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EF20 Main Power Supply Transformer Vertical BobbinEF20 DIP coil former, 5+5 pins vertical EF20 transformer frame, phenolic material EF20 bobbin. Pin pitch=3.8mm, Bobbin Size=22.0mmX13.5mmX21.10mm. Parallel distance=10.10mm. We manufacture final transformers, custom design and OEM transformers also acceptable.