FER RITE THYROIDAL CORES MATERIAL 77 {upgrade of the 72 material) Permeability 2000 Core 0.0, LD, Hat. Value number inches) (inches} {inches) em) {emi? {em)3 b/ 1000 turns: FT-23 77 230 Az0 080 1.34 021 028 396 FT-37 .77 375 187 128 2.5 076 163 884 FT-808 77 500 281 .188 3,02 33 LAY 1100 FT-50A 77 BOG 312 260 3.68 152 889 1200 FT-508 -77 500 312 500 38 303 963 2400 FT-82 77 825 52ยข .250 5.26 246 1.294 1170 ET-114 77 1.142 780 285 742 375 2783 1270 FT-114A-77 1.142 760 545 7.42 B90 5,120 2340 FT-140 77 1.