FS: Very rare TenTec FR-4 audio filter. This is an outboard, passive audio
filter built in a cabinet resembling the KR-40 keyer (walnut and cream).
Front panel has phone jack, in/out switch and min-max adjustment. On the
back is a cord with a phone plug which plugs into your audio output. This
unit may have been designed for the PowerMite series since it requires no
power.
$25 plus shipping from Louisville, Ky
Steve Ellington
Amateur Radio Operator N4LQ
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