> The odd part was, the heart was a > Hazeltine #TR5RX02ZZ 890484 transformers, one winding 52vct, 680ma, the > other 115v, 380-420 cps. So are these intended to take 26vac 400hz, and > produce 115v for some aircraft eq.? Likely they were for synchro or resolver applications. 115 and 26 VAC 400 Hz is common for these systems.-John