I have for sale a Kenwood YK-88SN-1 1.8khz SSB filter which will fit in a variety of Kenwood models, including the TS450/570/690/850/950. I am asking $70 plus shipping for it. They sell new for $130. 73s John AA5JG (ex: W5TD, NE0P) 6M WAS #1275, 6m VUCC #1260 2m VUCC #615, Satellite VUCC #129