2SB633 PNP transistor equivalent suggestions Marantz PM310

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  • Nevillet
    Badcaps Veteran
    • Sep 2019
    • 272
    • United Kingdom
    #1

    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.
    Tags: None
    • petehall347
      Badcaps Legend
      • Jan 2015
      • 4423
      • United Kingdom
      #2
      Re: 2SB633 PNP transistor equivalent suggestions

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

        Comment

        • Nevillet
          Badcaps Veteran
          • Sep 2019
          • 272
          • United Kingdom
          #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

            • petehall347
              Badcaps Legend
              • Jan 2015
              • 4423
              • United Kingdom
              #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

                • Nevillet
                  Badcaps Veteran
                  • Sep 2019
                  • 272
                  • United Kingdom
                  #5
                  Re: 2SB633 PNP transistor equivalent suggestions

                  Can you suggest something from RS?

                    Comment

                    • petehall347
                      Badcaps Legend
                      • Jan 2015
                      • 4423
                      • United Kingdom
                      #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

                        • Nevillet
                          Badcaps Veteran
                          • Sep 2019
                          • 272
                          • United Kingdom
                          #7
                          Re: 2SB633 PNP transistor equivalent suggestions

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

                            Comment

                            • petehall347
                              Badcaps Legend
                              • Jan 2015
                              • 4423
                              • United Kingdom
                              #8
                              Re: 2SB633 PNP transistor equivalent suggestions

                              i would leave the good channel as is .

                                Comment

                                • CapLeaker
                                  Leaking Member
                                  • Dec 2014
                                  • 7992
                                  • Canada
                                  #9
                                  Re: 2SB633 PNP transistor equivalent suggestions

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

                                    Comment

                                    • petehall347
                                      Badcaps Legend
                                      • Jan 2015
                                      • 4423
                                      • United Kingdom
                                      #10
                                      Re: 2SB633 PNP transistor equivalent suggestions

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

                                        Comment

                                        • Nevillet
                                          Badcaps Veteran
                                          • Sep 2019
                                          • 272
                                          • United Kingdom
                                          #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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