Handbuilt and hand-wired in the USA, the Ampeg Heritage Series B-15 is a limited-edition tube bass combo amp for the true bass connoisseur. You'll instantly gravitate to its classic flip-top design, double-baffle cabinet, and all-tube head with two distinct channels and bias modes that meticulously re-create the world's most sought-after bass tone. Each channel on the B-15 Heritage has its own flavor and bias mode for the ultimate in tone control. Channel 1 is based on a 1964 B-15NC, while Channel 2 is based on a 1966 B-15NF. Selectable 1964 cathode-bias or 1966 fixed-bias modes deliver even more classic tones along with the legendary Baxandall bass/treble tone stack on each channel. The double-baffle cabinet design delivers classic tone from a custom-designed 15" U.S.-made Eminence driver with a 109 oz. magnet. .