The tube preamp section of the Ampeg SVT-3PRO Series Head re-creates the great bass tone that made the original SVT the most respected bass amp of all time. The power section is solid state with a toroidal transformer that generates less noise and magnetic interference. Delivers 450W @ 4 ohms and has an arsenal of tone-shaping tools: 3 bands of tone, a 5-position mid selector, 9-band graphic EQ, plus low and high boosts. Other pro features include input peak LED, input pad and bright switch, mute function, tuner out, variable line-out level, time-delayed turn on, DC-supplied filaments, and variable fan speed. 2U rackmount..