Single 12 Hammerhead Combo in fantastic shape. SOUNDS GREAT! Based in Pittsboro ,NC, Carr Amplifiers makes hardwired amps which frequently draw comparisons to classic tube amps from the 50s and 60s. The Hammerhead is no exception and delivers major tube-based tone with two 12AX7s and two EL 84s. The Hammerhead series has been discontinued in recent years.