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Fault with Trace Elliot SMC300 amp head

Discussion in 'Amps and Cabs [BG]' started by The Mock Turtle Regulator, Dec 27, 2004.

  1. at soundcheck of my last gig (christmas eve) there was a farting noise coming from the speaker (trace 4 X 10) cab, which I thought was a torn speaker cone (couldn't tell which of the 4 though), got through the gig,

    but today trying the amp at home there's a loud humming noise regardless of the gain and master volume control settings, and the actual bass signal is quiet.
    the cab seems fine though- my old laney amp head works okay through it.

    also line out and DI out from the head into my 4track are fine-

    suggests that there's something wrong with the output stage-

    no visible problems with the board components.
    connections all seem secure.

    the 4 power Mosfets bear the no. E9902BY , and there's another transistor with a heatsink that i can't see any no. on as it is.

    the amp and cab are 5yrs old now, and use of distortion pedals has probably taken its toll.

    anyone had repairing experience with this amp, or similar?

  2. IvanMike

    IvanMike Player Characters fear me... Supporting Member

    Nov 10, 2002
    Middletown CT, USA
    Lol - distortion pedals won't hurt your amp

    sounds like it's time to have a good tech look at your amp. hopefully it's an easy fix
  3. thanks to Bassthing68 on the Bassworld forum I managed to find the fault and fix it myself-
    a dry joint under one of the smoothing capacitors on the power amp board.
    quick fix with a soldering iron and some solder.
    all fine now.