Lundahl Filament current choke, LL1694

Filament Current Choke LL1694

The LL1694 is a 2 coils 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: 0.83 kg
Static resistance of each winding: 0.9 ? Isolation between windings / between windings and core: 4 kV / 2 kV

Coils in series
Approx. Inductance: 0.16 H
Recommended DC current (1.25 T): 1.5 A
Saturating current (2.0 T): 2.4 A
Max. ripple voltage at rec. DC current (Ripple voltage is approx. 0.42 x input voltage): 50 V rms / 100 Hz

Coils in parallel
Approx. Inductance: 0.04 H
Recommended DC current (1.25 T): 3 A
Saturating current (2.0 T): 4.8 A
Max. ripple voltage at rec. DC current (Ripple voltage is approx. 0.42 x input voltage): 25 V rms / 100 Hz