Hi, I have an 8 pole crystal filter, from Corsair II - believe it's 2.4 khz optional filter... # on top of one crystal 48074 # on top of another 8722 # on bottom of circuit board, middle 6840 no longer have rig - not sure of IF, is it 6.3 mhz? anyway, $20 shipped US Priority Dave Heintzleman nd0cw 228 Akin St Newburg, ND 58762 nd0cw at srt.com