I notice in Photo 8 at the location referenced below, that the chimneys only
come up to the bottom of the cooling structure. I too am building a pair of
Gi7-b(t)'s for 6 meters. I built chimneys that come all the way to the top
of the cooling structure. Any thoughts on the difference in performance of
the two cooling structures?
73,
Mike, W5UC
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Tony King - W4ZT
Sent: Tuesday, September 05, 2006 7:10 AM
To: amps@contesting.com
Subject: Re: [Amps] Cooling for GI-7B triodes.
W4EMF, K4POZ and others frequently put an air box around the tubes to
insure the air flows fully around the tubes and exits above the coolers.
I have more pictures of them at <http://gi7b.gs35b.com>.
73, Tony W4ZT
Steve Thompson wrote:
>
> robert briggs wrote:
>> I am currently constructing another linear amplifier this time using a
>> pair of GI-7B(T) triodes.
>> Perusing various projects using these tubes I note that most builders
>> use an ordinary standard computer fan for a pair of tubes.One of the
>> articles states that these tubes run cooler than the old 572B triodes.I
>> take it that the anode coolers are able to shed heat more efficiently.
>> My intention is to mount the tubes in the horizontal plane.Instead of
>> using a typical 240 volt computer fan I am considering using a pair of
>> 12 volt fans from old switch mode supplies, placing each blower directly
>> beneath each anode so that each tube has a good blast of air instead of
>> sharing the flow from one blower.
> I think cooling is most effective if air flows along rather than across
> the fins although transverse cooling seems to work fine in this amp:
> http://www.nd2x.net/w4emf-MLA.html although there's a note at the end
> about an air deflector.
>
> Steve
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