Excessive Hum issues!



  • If you ground the Positive grid Spark amp...... the hum issues will disappear !!!!! Use a thin wire attached to the Input jack and the other end attached to the ground point of the outlet you're using!!!



  • Indeed!?!
    The Hum goes away if you ground the spark amp?😲😳
    That's new 😂
    Great note, thank you very much.