“This is your chance to own the sound that defined heavy metal. Don’t wait, once they’re gone, they’re gone”: Ashdown and Reverb are selling Geezer Butler’s Head Of Doom bass amps from Black Sabbath’s final show, signed by the man himself Music October 8, 2025Truth & Data Team This Reverb exclusive offers 15 of the heads used at Villa Park, autographed, with each coming with a COA from Ashdown MD Dan Gooday