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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 Moving Coil Input Transformer LL1943 LL1943 is a high turns ratio of our LL1933 high performance moving coil step-up transformer. The LL1943 transformer combines our dual coil structure with Cardas high purity copper wire in an oversized design. The objective with LL1943 is to provide an alternative for the amorphous core LL1941 for those who prefer a low distortion, linear magnetization curve nickel lamination core transformer. 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 : 16 + 16 Pin layout (viewed from component side) and winding schematics: 1 10 5 10 4 9 2 9 LL1943 Top view 8 5 6 2 7 1 6 4 7 Can + core 8 Dimensions (L x W x H above PCB, in mm) 47 x 28 x 24 Spacing between pins 5.08 mm (0.2") Spacing between rows of pins 35.6 mm (1.4") Rec. PCB hole diameter: 1.5 mm Weight: 115 g Static resistance of each primary: 0.8 ? Static resistance of each secondary: 85 ? Frequency response (serial connection, source 10 ?, 8 Hz -- 100 kHz +/- 1.0 dB no load / secondaries open): Isolation between windings/ between windings and core: 3 kV / 1.5 kV Connection alternatives: Serial-serial connection 1 : 16 Parallel-serial connection 1:32 + 5 10 10 5 4 LL1943 9 4 LL1943 9 Top view 8 Top view 8 2 7 2 7 1 6 + + 6 + 1 Cartridge is grounded through primary Cartridge is grounded through primary center tap. If phono preamp input is “cold”. If phono preamp input is unbalanced, connect pins 9 and 8 to input unbalanced, connect pins 9 and 8 to input ground. ground. If cartridge cable is unbalanced (such as a coaxial cable), ground cartridge through pin 2 and not through pins 1+4. R101122