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[AMPS] transformer oil

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Subject: [AMPS] transformer oil
From: (2)
Date: Sun, 30 Sep 2001 17:51:55 -0700
>  I purchased an old military 1000 watt dummy load at a hamfest today.  It 
>is quite large and has industrial size radiators.  I ran 500 watts into it 
>for about 5 minutes.  I noticed that the input area where the "N" 
>connector is fastened got quite warm, whereas the rest of the dummy load 
>didn't seem to get warm at all.  I opened it up and found that the oil is 
>low and would not completely cover up the resistive element and that the 
>oil is rather dirty.  I saw in a radio handbook that transformer oil may 
>be obtained from the local power company, so I will try them as a source.  
>If you know of another source, please let me know who it is.
>  I know nothing about oil and heat transfer, so could someone explain why 
>one could not use motor oil or mineral oil or cooking oil such as olive 
>oil ?  Secondly, should the transformer oil be filled right up to the top 
>of the dummy load or should there be a little room for expansion?

//   I use Mobil-1 five-wt. synthetic oil in my Bird dummy load.  In that 
model, the oil lever should be just up to the filler hole with the load 
in the normal config. 

cheers, Ken

-  R. L. Measures, 805.386.3734, AG6K,  

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