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TSL 122 strange sounds at louder volumes

Discussion in 'Marshall Amps' started by BobVigo, Sep 17, 2021.

  1. BobVigo

    BobVigo Member

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    Using the amp with my Mills Acoustics 4x12, not the internal 2x12s. Tried a different cab to rule out a speaker issue.

    It happens mostly on the lead channel - hear clip - but it’s also more prominent on the clean channel with the volume up.

    i swapped all but one preamp tube with good new JJ’s. I swapped the remaining with others I had and still the same issue.

    power tubes are new EHX. I added the stable bias mod maybe a few weeks ago. I haven’t checked the bias since I adjusted it after the install: could too hot of bias cause this?

    Any other suggestions as to what I should test and consider?


    https://www.dropbox.com/s/f0aaqrgzlndvwfk/TSL 122 strange sounds.m4a?dl=0
     

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