High Performance Mic Input/Line Box Transformer from the renowned Lundahl Transformer company.
The LL1578 is a high performance microphone input transformer/line-box transformer with high permeability mu-metal cores and high bandwidth coils. 
The LL1578 uses the same pin-out as our well known microphone transformer LL1538.
The primary and secondary windings are separated by electrostatic shields. 
The very low leakage inductance and thus excellent frequency response is achieved by a two-coil, three-section per coil winding structure.
The transformers are encapsulated in mu-metal cases for magnetic shielding  
Please allow 3-4 weeks for delivery until we have stock