Technics SU-V9 recap

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  • TechnicsHiFiFan
    Member
    • Mar 2018
    • 13
    • Australia
    #1

    Technics SU-V9 recap

    Hello,

    My Technics SU-V9 would run perfectly then when i used it again the relay would not kick in, replaced the thyristors, and noticed one of two of the caps had green fungus on one of their legs.

    pre drive board has a few caps as does the main board

    Ive used Nichicon PW, Wima for values under 1uf, and Panasonic SU for the one bi-polar? maybe i should have used Nichicon EP?

    Pre drive board not sure, the VCC/GND caps. I am thinking low esr over Audiograde caps but fear to change the sound. The V9 was sounding a bit on the bright side so maybe something was wrong with it

    The large main capacitors are 18000uf 56v and look fine and flat, not sure to change them or not. If so maybe CDE 380LX or UCC SHM or KMH?




    pre drive board i had to seperate the image as it was long



    thank you
    Sam
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8133
      • Canada
      #2
      Re: Technics SU-V9 recap

      Yep, these caps are toasted. They leaked all over the place. You have to get that cap juice off the board, so clean that really good. In which position were those caps in? BTW, if I'd had that for repair, I'd be doing a full recap

        Comment

        • TechnicsHiFiFan
          Member
          • Mar 2018
          • 13
          • Australia
          #3
          Re: Technics SU-V9 recap

          Thank you Capleaker for the reply

          Yes they are on the main board, the top one is the V9, the pre drive is fine the caps but i would expect since i am doing the mainboard have to see what to use there?

          mainboard mix of PW and FR ( maybe should have gone all PW and Wima) Main caps look nice and flat not sure if they have any issues



          pre drive board caps fine here going by my eye. Again if I did the main had some bad caps, maybe is wise a full recap , very few caps with the V9

          Last edited by TechnicsHiFiFan; 03-24-2018, 07:21 PM. Reason: typo error

            Comment

            • madan1
              Badcaps Veteran
              • Nov 2016
              • 682
              • Bulgaria
              #4
              Re: Technics SU-V9 recap

              Get few out of the board and measure them.. if they read good, leave them ( at lease this is what I'd do ). Pay more attention to caps from the power supply circuits and near to heatsinks.

                Comment

                • TechnicsHiFiFan
                  Member
                  • Mar 2018
                  • 13
                  • Australia
                  #5
                  Re: Technics SU-V9 recap

                  Thanks Madan1
                  The pre-drive board the topside faces the heatsink
                  recap power ciricuit with FR. and PW. Not sure if I should have it all PW

                  image from the net from the front of the V9, the pre drive board faces the heatsink, space between cap top and heatsink would be about 1cm - 2cm

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