Hi gang,
  ebay has a Kron-Hite filter, ebay#376944839.  Can't tell what the
specs are.
  I use a Rockland dual tuneable filter with my Lehman -- works great! 
One is avail. at:
http://216.87.163.91/cgi-bin/dinamic/link.cfm?ID=219310&Dealer_ID=43&web_site=http://www.kentronix.com/
  for $250 incl. manual.
Bob
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