Beam power tetrode used in vintage Ampeg and Gibson guitar amplifiers. Also, used in tube hi-fi equipment made by Fisher, Scott, and Harmon-Kardon.

Tired of saying "fuggettaboudit," "can't get 'em," "UNOBTANIUM!"? Well, now we got 'em. And they're for real! Smooth, yet punchy, with a sweet harmonix finish, this year's vintage from New Sensor. Ampeg owners, rejoice!