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Tibeliusgatan 7 International Domestic LUNDAHL S-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 TRANSFORMERS SWEDEN Fax +46 - 176 13935 0176-13935 Audio transformer for tube preamp line output LL1930 LL1930 is designed to be a line output transformer for tube preamp parafeed output applications. The core is a high permeability mu metal core. The transformer has no internal Faraday shield or magnetic shield housing. Turns ratio: 5.8 + 5.8 : 1 + 1 Pin layout (viewed from component side) and winding schematics: 5 10 5 10 4 9 4 9 LL1930 3 Top view 1 6 2 7 1 6 2 7 Core 3 Dimensions (L x W x H above PCB, in mm) 47 x 28 x 23 Spacing between pins 5.08 mm (0.2") Spacing between rows of pins 35.56 mm (1.4") Rec. PCB hole diameter: 1.5 mm Weight: 105 g Static resistance of each primary (pins 1-2, 4-5): 610? Static resistance of each secondary (pins 6-7, 9-10): 16? Distortion at 30 dBU primary signal. Source impedance < 0.1% at 50Hz 4.5k. Primaries connected in series. < 1% at 25Hz Frequency response. Connection and signal level as above. 20 Hz – 30kHz < +/- 0.1 dB Secondary load 10k. Isolation between windings/ between windings and core: 4 kV / 2 kV R071217