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Low loss Power Transformer ATQ15.5 BobbinATQ15.5 vertical bobbin, power transformer frame, 5+0/4+0 pins vertical ATQ15.5/14.3 coil former. Bobbin Size=15.4mmX15.0mmX14.9mm. Pin distance=3.0mm. Phenolic material ATQ series bobbins. China bobbin factory, custom made injection tooling, plant pin tooling, we also manufacture final transformers.