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EF20 High Voltage Transformer Horizontal FrameEF20 PCB mounting transformer, single slot EF20 dip bobbin 5+5 pins. Bobbin Size=21.8mmX21.2mmX16.5mm. Pin pitch=3.8mm, Parallel distance=15.4mm. Phenolic material EF20 coil former. We make new bobbin tooling to meet size requirement, OEM/ODM transformer also acceptable.