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EE33 EI33 High Voltage Transformer Vertical BobbinEI33 transformer core bobbin. 6+6 pin vertical EE33 bobbin. Parallel Distance=22.5mm. Pin pitch=5.0mm. Bobbin size=28.5mmX28.2mmX27.8mm. Ei/EE series ferrite cores widely used in power transformers and high frequency transformers, welcome customized transformer and inductors.