The Mesa Boogie Bass 400+ Tube Set consists of 4 x 12AX7 preamp tubes and 6 x 6L6 power tubes.
Artists often call to rave about the Mesa Boogie Bass 400+ after switching from bi- or tri- amped rigs of up to a thousand watts—exclaiming the joy of stepping forward in the mix, even to the point of leading the band. String definition so articulate that the rhythm section locks together to become one machine of unstoppable momentum.
Traditional style rotary tone controls, which shape the Bass 400’s all-tube character are fed from dual Inputs, one for modern active basses and the other for classic passive instruments. Each of these has its own separate tube input stage and volume control. A seven-band Graphic Equalizer further details the amp’s inherent musicality, making subtle or radical tonal changes possible and footswitchable.
No less than twelve fan-cooled 6L6 output tubes deliver 500 watts of transient power peaks with cool reliability. And this is no dirty dozen: this is a four-rack, twelve-pack of pure mean punch. You’ll be happy to know that tube life is commonly reported to range from three to five years, and often longer.
Use our tube selector option to pick your preferred preamps and matched power tubes for your Mesa Boogie Bass 400+ Tube Set, and make your amp sing with power and tone.