On 6/16/2021 2:39 PM, Dan Maguire wrote:
I never found an actual datasheet for Amidon type 31. A link to a
page showing the u'/u'' plots, not just physical dimensions, would be
much appreciated. Amidon has not responded to email requests.
Amidon is not a manufacturer, they are a distributor/reseller, and
they've been selling stuff at VERY high markups (like $15 for a part
that costs them less than $3) for years, having invented part numbers
like 240-xx. The manufacturer of the parts identified with Fair-Rite mix
numbers is Fair-Rite, an old line US company. Many manufacturers make
mixes similar to their #43 and their #61. The chemical recipes for some
of these materials is a closely guarded secret. The properties of #31 is
quite special compared to other MnZn materials.
Many years ago there was a ham named Amidon. Long SK. Fair-Rite was
owned by a husband and wife team, and I met them in 2004-5 at an IEEE
EMC conference where I was presenting a paper. She was the EE, he was
the ChemE. They retired a few years later, but last I heard, the company
is still owned by the family. Don't know if they're still alive.
73, Jim K9YC
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