The transformers are made in Germany in the 50ties and sixties as step up transformers for professional studio and cinema equipment. Companies like Emt , Neuman , Siemens Klangfilm and Telefunken used this transformers
it´s a perfect match for EMT and other low impedance moving coil systems as step up input transformer
the sound of the transformers is very dynamic and the amplification is very high (26dB) . the cover is shielded and made of metall
I checked the coils with a multimeter - coils are working
The step up ratio is 1:20 , input coil has 3,5 Ohm
I made a little audio test with a EMT Tondose and a telefunken tube amp equiment - sounds really great! Also my db audio meter reports nearly matching measurements on both transformers.
diameter of mounting hole ca 8 mm
diameter of transformer body ca 29 mm
high 23 mm (without mouting)
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