Not that I know of. Also, the serial numbers were "scrambled" at the order of Art Collins and to end up with a "matching" pair is rare. Glen, K9STH Website: http://k9sth.com --- On Wed, 10/7/09, CARL SMITHSON <carlsmithson at dishmail.net> wrote: I just noticed that my 75s-3 and 32s-3 have the same serial number. Did Collins make pairs?