36770 - Coils, Transformers, Reactors & Chokes for Electronic circuitry
3677012 - - RF chokes
3677013 - - RF coils
3677014 - - IF transformers
3677032 - - Audio transformers
3677033 - - Low frequency chokes
3677041 - - Plate & Filament transformers + Autotransformers, except toroidal
3677061 - - Pulse transformers, Computer & other Types
3677071 - - Television transformers & Reactors, Horizontal output, Vertical deflection, Focus coils, Deflection yokes, etc.
3677091 - - Toroidal windings, Transformers & Reactors, except complete magnetic amplifiers
3677092 - - Coils, Transformers, Reactors & Chokes: other (Balum coils, Permeability tuning devices, etc.)
3677XX2 - - Coils, Transformers, Reactors & Chokes for Electronic circuitry (Miscellaneous)