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2SB633 PNP transistor equivalent suggestions Marantz PM310

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    2SB633 PNP transistor equivalent suggestions Marantz PM310

    Hi All,
    I have a 30+ year old Marantz PM310 that is blowing fuses. It appears that one of the output transistors (Q732) is shorted (Q731 is fine). It's a 2SB633 which does not seem available from the usual suppliers. Is there a more modern equivalent which would do the job?

    The complimentary NPN (Q729 & Q730) is a 2SD613.

    I have attached the service manual.
    Many thanks.


    https://www.badcaps.net/forum/attach...1&d=1629738387
    Attached Files
    Last edited by SMDFlea; 08-25-2021, 07:18 AM.

    #2
    Re: 2SB633 PNP transistor equivalent suggestions

    these ones or check out mje---- types .. https://cdn.badcaps-static.com/pdfs/...1727ebd659.pdf

    Comment


      #3
      Re: 2SB633 PNP transistor equivalent suggestions

      Thanks Pete.
      I think I'll be safe with the B version (80V).
      I must admit I've never ordered from Mouser before.
      Are there any issues to be aware of?

      Comment


        #4
        Re: 2SB633 PNP transistor equivalent suggestions

        only the shipping prices .. i use rs and have an account so shipping is free . they will have the motorola mje ones .

        Comment


          #5
          Re: 2SB633 PNP transistor equivalent suggestions

          Can you suggest something from RS?

          Comment


            #6
            Re: 2SB633 PNP transistor equivalent suggestions

            thinking about it the ft might be a problem with mje ones .. TIP31C TIP32C might be a better choice .

            Comment


              #7
              Re: 2SB633 PNP transistor equivalent suggestions

              Thanks Pete, I have both in stock. Would you swap all 4?

              Comment


                #8
                Re: 2SB633 PNP transistor equivalent suggestions

                i would leave the good channel as is .

                Comment


                  #9
                  Re: 2SB633 PNP transistor equivalent suggestions

                  I replaced similar 2SBxxxx with MJE. Works fine. Change both channels. Sorry Pete…

                  Comment


                    #10
                    Re: 2SB633 PNP transistor equivalent suggestions

                    should not make much difference if any to the audio . outputs are just adding current .

                    Comment


                      #11
                      Re: 2SB633 PNP transistor equivalent suggestions

                      I have the NPN but not the PNP versions so have ordered some from my default supplier (CPC). I'll report back when it's installed. Many thanks.

                      Comment

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