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1. [Amps] Meaning of "conduction cooled" (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 03 Nov 2005 07:32:43 -0800; I notice that some posters are using the term "conduction cooled" lately and I'm curious what they mean by it. Aren't all amplifiers "conduction cooled" one way or another? Heat is conducted away by; /archives//html/Amps/2005-11/msg00045.html (7,444 bytes)
2. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: Steve Katz <stevek@jmr.com>; Date: Thu, 3 Nov 2005 07:39:14 -0800; Conduction cooled means via heatsink without liquid or air pressure required. There are many (metal/ceramic) tubes specifically designed for conduction cooling and having built-in electrical isolatio; /archives//html/Amps/2005-11/msg00046.html (8,026 bytes)
3. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 3 Nov 2005 10:49:16 -0500; The term conduction cooled refers to a series of metal ceramic tubes that were cooled by contact with a metal heat sink though a BeO ceramic block in a manner analogous to the way solid state devices; /archives//html/Amps/2005-11/msg00047.html (8,538 bytes)
4. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 03 Nov 2005 11:06:15 -0500; The 4CX250 had a version which was conduction cooled. Matter of fact, there was a two tuber in the ARRL handbooks back in the 80's. I don't know if it's still in there or not in the new ones. Best, W; /archives//html/Amps/2005-11/msg00048.html (9,947 bytes)
5. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: "Floyd Sense" <fsense@charter.net>; Date: Thu, 3 Nov 2005 11:07:54 -0500; Most amps today use convection cooling. To me, radiation cooling would imply no airflow used and that isn't seen very often. 73, K8AC _______________________________________________ Amps mailing list; /archives//html/Amps/2005-11/msg00049.html (10,220 bytes)
6. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Thu, 03 Nov 2005 08:45:31 -0800; I would say that external anode tubes like the 3Cx800, etc. are convection (or more precisely, forced-air) cooled, while glass-envelope internal anode tubes like the 3-500Z are primarily radiation co; /archives//html/Amps/2005-11/msg00050.html (7,813 bytes)
7. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 03 Nov 2005 17:12:05 +0000; But doesn't convection (and forced air) start with conduction between the hot surface and the air - so they're all conduction cooled? I'd say a 'conduction cooled' tube displaces the heat through a s; /archives//html/Amps/2005-11/msg00051.html (8,541 bytes)
8. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 3 Nov 2005 12:25:59 -0500; Strictly speaking, glass envelope tubes are cooled by a combination of radiation and convection with only a very slight amount of conduction cooling. The cooling of anode is by radiation and the enve; /archives//html/Amps/2005-11/msg00052.html (9,231 bytes)
9. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 03 Nov 2005 13:26:19 -0500; If a tube is convection, conduction, radiation, liquid or vapor phase cooled has to do with how heat ,produced by the kinetic energy from colliding electrons, is removed from the anode. From there it; /archives//html/Amps/2005-11/msg00053.html (8,404 bytes)
10. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Thu, 03 Nov 2005 19:26:53 +0000; There are 3 ways for something to cool - conduction, convection and radiation. See for example http://www.mansfieldct.org/schools/mms/staff/hand/convcondrad.htm Radiation (electromagnetic) is unique; /archives//html/Amps/2005-11/msg00054.html (10,240 bytes)
11. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 3 Nov 2005 19:25:54 +0000; Not in the normal usage of those terms... but it also depends on whom you ask. A fluid dynamicist would describe any kind of heat transfer by a moving fluid as "convection". An engineer would divide; /archives//html/Amps/2005-11/msg00055.html (10,345 bytes)
12. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 03 Nov 2005 14:22:00 -0500; Bill, One thing about conduction cooled tubes to me is that there is a hot spot at 180 degrees from where it mounts to the heatsink. A convection cooled tube with heat fins has cool air passing over; /archives//html/Amps/2005-11/msg00056.html (9,898 bytes)
13. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Thu, 03 Nov 2005 20:49:20 +0000; I had a few email exchanges with Reid at Eimac about CC tubes. Apparently they do run a lot warmer (typically) and so their life is shorter than air-cooled tubes. The manufacturing cost is higher - m; /archives//html/Amps/2005-11/msg00057.html (11,623 bytes)
14. Re: [Amps] Meaning of "conduction cooled" (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Fri, 04 Nov 2005 08:40:42 -0800; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Thanks, Ian. I think my original question has been answered. I was thinking of a typical heat sink as a heat transfer device rather than a cooling de; /archives//html/Amps/2005-11/msg00058.html (9,619 bytes)

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