[Hallicrafters] SX-110 crystal filter

[John Brooks]

When using the crystal filter, in either position but
especially in the sharp position, I hear a sort of
ringing or edge-of-feedback type of sound surrounding
voices.  Almost like a microphonic sound, but it does
it even when the speaker is not sitting on the
cabinet.  Is this normal or defect?  Causes and
solutions??

Thanks,
John

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