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EF20 High Voltage Transformer FrameFerrite core EF20 bobbin. 7+8 pin horizontal EF20 DIP coil former. Bobbin Size=25.0mmX20.0mmX16.5mm. Pin pitch=2.5mm, Parallel distance=20.0mm. China EF20 bobbin factory. We have various size bobbin tooling. We manufacture final transformer for customer.