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Re: [TCML] phillips question about wax and more
That's one reason very old transformers are more likely to fail. The
shrinking asphalt can leave voids or damage the fragile secondary windings. If your
transformer with the different smell had an internal short, it might add a
burned smell to the asphalt, or it may smell different because a lot of the
volatile compounds may have evaporated or dried out.
Interesting. The last transformer I depotted was built in 1982 which
would explain the cracks in the potting material, and why it was so
stubborn about coming out. I'm still not sure why the old transformer
had a completely different smell than the newer one.
On Mon, Jun 9, 2008 at 10:15 AM, <Sfxneon@xxxxxxx> wrote:
> Tar is never used. The black stuff in NSTs is actually a mixture of asphalt
> and silica flower, which makes it a stiffer consistency. Once it's potted,
> they don't want it to liquefy too easily and run out of the case. Also, it
> slowly dries out with age and becomes harder to remelt.
> Tony G
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