Lundahl Microphone Transformer, LL1927A

Ribbon Microphone Transformer LL1927A

(Difference between LL1927 and LL1927A is pinout) The LL1927A is a very high turns ratio transformers for active ribbon microphones. The transformer has an uncut amorphous strip core and is built up from two coils of each four sections for low leakage inductance.

Turns ratio: 1 + 1 : 55 + 55
Dims: (Length x Width x Height above PCB (mm)) 30 x 22.5 x 14.5

Spacing between pins positions: 2.54 mm (0.1")
Spacing between rows of pins: 22.86 mm (0.9")
Weight: 27 g
Rec. PCB hole diameter: 1.5 mm
Housing: Mu metal
Core: High mu amorphous strip core
Static resistance of each primary (average): 0.05 ?
Static resistance of each secondary (average): 182 ?
Frequency response (Source 0.3W, load 10kW. Connection 1 : 110. Secondary signal level 0dBU): 10Hz 70kHz +/- 1dB