Lundahl LL1570 / LL1570XL - LL1570

The LL1570 is a very high-quality, general-purpose audio transformer suited to low-turns-ratio mic input, ground isolation, balanced-to-unbalanced conversion, and 1:1+1 splitting. Careful design keeps capacitive coupling between the transformer's internal sections to a minimum, and the three-section winding used here delivers exceptionally wide bandwidth. It's built from two coils, each with primary and secondary windings separated by electrostatic shields, around a high-permeability mu-metal core. The LL1570XL uses a core roughly 45% larger than the standard LL1570, giving it greater signal-handling headroom.

Lundahl transformers are mainly used in the output/interstage of tube amplifiers, in microphone and line inputs, and for galvanic isolation in studio and live sound systems (DI boxes, ground-loop breakers). The Swedish manufacturer winds its own copper wire and casts its own cores for every model, resulting in very consistent, factory-measured parameters even in series production. For custom loudspeaker or amplifier builds, tube amp restorations, or premium DI box projects, Lundahl transformers provide a reference-quality foundation, and most output types are available for both push-pull and single-ended (SE) stages. The brand has earned the trust of major names across the audio industry - studios, instrument and amplifier makers - over several decades, and many designers build their circuit specifically around a Lundahl transformer because the catalogue parameters (inductance, leakage inductance, DC resistance, saturation level) are reliably reproducible from unit to unit. Before installing, it is worth double-checking the exact impedance match and the available mounting space, since size and weight can vary significantly between types.

Swedish manufacturer Lundahl Transformers AB has been hand-winding custom iron-core audio transformers for more than half a century, used by leading tube amplifier designers and studios worldwide for reference-quality signal transfer.

Package weight: approx. 0,1 kg.