Another degaussing coil, this one from a large TV.
21 inch diameter, kinks minimized.
AADE measures 9.11mH.
One of those "universal" kits that measures almost anything reads
16.8 ohms, 2.55mH.
Using a 0.1uF cap in parallel and driving that with square wave and
10K in series, rings at 9.5KC for 2.8mH