Need help replacing Transistor

Discussion in 'General Electronics Chat' started by JBmtk, Jul 28, 2009.

  1. JBmtk

    Thread Starter Member

    Jun 29, 2009

    I have a blown subwoofer from Onkyo and I noticed that on the bottom of the PCB, the two power transistors, KTB1369, (DATASHEET) showing obvious signs of a burn out. There were scortch marks on the traces and the solder was blackened.

    I was hoping that I could put in a pair of two power PNPs to replace them instead of buying the exact models....what do you guys think? The datasheet has me confused because the numbers are mostly negative?

    Also, the fuse next to the secondary on the transformer was not blown, is it safe to assume that the rectifier circuit is OK? I only ask this because I am limited to what I can see without taking the whole darn thing apart.
    Last edited by a moderator: Jul 28, 2009
  2. Audioguru


    Dec 20, 2007
    The numbers are negative because it is PNP.

    A replacement is difficult to find because:
    1) It has a high voltage rating.
    2) It has a high HFE for a power transistor.
    3) It has a very high transistion frequency.
    4) Maybe it must match an existing NPN transistor.