Back in the dark ages when I was a kid (40+ years ago), my dad built a Heathkit Cantenna and instead of using transformer oil, he substituted plain old mineral oil. It was cheaper and didn't contain those dreaded PCBs.

Every so often I replace what has leaked out over the years and it is still working.

On Tue, Oct 10, 2023 at 4:00 PM Mark Foltarz via Milsurplus <milsurplus@mailman.qth.net> wrote:

I am cleaning up a Bird Termaline 8890 in preparation for working on my GPT 10K and I realize it most likely needs some oil.
I reach out to Bird and ask for a modern equivalent to the part # indicated in the manual
They cheerfully send me to a link ( Bird RPK8890-3, Coolant Kit | Bird RF Online Store (btgstore.com) ) for the oil.
The kit only costs $1300 for 3 gallons of oil - and a gasket.
I couldn't believe it.
Anyone have any advice about a lower cost replacement for the oil ?
I was thinking of using the MFJ transformer oil for loads.

tnx
de WA4AM
Mark

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