[Hammarlund] more on Collins Filter for Hammarlund

[Brian Harris]

I've learned a little more about the mysterious Collins-made 3.1Kc filter for a yet-to-be-determined Hammarlund piece which is no doubt a receiver.  It uses a 6AK5 and a 9003, which is silkscreened near the tubes.  The Collins part number is 522 9032 014.  The Hammarlund part number is MFA-3.  The unit plugs into a 7 pin miniature tube socket. I've uploaded a picture of the filter at http://www.myhamshack.com/WA5UEK/.  I would very much like to determine what receiver this was meant for.

Brian Harris
cell 214-763-5977
email cosmophone at yahoo.com