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Thread: Altec Lansing 1650 equalizer problem

  1. #1
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    Altec Lansing 1650 equalizer problem

    I find old Altec Lansing 1650 Equalizer. There have been several changes over time.
    The equalizer works but sometimes totally random made a very loud "boom", exactly like a shotgun fire.
    I can not use in this way, the boom effectively scares the audience.
    What to do ? Where can I find a schematic ? Have anyone else the same problem?

  2. #2
    Senior Member
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    Richmond Hill, Ont.
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    Here's the 1650 Schematic .

    From; GPA's Library

    Electronics of that vintage should have all the power supply capacitors replaced.


  3. #3
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    Thank you very much.

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