The Electro Harmonix 7591A tube is smooth and hard to get hold of. So, if you are tired of hearing: "fuggettaboudit," "can't get 'em," "UNOBTANIUM!" when you ask for a 7591A. Well, now we got 'em. And they're for real! Smooth, yet punchy, with a sweet harmonix finish, this year's vintage. Ampeg owners, rejoice!