thumb trimmer bartollini

  1. albertforns

    Help: Trimmer function on a Bartollini preamp of a 1990 Thumb NT6?

    Hi I have a 1990 Thumb NT6 with the original Bartollini electronics. It's a second hand instrument I've been ownig for years but never had a manual etc. Just looking the inside electronics, I found that the preamp has a trimmer. I don't know the model of the preamp. Can anybody say what is...
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