748 gallons of ( looks like mineral oil ) for sale.....
NO RETURNS ACCEPTED !!!
Don WA4NPL
Quoting Carl <km1h@jeremy.mv.com>:
> 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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