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Re: [Amps] Centurion cooling improvement ideas for AM service

To: Jason Buchanan <jsb@digistar.com>
Subject: Re: [Amps] Centurion cooling improvement ideas for AM service
From: R.Measures <r@somis.org>
Date: Thu, 26 Aug 2004 06:02:37 -0700
List-post: <mailto:amps@contesting.com>

On Aug 26, 2004, at 4:20 AM, Jason Buchanan wrote:


R.Measures wrote:

Ian -- Agreed, however, the solution is: do not have the dull-gray anode stem chrome-plated on the 3-500Z.


Is there any benefit to using heat dissipators with larger/taller/wider/more fins?

For vertical airflow, wider is better since only the bottom fin gets much air. With vertical air flow, one wide and thick horizontal fin would be optimal With horizontal airflow and horizontal fins, the total surface area of the fins is the bottom-line. .


I've seen ads for anode coolers that were an inch tall... similar to those in QROtec amps... http://www.hamradiomarket.com/Articles/QRO-Images/60.JPG

RE: the photo: Horizontal fins with horizontal cooling makes good sense, however, to adequately cool a 3-500Z with one fan, the fan must be larger than at least 150mm -- which the fan in the photo obviously is not. (the Heath SB-220 uses a 150mm fan). The nearest size DC-brushless fan that is adequate for cooling 3-500Zs is 172mm. Papst makes one which sells for c. $50. 2-tubes cost $298. However, if a split chassis is not utilized, the fan shown in the photo can be used to cool things above the chassis, and a 50mm fan can be used below the chassis to cool the filament pins, provided that pin #s 1 and 5 face each other on the adjacent tube sockets. .

The Centurion has anode caps that are two fins instead of 5....



73 Jason N1SU



Richard L. Measures, AG6K, 805.386.3734. www.somis.org

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