An amplifier for the bass circuit with fully valved, which is an excellent choice of amplification, it goes beyond other conventional tube amps because the Bass tube uses three valves in series preamp which provides more gain, volume and definition has sound super clean, full bodied, velvety and with plenty of fat, things that only a good tube amp can provide, their processors are carefull calculated and constructed to play the lower frequencies of bass that is until he comes up to 30Hz, while keeping the major firm, determined and powerful, an excellent choice for demanding bass players who do not like amplifiers monstrously large, Bass tube is very small and easy to carry.