Copper Band in a Cross-Over Choke??
David Hafler put copper bands on most of his solid state amp transformers. HK did it for some of theirs. Apparently (offered without factual reference) it is a combination shield and hum - audible - damper. It is called a "flux damper", and may be grounded to the secondary, or not.
Hope that helps.
Peter Wieck
Melrose Park, PA
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