2SD257
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NPN Triple Diffused High-Voltage Deflection Transistor (1500V 5A), TO-3, Toshiba, Industry Equals: 2SD257, 2SD820, NTE192
Madison TV 3 - D16
NPN Triple Diffused High-Voltage Deflection Transistor (1500V 5A), TO-3, Toshiba, Industry Equals: 2SD257, 2SD820, NTE192