Mesa says, "750 Watts of Crushing Low End!"
(click images for larger view)
From the Mesa Website:
The Big Block 750™ from Mesa Engineering
Bassists who Rock gotta have the Big Block. And here it is...
Answering your demands for a rig bad enough to anchor our Recto’s wall of gain, here is 750 watts of crushing fundamental. Pure and Mean.
Simplicity rules this front panel. No high-tech overkill between you and fast, fat tone. Straight-ahead circuitry delivers instant attack with massive authority. Just the brutal, potent truth, served up with mighty attitude.
Our exclusive Simul-State™ technology provides all-tube performance from Input jack right up to the dual MOSFET power blocks.
A classic all-tube tone stack is augmented by an additional Active Mid with a sweepable Frequency control. This lets you zero in on the precise region of attack to let you drive the band where it needs to go.
FEATURES
Handbuilt in Petaluma, California (as are all MESA products)
750 Watts @ 2 Ohms (550 @ 4, 280 @ 8), Simul-State Power / 12 Tube Driven Power MOSFET's, 4x12AX7
Active/Passive Input Switch
8 Stage Vacuum Tube Preamplifier with Gain, Active Bass, Active & Passive Mids, Mid Frequency (adjustable from 200 Hz to 2 kHz), Active Treble & Master Volume Controls
Footswitchable Vacuum Tube Over-Drive with Independent Over-Drive & Master Level Controls
Tuner Output with Footswitchable Amplifier Mute
FX Loop with True "Hard" Bypass Switch
Balanced XLR Line Out with Pre/Post Switch, Level Control & Ground Lift
2 - Speakon and 2 - 1/4 Speaker Output Jacks
Slave Out w/Level Control
Two Speed, Dual Fan Cooling
2 Button Footswitch (Over-Drive & Mute)
Formats:
Rackmount Bass Amp • 2 Rack Spaces
Big Block 750 Head • Blk Bronco (Standard)
More features and pix of this Freight Train of Thunder on the Mesa Website.