Lundahl Grid choke, LL1670

Grid choke LL1670

The LL1670 is a small size, high inductance grid choke for tube amplifiers. The choke is built with two coils and is using one of our own special audio C-cores. The coils is wound using a low capacitance coil winding technique. The two coil structure greatly reduces the risk of picking up hum caused by external magnetic fields from e.g. mains transformers.

Dimensions (mm)
(Length x Width x Height above PCB/ excluding pins) 43 x 28 x 20

Weight 88 g
Spacing between pins 5.08 mm (0.2")
Spacing between rows of pins 30.48 mm (1.1")
Recommended minimum PCB hole dimensions 1.5mm
Static resistance of winding 5.3 kW (2.65 kW+ 2.65 kW)
Max DC current per winding, all applications 10 mA
Isolation between windings and core 2 kV
Max signal at 30Hz 100V rms

Inductance (windings in series): 540 H
Standing DC current: 0.8 mA
Saturating DC current: 1.2 mA