Audio filter.

[Fred Holnagel]

For sale passive audio C.W. filter FL-8.  You who have been hams more
than 50 years like myself know this WW2 item. No wiring required , the
original plug and play. Plugs into your headphone jack and then your
phone/speaker plugs into it. When there is an interfering CW note, tune
the radio until that note hits 1020 cycles and it flat disappears!
Amazing! About 3"x4"x2"  Black crackle finish.
$15.00 plus shipping. Net wt. 24 oz. Tnx. Fred W7PRV

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