006 01:15:14 -0400; I agree with everything you've said here Tom but that doesn't dissuade me from using the switcher on my indirectly heated filament on the Russian GS-35B triodes. As you stated before, price can be a; /archives//html/Amps/2006-07/msg00410.html (11,468 bytes)

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