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101. Re: [Amps] Conductive Grease (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Mon, 26 Nov 2007 10:05:40 -0500; At one time castor oil was used in automobile racing engines rather than petroleum oil. I can still remember the sweetish exhaust smell of an engine running on castor oil. I think that's where Castro; /archives//html/Amps/2007-11/msg00376.html (11,085 bytes)
102. Re: [Amps] Johnson Roller Inductor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Mon, 31 Dec 2007 19:59:09 -0500; My catalog of Johnson inductors lists; 226-1 22.5 uH 3" x 12 3/4" 226-3 13.5 uH 3" x 10 3/4" 226-5 8 uH 3" x 9 1/4" Maybe that helps. David KC2JD/4 _______________________________________________ Amp; /archives//html/Amps/2007-12/msg00300.html (8,441 bytes)
103. Re: [Amps] Tubing needed (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 3 Jan 2008 14:23:02 -0500; Ask for refrigeration tubing. It's dead soft, easily bendable, and should be available at any plumbing supply. A 2ft piece may be another matter. You may have to buy a whole 25 or 50 ft coil. A plumb; /archives//html/Amps/2008-01/msg00033.html (8,491 bytes)
104. Re: [Amps] amp schematic drafting? (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 6 Mar 2008 14:47:11 -0500; Hi, You can do this with Visio Technical. Older versions are usually available on eBay at little cost. David KC2JD/4 _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2008-03/msg00061.html (8,371 bytes)
105. Re: [Amps] Painting xfmrs (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Mon, 5 May 2008 17:44:30 -0400; Aren't most Mil transformers gray? David KC2JD/4 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2008-05/msg00059.html (10,892 bytes)
106. Re: [Amps] Pride DX 300 Amplifier (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Fri, 27 Jun 2008 11:29:34 -0400; The 4CX250R is simply a ruggedized version of the 4CX250B http://www.cpii.com/docs/datasheets/75/4CX250R-7580W.pdf KC2JD/4 _______________________________________________ Amps mailing list Amps@conte; /archives//html/Amps/2008-06/msg00228.html (8,604 bytes)
107. Re: [Amps] Keeping RTVs and Liquid Electrical Tape useable (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Fri, 27 Jun 2008 14:15:07 -0400; I have tried MEK and it didn't seem to work too well. The Liquid Electrical Tape was lumpy. On another attempt I used good old octane and it worked perfectly. The liquid was thinned and smooth. I now; /archives//html/Amps/2008-06/msg00230.html (10,742 bytes)
108. Re: [Amps] High voltage wire (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 25 Dec 2008 09:15:52 -0500; I have always used RG-8 coax, not foam, for HV wire. I use HN series coax connectors. They are a little pricey if you buy them new but I manage to find a sufficient supply by scrounging around in the; /archives//html/Amps/2008-12/msg00326.html (8,678 bytes)
109. Re: [Amps] 5cx1500 Amp (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Fri, 02 Jan 2009 10:22:38 -0500; Without knowing more about it than just the tube used it is difficult to know about documentation. However, in Bill Orr's Handbooks there was a construction article on a 5CX1500 amp. It is in the 21s; /archives//html/Amps/2009-01/msg00009.html (8,363 bytes)
110. Re: [Amps] 5cx1500 Amp (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sat, 03 Jan 2009 19:29:17 -0500; The socket is no more special than that for the 4CX1500. It is basically the same socket, It just has an extra connector for the suppressor grid. David Kc2JD/4 _______________________________________; /archives//html/Amps/2009-01/msg00021.html (10,299 bytes)
111. Re: [Amps] 5cx1500 Amp (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 04 Jan 2009 12:34:51 -0500; I can't tell you about the 5CX1500B but I have a 5CX1500A in a socket sitting on the desk right in front of me. Yes, there is a difference between the 4CX1500A and the 5cx1500A sockets. But, it is on; /archives//html/Amps/2009-01/msg00030.html (11,990 bytes)
112. Re: [Amps] Silver plated braid (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 21 Jan 2009 07:59:48 -0500; All Teflon insulated wire is silver plated. The high temperatures involved in Teflon extrusion would be detrimental to copper even if tin plated. David KC2JD/4 _______________________________________; /archives//html/Amps/2009-01/msg00195.html (8,090 bytes)
113. Re: [Amps] High voltage/wattage zeners (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 08 Feb 2009 14:53:19 -0500; I don't believe anyone is making high wattage zeners any more. Any time I find one at a ham fest I grab it. Is there some specific voltage you need? I have some 50 watt zeners. David KC2JD/4 ________; /archives//html/Amps/2009-02/msg00207.html (9,193 bytes)
114. Re: [Amps] silver mica assortment - where to source? (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 01 Mar 2009 16:59:10 -0500; Jeff, Try Just Radios They have a wide assortment of silver micas and their prices are better than Mouser. I have bought capacitors from them a number of times. Good prices, quick shipping David KC2J; /archives//html/Amps/2009-03/msg00034.html (9,454 bytes)
115. Re: [Amps] Silver plating (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 09 Apr 2009 18:12:02 -0400; The product is call Cool-Amp, $30 for a 2 ounce jar. Electricians use it on buss bars. You take a wet rag, rub it on, and rinse. David KC2JD/4 _______________________________________________ Amps mai; /archives//html/Amps/2009-04/msg00110.html (12,133 bytes)
116. Re: [Amps] HT-33A (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sat, 25 Jul 2009 08:22:37 -0400; The problem with the HT-33A is the tube. PL-172's have a propensity to leak. Since they are no longer being made, a good one is difficult to find and expensive when you do. A good PL-172 is probably; /archives//html/Amps/2009-07/msg00333.html (8,500 bytes)
117. [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Tue, 04 Aug 2009 11:00:02 -0400; I am restoring a SBE-33 transceiver, don't ask why, and the plate bypass capacitor is a 0.1 uF paper capacitor. There is also a 0.1 uF paper capacitor as a cathode bypass on the pair of PL-500's. Is; /archives//html/Amps/2009-08/msg00079.html (7,162 bytes)
118. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 05 Aug 2009 08:24:49 -0400; Manfred, Maybe my nomenclature of plate bypass capacitor is incorrect. It is capacitor connected to the DC feed end of the plate choke. I have never seen a capacitor of that large value used for that; /archives//html/Amps/2009-08/msg00084.html (10,578 bytes)
119. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 05 Aug 2009 16:21:27 -0400; Manfred, Maybe I have left out a piece that is pertinent to this discussion. The SBE-33 does not use a transformer in the HV power supply. It has a voltage quadrupler from line voltage to a nominal 4; /archives//html/Amps/2009-08/msg00088.html (11,845 bytes)
120. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 05 Aug 2009 16:24:47 -0400; Oops, I left out 0.1 in my reply. David _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-08/msg00089.html (11,168 bytes)

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