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2SK82 (P-Channel) and 2SJ28 (N-Channel) Vertical Field Transistor (VFET) are used in Sony Class First Class-D Amplifier (Model: TA-N88(B). Its has a Vp rank code of KE-33 Mark on the part. The parts are guaranteed new, unused. It may just be the last New Old Stocks left in the world.

Documents:
Application of Vertical FET for Pulse Width Modulation
PWM VFET Report in Japanese
Specifications in Japanese
2SK82 V-FET DC Power Amp Schematics