I have one Tentec model 216 (500hz RTTY 9 MHz I-F ) and one model 288 (1.8 kHz, 8 pole SSB 6.3 MHz I-F) filters for sale - $65.00 each delivered anywhere in continental US. These were from my OMNI VI+. Please respond off list to lejeuned at centurytel.net Dave K5WNV