I have an extra INRAD filter designed for TT rigs. It is the model 757 2.4 khz filter for the 6.3 mhz IF. It can be used with the Corsair I & II, Delta I, and Omni V & VI transceivers. It replaces the stock filters that come in those rigs to provide sharper and smoother response. I will ship it for 65ドル. Thanks. Jim N4AL [email protected]