I am selling here a GENUINE Sansui NMA1216 output power transistor made by Sanken for Sansui (One Piece).

“**NM**” stands for **non-magnetic**.
While the collector on the most TO-3 transistors is made of iron, in this model it is made of aluminum.
*(Note: The top of the TO-3 case—where the model number is printed—is made of iron.)*

Maybe it is the last chance to get very rare output High-Speed TO3 transistors for yours premium Sansui amplifier.
Installation of those transistors must be done by a qualified technician only!!!!
Because transistor is New Old Stock, it might have some scratches, but it is unused and tested by semiconductor tester.