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Heavy distortion on channel 2

Any repair techs on here who have come across heavy distortion on an ma2400 macrotech it’s there right from start as soon as it has a signal passed through it any help would be very helpful

Comments

  • Symptom on both or single channel? Check and clean the CMMR pot!
    Use 1K sine signal : What is AC voltage output value @ no load?
    How does the signal look like at full output swing? Does it clip symmetrically?

    Alain

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