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Tibeliusgatan 7 International Domestic S-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 Mains Transformers for Tube Amplifiers LL1648, LL1649, LL1650, LL1651 C-core mains transformers. The core is assembled with a small air-gap to compensate for any mains DC- unbalance. Estimated power rating 250 VA which can be increased with good cooling. Magnetic stray is extremely small if secondaries of the two coils are loaded identically. Physical dimensions, pin and mounting hole layout (all dimensions in mm) 53 Primary connections Secondary connections 5 6 7 8 12 14 13 11 4 x M4 Mounting holes 90 14a 13a 110 Bottom view 16a 15a 1 2 3 4 16 18 17 15 14a, 13a, 16a and 15a are old positions 78 85 for secondary pins 14, 13, 16 and 15 Weight 2.5 kg Winding schematics: 1 2 4 3 Coil 1 Coil 2 5 6 13 11 17 15 8 7 14 12 18 16 Connection alternatives. Primary in series for 230V (left) and in parallel for 115V (right). 1 11 1 11 Prim 2 13 Sec 2 Prim 2 13 Sec 2 230V 3 12 115V 3 12 4 14 Sec 3 4 14 Sec 3 5 15 5 15 Sec 1 6 17 Sec 4 Sec 1 6 17 Sec 4 7 16 7 16 8 18 Sec 5 8 18 Sec 5 Copper resistance, no load output voltages and max recommended transformer current (rms) with primary connected to 230 V serial / 115V parallel and Sec 1 connected as above Type Primary res. Sec 1 Sec 2 Sec 3 Sec 4 Sec 5 Serial/parallel LL1648 7.5 W / 1.9 W 20 W / 350 V 0.1 W / 5.9 V 0.1 W / 5.9 V 0.1 W / 6.6 V 0.1 W / 6.6 V 0.63A 3.1A 3.1A 3.1A 3.1A LL1649 7.5 W / 1.9 W 8.4 W / 230 V 0.1 W / 6.6V 0.1 W / 6.6V 0.1 W / 6.6 V 0.1 W / 6.6 V 1.0A 3.1A 3.1A 3.1A 3.1A LL1650 7.5 W / 1.9 W 20 W / 350 V 0.1 W / 6.6 V 0.1 W / 6.6V 0.1 W / 6.6 V 0.1 W / 6.6 V 0.63A 3.1A 3.1A 3.1A 3.1A LL1651 7.5 W / 1.9 W 42 W / 500V 0.1 W / 6.6 V 0.1 W / 6.6V 0.1 W / 6.6 V 0.1 W / 6.6 V 0.43A 3.1A 3.1A 3.1A 3.1A Please note! Output current from rectifier: 63% of above with condensor input rectifier, 95% of above with R010507 choke input rectifier.