I have purchased a used K3, serial number 3000 or so, it has been sent back to Elecraft for updates etc and returned to me working great so far. I would like to update some things especially the roofing filters first so the question I would like to ask is Has anybody upgraded from the 2.7 five pole filter to the 2.8 eight pole filter? I understand the 8 pole is a wider filter with 3 more filtering crystals , does it make any difference in received audio? also could I use the fm filter for use in the am position. Any other suggestions would be appreciated. Thanks Mike W8FLT
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