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Total 8 documents matching your query.

1. [Amps] Fw: Fan for SB220 (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Sat, 18 Dec 2010 13:20:44 -0500; I have never quite understood the premise of painting the inside of an RF deck ANY color. The black paint part comes from the fact that heat generators that generate heat from the inside will radiate; /archives//html/Amps/2010-12/msg00201.html (15,822 bytes)
2. Re: [Amps] Fw: Fan for SB220 (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 18 Dec 2010 13:33:01 -0500; Just one minor quibble - the first two inches of the top rear portion of my SB-220's RF cage is not open, presumably to make sure that the air from the fan at least starts out in the right direction.; /archives//html/Amps/2010-12/msg00202.html (8,352 bytes)
3. Re: [Amps] Fw: Fan for SB220 (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Sat, 18 Dec 2010 13:54:45 -0500; Not to try to be argumentative but this only proves the bare minimum of cooling that exists under the tube deck. If you doubt this, turn the fan off and see how long the solder lasts in any of the pi; /archives//html/Amps/2010-12/msg00204.html (8,806 bytes)
4. Re: [Amps] Fw: Fan for SB220 (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sat, 18 Dec 2010 15:34:41 -0500; Due to the shrouded fan it probably makes little if any difference. It does. These pins depend on airflow for cooling. If there is a resistive heating problem the cooling becomes even more important.; /archives//html/Amps/2010-12/msg00209.html (11,262 bytes)
5. Re: [Amps] Fw: Fan for SB220 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 18 Dec 2010 16:55:52 -0500; The solid top cover piece and the proper positioning of the fan blade in the baffle certainly does direct the flow. Properly built and knowing how to solder the filament socket wires does wonders for; /archives//html/Amps/2010-12/msg00212.html (18,778 bytes)
6. [Amps] FW: Fan for SB220 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 19 Dec 2010 00:15:10 -0500; Plates in radiation cooled power tubes are either coated with black carbon or made of graphite because black is a better radiator. 73 Bill wa4lav It ends up that the perfect black or any thing that a; /archives//html/Amps/2010-12/msg00228.html (10,383 bytes)
7. Re: [Amps] Fw: Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Sun, 19 Dec 2010 01:14:40 -0600; And remember, small CPU fans weren't available to use as "booster" fans on the filament pins. Now,with a little fabrication, each tube can have it's own filament pin cooler. Don W4DNR _______________; /archives//html/Amps/2010-12/msg00233.html (7,922 bytes)
8. Re: [Amps] FW: Fan for SB220 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 19 Dec 2010 08:20:10 -0500; The thick graphite plates simply provide a large thermal mass that takes longer to warm up and a lot longer to cool down than the thin metal plates. Compare it your self sometime between 3-500Z's of; /archives//html/Amps/2010-12/msg00242.html (12,689 bytes)

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