Yes, the INRAD filters contain transformers. I think they are lattice type as opposed to the NS ladder filters. Clark WA3JPG -- FAQ on WWW: http://www.contesting.com/tentecfaq.htm Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com Search: http://www.contesting.com/km9p/search.htm