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Thread: Crate BT-25 Noise Gate Issue

  1. #1
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    Crate BT-25 Noise Gate Issue

    Hey guys
    I'm working on a Crate BT-25 bass amp that's having a problem with it's distortion channel. When you play through it, certain notes have a strange decay, like a clipping. This isn't happening on the clean channel. From what i can gather the amp has a built-in noise gate on the distortion channel and i think that's what's acting up with the clipping. However, i can't for the life of me find what is activating the gate on the schematic. Any help is greatly appreciated!

    PWA Bass Amplifier PCB Schematics (848SCH_A).pdf

  2. #2
    Senior Member Enzo's Avatar
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    I'd have to see a noise gate in there before I'd think about what might be activating it. And I don't.
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    Quote Originally Posted by Enzo View Post
    I'd have to see a noise gate in there before I'd think about what might be activating it. And I don't.
    I wasn't seeing one either, but then the manual states "NOTE: The BT25/BT50 employs an internal noise gate to keep residual noise to a minimum".

  4. #4
    g1
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    Furthermore, "regardless of which channel is selected, the Clean channel's Level control (#6) must be turned above "0" for the noise gate to trigger".
    It is shown on the block diagram:


    bt25block.jpg
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