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  • Need help with my amp

    I have an SWR 350 'Pre-Fender Red Face' that has a very loud hiss/hum.







    I am running it through an Ampeg 410 HLF. It has not been in uses for the last 2-3 yrs or so, and I recently started playing with a band again. It was pretty dirty and I blew it out and replaced the pre-amp tube with a GT 12Ax-7, & De-Oxed the pots. I went straight from bass to amp. I tried several basses and still had the hiss so I am convinced it has to be the amp. Bad tube? Ground? Still Dirty? Any Ideas?
    "...I’ve wasted so much time
    Coming up with questions
    Asking, “Why?” has never answered much for me
    And really, who am I?
    To never feel the weight of burden?
    When was I promised simplicity?... " -Stavesacre-

  • #2
    Do the symptoms exist with the previous tube?
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    HC Geezer Brigade #150

    Comment


    • #3
      Did you forget to feed the gerbil?
      Dennis Hopper's retirement plan, except Dennis is dead
      Retired and likin' it a lot!
      Regards. Rimmer

      Comment


      • #4
        I can't honestly say that the problem existed with the old tube. The last time I turned this amp on was in 2009. The tube that was in there was at least 5-6 years old, it has been sitting for so long I thought a new tube would do it some good. I do still have the old tube. Should I pop it back in and see what happens?
        "...I’ve wasted so much time
        Coming up with questions
        Asking, “Why?” has never answered much for me
        And really, who am I?
        To never feel the weight of burden?
        When was I promised simplicity?... " -Stavesacre-

        Comment


        • #5
          Yup!
          Dennis Hopper's retirement plan, except Dennis is dead
          Retired and likin' it a lot!
          Regards. Rimmer

          Comment


          • FLSTC
            FLSTC commented
            Editing a comment

            take the pre-amp out , and resolder all the solder-joints of the potmeters , chassis jacks.and the tube-socket.

            It's already an older amp , and due to "galvanic corrosion" the pins of these parts might come a bit loose in the solder-joints..

             









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