It says 9V. No jack polarity indicators or label on the original supply, either. Perhaps I was testing incorrectly… Would it be too intrusive to ask if I could bring the pedal in for some in-person advice? I understand if you’d rather not do this, and will gladly post pictures if you’d prefer. I just think it’d be easier on both of us if I could go ahead with my suggestion. Again, if not, let me know.