B&O Moving Coil stepup transformer. Type: U25/10 4068 The B&O MC stepup transformer is not known to many people and there is a good reason. B&O never produced MC cartridges and B&O never produced a transformer which they called MC stepup transformer. But B&O have produced many stepup transformers for microphones. Really high-quality transformers like the Swedish Lundal transformers. The B&O microphone transformers can be used as a Moving Coil stepup transformer and with an excellent sound. The stepup specification are: 1:16 1:8 This can be set by jumpers. The setup transformer is of course for MC cartridges with medium to high output like a some of the Ortofon cartridges. Where can you find these transformers? They are standard in all Beolab 5000 amplifiers of 1967.