Sounds like a job for good old PCB transformer oil maybe???
Carl
KM1H
----- Original Message -----
From: <TexasRF@aol.com>
To: <larry@w7iuv.com>; <amps@contesting.com>
Sent: Monday, April 05, 2010 12:15 PM
Subject: Re: [Amps] liquid cooling
> Larry, I wonder why your aversion to using water?
>
> 73,
> Gerald K5GW
>
>
>
> In a message dated 4/5/2010 11:07:23 A.M. Central Daylight Time,
> larry@w7iuv.com writes:
>
> The recent discussion on water cooling amp tubes got me thinking. Again.
> (not a good thing)
>
> Basically I would like to play with liquid cooling but I can't/won't use
> water. While I was still working, I worked on a multi-kilowatt amplifier
> that was oil cooled. It went into the avionics bay of an aircraft where
> all the rest of the equipment was also oil cooled.
>
> As I recall, the oil looked and felt like mineral oil, but I'm sure the
> military wouldn't use something that common and cheap and low flash
> point. At the time, I pulled up the MSDS for the oil but no longer have
> it and of course I can't remember the numbers.
>
> K8CU talks about using ATF for cooling liquid here:
>
> http://www.realhamradio.com/liquid-cooling.htm
>
> Unfortunately, there is no indication in the article that he or anyone
> else actually used ATF. Now ATF contains sulphur compounds that eat
> silver plating and cannot normally be used in things like dummy loads
> because of this property. However, a set of heat exchangers used for
> tube cooling would not have that problem.
>
> K8CU also mentions mineral oil and says it is not suitable due to the
> low flash point. I have to wonder about that because for one I would
> hope nothing in a system I would build would ever get hot enough to
> worry about flash point and two, it probably won't flash anyway due it
> being in a closed system with little or no free air/oxygen.
>
> What I'm looking for is someone who has actually done liquid cooling
> with something other than water. No, I have no interest in "flat earth"
> theories, or what you think you remember from a thermodynamics class you
> sat through 40 years ago. I want actual test results and operational
> data from real world applications.
>
> 73, Larry
>
> Larry - W7IUV
> DN07dg - central WA
> http://w7iuv.com
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