On 6/16/21 8:33 AM, jim.thom jim.thom@telus.net wrote:
On a side note, N3RR, Bill Hider, a few yrs ago, bought 700 (seven
hundred) of the type 31, 2.4 inch OD cores...from I think, Fair
rite..... and the tolerance between all of em was strewn all over the
map, like + or - 20+ %. Bill came up with a simple 1 turn test to
evaluate,and then grade them into various groups. Some time in the past,
apparently Fair rite moved their production facilities to CHINA, and
after that, the +/- tolerances went all to hell.
20% tolerance has been standard on magnetics for decades. And fairly
large temperature coefficients too, like any magnetic material.
I don't know that their Chinese facility (2013) actually had much effect
on their quality and consistency.
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