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ER40 High Voltage Frequency Transformer FramePower supply transformer ER40, horizontal transformer coil former. Bobbin size=41.2mmX40.1mmX31.7mm, Parallel Distance=34.8mm. Pin Pitch=5.0mm. Bobbin Size=41.2mmX40.1mmX37.0mm. ER40 phenolic bobbin. Custom made transformer, UL REC:94V-0