I'm looking for a Heath 3.75 or 5.0 Khz AM filter for a SB-301, I could trade both a SB series SSB filter and a CW filter for it, or cash, or ???? Thanks, 73, Mark WB8JKR Novice 3/71, General 8/72, Advanced 6/80, Extra 8/88 Member Society of Cable Telecommunication Engineers Member ARRL, QCWA, WAC, WAS, DXCC, VUCC 2 meters, GJDXCC, OTC, RCC