I have a YG-88C from a TS820S and also a KB-1 deluxe vfo knob from a TS830S. The CW filter is used but good condition the KB-1 is effectively NIB though no paperwork if there was any. Would swap the filter for a YK-88C-1 filter, not sure about the KB-1. Can anybody indicate what it might be worth? 73's Martin, HS0ZED