It seems to me you are right, David ,the receiver must be an ARA set, it has single aerial post, since its range is 1.6 to 3.0 Mcs, looks like an SCR-274 but with double tuned IF cans(2 trimmers) and all the canned caps are marked ARC. I have no info about the ARA sets but no problem because the receiver its working now, and I began to restore it. Thanks for all. Carlos , LU8DOG 73's and DX's