Help to identify this transformer (Algemeen)

door soundman2 , Wouw, 30.03.2020, 20:18 (1699 dagen geleden) @ edison

Seems to be an impedance transformator, used e.g. in 100 or 70 volt loudspeaker distribution systems.
Today power selection is choosen at the primary side with only a few speaker impedances at secondary e.g. 4 and 8 Ohms. In early systems power selection was done in secondary circuit.