Hi. I am looking for a CW filter as used in the TR-6. I believe it is the same part used in the TR4-Cw. It is centered on 9 MHz. I have the following filter to trade: FL-500 and FL1500 These are used in the R4-C receiver. They are of course 500 Hz and 1500 Hz respectively. I would like to trade both of the above filters for the 9 MHz CW filter. I will pay postage, etc. Thanks in advance! ron N4UE