One of the most powerful and versatile bass amps Fender has evercreated, the Super Bassman is a stadium-level 300-watt tube headdesigned for the biggest shows and the largest stages, withenormous Fender bass sound and sparkling vintage Fender looks.Perfect for stage and studio alike, its dual-channel design usesmodern technology to maximize classic technology, with classicFender late-'60s/early-'70s “blackface” styling and a wealth ofinnovative features on the front and rear panels.Features include a tube preamp (two 12AX7s) and power amp (one12AX7, one 12AT7, six 6550s); Vintage channel that delivers thefull, warm sound of a classic Fender passive tone stack; Overdrivechannel that delivers the aggressive and responsive sound of amodern active tone stack (choose between channels with includedfootswitch); rear-panel Fender Automatic Bias system thatconstantly monitors and re-biases tubes for perfect performanceand alerts you when service is required; Speaker Output switch thatcan be set to “Mute” to turn speaker off and record silently usingpreamp tone from the XLR output; Impedance switch (8, 4 or 2ohms) and master volume control with push/pull mute.