These coils were used for measurements and development of JF coils.
 In perfect working condition.
 
ERSE 3.0mH 18 AWG Perfect Layer Inductor Crossover Coil
 
18 gauge perfect layer air core inductors are excellent for high quality crossover construction. The layers are wound very tightly and bonded together to keep the DCR to a minimum. The air core ensures no saturation, hysteresis, or other magnetic distortions. Made in the USA.
Specifications: • Inductance 3.0 mH • Wire gauge: 18 AWG • Core type: Air • DC resistance: 0.93 Ohms • Tolerance ±2% • Power handling: 300 watts RMS • Dimensions: 2-1/2" D.