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1. [Amps] SB220 cooling was: Re: Coupling a blower to an air system socket (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Mon, 18 Mar 2013 06:29:25 -0400; For what it may be worth, I seem to have cured a recurrent problem with overheated filament pins on my SB-220 (which came unsoldered frequently) by putting a muffin fan directly over the tubes, sucki; /archives//html/Amps/2013-03/msg00241.html (10,670 bytes)
2. Re: [Amps] SB220 cooling was: Re: Coupling a blower to an air system socket (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Mon, 18 Mar 2013 04:02:16 -0700; REPLY: 3-500's are notorious for this problem. Someone posted years ago that Amperex brand 3-500's have welded filament pins instead of soldered, which would seem like a good way to go. I have not ve; /archives//html/Amps/2013-03/msg00242.html (10,022 bytes)
3. Re: [Amps] SB220 cooling was: Re: Coupling a blower to an air system socket (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 18 Mar 2013 13:36:19 -0400; Many have reported that the Harbach fan cools less than the original and leaves hot spots on the tube. The Heath fan has to be cleaned and lubricated to stay at speed, the blades have to be positione; /archives//html/Amps/2013-03/msg00249.html (12,902 bytes)

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