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1. [Amps] Fan for SB220 (score: 1): Author: "JayKay" <pcb4u@verizon.net>; Date: Thu, 16 Dec 2010 19:30:32 -0800; A local ham buddy just got back into the hobby after an 8 year hiatus and got a hold of 2 SB220's. He noticed they run hot and he asked the following question...so I figured there are folks out here; /archives//html/Amps/2010-12/msg00177.html (7,202 bytes)
2. Re: [Amps] Fan for SB220 (score: 1): Author: "JayKay" <pcb4u@verizon.net>; Date: Thu, 16 Dec 2010 19:33:41 -0800; OK it wasn't a "small muffin"....it was a muffin fan HI HI Jay _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2010-12/msg00178.html (7,575 bytes)
3. Re: [Amps] Fan for SB220 (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Fri, 17 Dec 2010 06:47:09 +0000; I'm using one of the Harbach fans on a SB220 - they move a lot more air than the original Heathkit fans. Higher air-flow = higher noise But I can't say I've noticed that it runs hot. Regards David G; /archives//html/Amps/2010-12/msg00179.html (7,585 bytes)
4. Re: [Amps] Fan for SB220 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 17 Dec 2010 09:27:34 -0500; Tests have shown that the turbulance from the high speed Harbach does little for the cooling unless a shroud is added. The one saving grace is a WW resistor can be added to reduce the speed a bit and; /archives//html/Amps/2010-12/msg00184.html (9,049 bytes)
5. Re: [Amps] Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Fri, 17 Dec 2010 09:36:14 -0600; Carl, I'm supprised no one has mentioned adding a black aluminum shield between two 3-500s to help prevent the two tubes from radiating heat ( and rf ) into each other. I've done this on my SB220, bu; /archives//html/Amps/2010-12/msg00186.html (10,175 bytes)
6. Re: [Amps] Fan for SB220 (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Fri, 17 Dec 2010 11:02:33 -0500; Does the shield increase overall heat build-up inside the amp because it is absorbing the heat? I had always thought black was a no-no. I see that you have improved air flow. Maybe that carries it al; /archives//html/Amps/2010-12/msg00187.html (12,795 bytes)
7. Re: [Amps] Fan for SB220 (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Fri, 17 Dec 2010 09:45:11 -0800; ORIGINAL MESSAGE: REPLY: I question whether tubes in parallel can radiate RF into each other. There is a small amount of capacitance from plate to plate, but the voltage at each end of the "capacitor; /archives//html/Amps/2010-12/msg00189.html (8,047 bytes)
8. Re: [Amps] Fan for SB220 (score: 1): Author: "Jim Tonne" <Tonne@Comcast.Net>; Date: Fri, 17 Dec 2010 12:57:01 -0500; Bill: I think Don was mostly wondering about heat. I had a Collins 20V2 broadcast rig that had a pair of 4-400s that "talked to each other" in terms of heat. The two tubes weren't all that far apart; /archives//html/Amps/2010-12/msg00190.html (8,251 bytes)
9. Re: [Amps] Fan for SB220 (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 17 Dec 2010 10:06:45 -0800; Tubes and transistors are like batteries in parallel, sort of. They contain an AC voltage or current generator that multiplies the AC input voltage or current by some number that is a function of the; /archives//html/Amps/2010-12/msg00191.html (9,420 bytes)
10. Re: [Amps] Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Fri, 17 Dec 2010 12:20:33 -0600; Me too, but somewhere in the lower levels of my RAM, I remember something about shielding multiple tubes . ( ?? ) Don W4DNR _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2010-12/msg00192.html (7,865 bytes)
11. Re: [Amps] Fan for SB220 (score: 1): Author: Steve Thompson <g8gsq@f2s.com>; Date: Fri, 17 Dec 2010 21:07:26 +0000; It's not surprising that the sides facing each other should get hotter than the rest - but a metal screen won't help by shielding heat. If it's shiny it just reflects the heat back and if it's black; /archives//html/Amps/2010-12/msg00193.html (8,259 bytes)
12. Re: [Amps] Fan for SB220 (score: 1): Author: Thomas Carlsson <thomascarl@gmail.com>; Date: Fri, 17 Dec 2010 19:58:42 -0200; Sorry, but I feel we are in for a misunderstanding here. I have seen suggestions to paint inside, existing shielding black, to minimize heat reflection and maximize heat absorbation. Have nothing see; /archives//html/Amps/2010-12/msg00194.html (9,861 bytes)
13. Re: [Amps] Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Fri, 17 Dec 2010 18:11:02 -0600; If I ever go into it again, I may add a two layer heat shield to double the surface area the fan can cool. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2010-12/msg00195.html (9,075 bytes)
14. Re: [Amps] Fan for SB220 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 17 Dec 2010 21:33:02 -0500; I dont see how that shield helps anything Don, especially black. Have you done any temperature tests on the tubes and shield? A shroud partially or fully encloses the fan as in automotive use. Carl K; /archives//html/Amps/2010-12/msg00197.html (12,125 bytes)
15. Re: [Amps] Fan for SB220 (score: 1): Author: David G4FTC <g4ftc@hotmail.com>; Date: Sat, 18 Dec 2010 12:30:43 +0000; Hi All, I've been following this thread, and the one thing that everyone seems to have overlooked is that the critical factor in the operation of a tube such as the 3-500Z is to keep the temperature; /archives//html/Amps/2010-12/msg00198.html (8,665 bytes)
16. Re: [Amps] Fan for SB220 (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Sat, 18 Dec 2010 09:12:26 -0800; This may seem to be to at first but let me go on. Years ago the same belief existed regarding black vs. sliver on the cylinders of cast iron Harley -Davison motorcycles. (Yes, I am that old I have se; /archives//html/Amps/2010-12/msg00199.html (13,449 bytes)
17. Re: [Amps] Fan for SB220 (score: 1): Author: "Mike" <noddy1211@sbcglobal.net>; Date: Sat, 18 Dec 2010 09:44:39 -0800; If the equipment has strong forced-air cooling, then heat-sink surface finish isn't very important. If anodized with black oxide coating it will reduce thermal resistance up to 25% if convection cool; /archives//html/Amps/2010-12/msg00200.html (14,164 bytes)
18. Re: [Amps] Fan for SB220 (score: 1): Author: "Rex Lint" <rex@lint.mv.com>; Date: Sat, 18 Dec 2010 13:44:59 -0500; So what's the groups take on Measure's "paint it black"? Debunked or still a valid argument? http://www.somis.org/SB220ci.html -Rex Rex Lint, Consultant 26 Brek Drive Merrimack, NH 03054 牋牋 PH: 603; /archives//html/Amps/2010-12/msg00203.html (15,354 bytes)
19. Re: [Amps] Fan for SB220 (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Sat, 18 Dec 2010 14:21:52 -0500; I think Richard's comments lean more toward reducing the reflection than heat being radiated away from the tubes by changing colors. He is saying that a flat black is the best color to break up the r; /archives//html/Amps/2010-12/msg00205.html (17,338 bytes)
20. Re: [Amps] Fan for SB220 (score: 1): Author: K8MLM@aol.com; Date: Sat, 18 Dec 2010 14:37:59 EST; Paint the inside and outside black. The black inside will absorb the heat more effectively and the black outside will radiate it more effectively. Bob K8MLM In a message dated 12/18/2010 1:45:29 P.M.; /archives//html/Amps/2010-12/msg00206.html (15,478 bytes)

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