Lundahl Silver wire Line input transformer, Amorphous core, LL1948Ag

Silver Wire, Amorphous Core Line input Transformer LL1948Ag

LL1948Ag is a high-level line input transformer for audiophile applications, suitable for amplifier line input with or without phase splitting. The windings are arranged to give perfect symmetry and high noise immunity. The two coil structure also greatly improves immunity to external magnetic fields from e.g. power supplies and motors. Primary and secondary windings are separated by electrostatic shields. The transformer is housed in a mu-metal can.

Turns ratio: 1 + 1 : 1 + 1

Dimensions (L x W x H above PCB, in mm) 43 x 29 x 23
Spacing between pins 5.08 mm (0.2")
Spacing between rows of pins 30.5 mm (1.2")
Rec. PCB hole diameter: 1.5 mm
Weight: 81 g
Static resistance of each primary: 72?
Static resistance of each secondary: 72?

Distortion (primaries connected in series, source impedance 600?): + 25 dBU 0.2% @ 50 Hz; + 28 dBU < 1 % @ 50 Hz

Self resonance point: > 120 kHz
Frequency response (source 600?, load 10 k?, serial connection): 10 Hz -- 100 kHz +/- 1.0 dB
Phase response (deviation from linear phase) 20 Hz 30kHz, +/- 0.5
Isolation between windings/ between windings and shield: 3 kV / 1.5 kV