Anyone have a manual for the Heath HD-1418 audio filter they'd be willing to part with? 73, Mark WB8JKR Support Amateur Radio, have a Ham for dinner Member ARRL, QCWA, OTC, Society of Cable Telecommunication Engineers WAS, WAC, WTO, DXCC MIXED, DXCC PHONE, GJDXCC, VUCC 2M, 1st place Ohio single op 1988 ARRL SweepStakes Novice 3/71, General 8/72, Advanced 8/78, Extra 8/89