I have for sale an Icom FL223 1.9khz SSB filter which fits many Icoms including the 706/736/737/738/746/756/761/765/775/781 series of radios. Very easy installation, just drops in the socket. It makes a big different on receive for SSB under crowded conditions. I am asking $70 shipped for it and can take paypal/check/MO. 73 John AF5CC