Lundahl LL2755 - 60 ma

The LL2755 is a dual-coil, C-core output transformer for tube amplifiers, built for an 11 kΩ : 8 Ω impedance ratio for the 813 and similar tubes, and available in PP and SE versions. The coil uses Lundahl's high-internal-isolation winding technique, with insulating foil between every copper layer, wound on an in-house-made audio C-core.

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. 5 kg.