Lundahl Moving coil input transformer, LL1963

Amorphous Core Moving Coil Input Transformer LL1963

LL1963 is a low turns ratio, low impedance moving coil step-up transformer. The LL1963 transformer combines our dual coil structure with Cardas high purity copper wire in an oversized design.

The objective with LL1963 is to provide an alternative suitable for solid state systems, where the classical high turns ratio transformers are not required. The mu metal laminations results in low distortion and a linear magnetization curve.

The purpose of the Faraday shield is to make galvanic isolation between cartridge and phono-stage possible. The dual-coil structure greatly improves immunity to external magnetic fields from power supplies, motors etc. The transformer is housed in a mu-metal can.

Turns ratio: 1 + 1 : 3.1 + 3.1

Dimensions (L x W x H above PCB, in mm): 44 x 30 x 24
Spacing between pins 5.08 mm (0.2")
Spacing between rows of pins 35.6 mm (1.2")
Rec. PCB hole diameter: 1.5 mm
Weight: 115 g
Static resistance of each primary: 0.9 Ohm
Static resistance of each secondary: 5.8 Ohm
Frequency response (serial-serial connection, source 50 Ohm, load 330Ohm, relaite to 1kHz): -1dB at 20Hz, -1dB at 100 kHz
Isolation between windings/ between windings and core: 3 kV / 1.5 kV