Hi I am looking for an MFJ 726 audio filter if anyone has an extra they would like to sell, respond direct to mhartwe at gmail.com. Ideally I would like to find a Ten Tec model 245 CW filter for my 540 rig. I expect those are rare right now. I have had some emails from others who have wired in the MFJ filter though. -- Marty Hartwell