I have one made by Network Sciences, Inc.:  250Hz at 5695KHz.  It worked in the radio I pulled it from.  $80 shipped to Ohio.

73, George K4GM

Sunday, April 28, 2013 3:08 PM

 
 Guess I should have phrased my post more accurately. I am looking to purchase a used 250hz CW filter for my R4C Drake Receiver.  Thanks for the many replies with references to dealers and filter suppliers.  73  lane de n8aft
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