4sirip atas 6sirip bawah dimensi 2,46 x 2,28 x 1,43 Alumunium Heatsink D313 2525 2,46cm ( 24,6mm) 2,28cm ( 22,8mm ) 1,43cm ( 14,3mm ) 4 sirip atas almunium heat sink pendingin transistor mosfet TR tip31c tip32c tip41c tip42c tip hetsing heatsing audio