I have 2 Inrad #761 filters and 1 Inrad #750 filter. The 761's are 9 MHz IF filters for the ORION or OMNI VI+ and are 1.8 KHz. The 750 is for the 6 MHz IF on the Omni VI+ and is 400 Hz. All are like new in their original packaging. $75 each plus $3.85 postage 73, Mike W9MWS