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Tibeliusgatan 7 International Domestic LUNDAHL SE-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 TRANSFORMERS SWEDEN Fax +46 - 176 13935 0176-13935 Filament Current Choke LL2733 The LL2733 is a 2 coil choke for tube/valve filament current filtering. The coil is wound using our standard high internal isolation technique with isolation foil between each copper layer. The core is an audio C-core of our own production. Winding schematics, physical dimensions, pin and mounting hole layout (all dimensions in mm) 35 10 19 13 4 10 4 4 x M3 Mounting holes 75 95 Bottom view 19 13 53 75 Weight: 1.35 kg Static resistance of each winding: 1.7 ? Max current through each winding (10W heat dissipation): 1.7 A Isolation between windings / between windings and core: 4 kV / 2 kV Coils in series Coils in parallel Type Approx. Recommended Saturating Approx. Recommended Saturating Inductance DC current current Inductance DC current current (1.25 T) (2.0 T) (1.25 T) (2.0 T) LL2733 / 1.7A 0.4 H 1.7 A 2.7 A 0.1 H 3.4 A 5.4 A Max. ripple voltage 120 V rms / 60 V rms / at rec. DC current 100 Hz 100 Hz (Ripple voltage is approx. 0.42 x input voltage) Suggested connections: Serial connection Parallel connection 10 19 10 19 LL2733 LL2733 4 13 4 13 Serial connection for improved common mode rejection 10 19 LL2733 4 13 R090902 Note! The LL2733 can also be used in choke input power supplies