High Performance Mic Input/Line Box  from the renowned Lundahl Transformer company.
The LL1578 XL is a high performance microphone input transformer/line-box transformer with high permeability mu-metal cores and high bandwidth coils.
The LL1578XL uses the same pin-out as our well known microphone transformer LL1538.
In the LL1578XL the core is about 45% larger than in the LL1578, resulting in a higher signal level capability.
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