TT Omni VI Opt. 3 factory-installed 500 Hz filter in 6.3 MHz I-F only Works well, except the clock. Purchased used from Ten-Tec in 2008. Includes manual and power-supply cable, packed in TT shipping box and material, plus an outer box. Asking $450 + shipping from central PA. Check or USPS MO. Will be ship when cleared. 73, Bill K3QP