Carl wrote:
> And then there were those who immersed metal 6L6's and 1614's upside
> down in a bucket of water and ran them at 100W out.
That was 100 each too. It takes me 6 of them to get 200 watts music
power out.
The infamous 6AG7 kilowatt<:-))
73
Roger (K8RI)
>
> Carl
> KM1H
>
>
>
>
> ----- Original Message ----- From: "Roger" <sub1@rogerhalstead.com>
> To: "Carl" <km1h@jeremy.mv.com>
> Cc: <TexasRF@aol.com>; <larry@w7iuv.com>; <amps@contesting.com>
> Sent: Monday, April 05, 2010 3:26 PM
> Subject: Re: [Amps] liquid cooling
>
>
>>
>>
>> Carl wrote:
>>> Sounds like a job for good old PCB transformer oil maybe???
>>>
>>
>> Actually good old Dow Corning 200 fluid.
>> There are no normal cooling fluids that have a greater thermal
>> conductivity than water.
>> I worked on a project with an engineer many decades ago trying to
>> come up with a substitute fluid for a solar heating system that could
>> be used in northern climates and not freeze at night. We had some
>> pretty good stuff (basically 200 fluid of different viscosities), but
>> it was expensive.
>>
>> As to those talking about tubes submerged in oil such as the
>> rectifiers in X-ray machines, that is primarily for insulation
>>
>> 73
>>
>> Roger (K8RI)
>>> 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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>
>
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