High Performance Mic Input Transformer from the renowned Lundahl Transformer company.
The LL1571 is a microphone input transformer built up from two coils and a high permeability mu metal core.
Each coil is wound in three sections with electrostatic shields connected to separate pins. 
This results in a transformer with a very broad band, also ideal for splitting purpose. 
The two-coil structure in combination with the mu-metal can results in a high immunity to external magnetic fields 
Please allow 3-4 weeks for delivery until we have stock