On Jan 3, 12:31*am, "Bryan" wrote:
Bob Campbell wrote:
John Smith wrote:
Dave wrote:

...
http://www.eham.net/forums/Elmers/1574

Uh, yeah, I guess your reference to a dummy load is helpful, in some
other reality ...

I was just happy to see someone in that thread pop up with the warning
about PCBs in old transformer oil. * I couldn't believe someone said they
actually got power company transformer oil!

After I refurbished my Cantenna (needed a new globar resistor and cleaning),
I was able to get a gallon from my local power company (free gratis). *It
took a few phone calls to find the supervisor of the transformer shop. *At
the rate their pump runs, the trick was getting /only/ one gallon!

I considered mineral oil but learned transformer oil has better thermal
characteristics. *I now have a homebrew air-cooled dummy load that will
handle over a kilowatt continuously.

Bryan WA7PRC

I used Shell Diala for years in radar systems. The last time I changed
the oil we used somrthing else, probably cheaper. The main ingredient
in all odf it is mineral oil but it has a few additives. Local PoCO
uses the same. We got some from them one time and they had a RR tank
car full of it.

Jimmie