Lundahl Filament current choke, LL2751

Filament Current Choke LL2751

The LL2751 is a small size two-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.

Weight: 0.44 kg
Static resistance of each winding: 0.5 W
Isolation between windings / between windings and core: 4 kV / 2 kV

Coils in series
Approx. Inductance: 0.18 H
Recommended DC current (1.25 T): 0.6 A
Saturating current (2.0 T): 1A
Max. ripple voltage at rec. DC current (Ripple voltage is approx. 0.42 x input voltage): 30 V rms / 100 Hz

Coils in parallel
Approx. Inductance: 45 mH
Recommended DC current (1.25 T): 1.2 A
Saturating current (2.0 T): 2 A
Max. ripple voltage at rec. DC current (Ripple voltage is approx. 0.42 x input voltage): 15 V rms / 100 Hz