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Main Power Transformer ER39 Bobbin 7+7 Pins7+7 pin ER39 vertical bobbin, high frequency bobbin, Bobbin size=39.0mmX33.0mmX48.3mm, pin distance=5.0mm, parallel distance=20.4mm. Phenolic material ER39 transformer bobbin EC39/44 cores. We manufacture final electronic transformer for power suppliers, low magnetic leakage and good performance, welcome customized transformers.