At work we use oil cooling for a number of situations with high voltage. The
oil gives a great benefit for insulation and allows more compact layouts. I
don't know of any RF amplifiers this way, only pulse amplifiers using planar
triodes and thyratrons.
The tube is basically sitting under the oil. However, I have not worked on any
of these designs, and I believe they still require some mechanical work to
force the oil to carry the heat by the anode. In one system there is a small
recirculating oil pump and
pipes, all immersed. (not the pump motor). The oil is typically a
silicone-based liquid called Envirotemp 200. You can also used Envirotemp FR3.
You can also just use transformer oil, like Shell Diala.
John
K5PRO
> 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.
...
> 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
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