Mike B wrote; > I have a set of 1414 kHz IF transformers but am not sure if they are for > a BC-454 or an R-26/ARC-5. They are marked 7274, 7275 and 7276. Those are the correct IF part numbers for the 3 to 6 MHz receiver in ALL systems using that receiver: RAV CBY-46105 ARA CBY-, CCT-46105 SCR-274-N BC-454-A, -B AN/ARC-5 R-26 Mike / KK5F