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Big Block logo Photo of Big Block 750 on RoadReady Cabinet
  Big Block 750 on Road Ready Cabinet

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.

Active and Passive Mid controls
Big Block features dual MID controls. A wide band PASSIVE MID takes care of overall midrange blend while the semi-parametric ACTIVE MID lets you focus in on specific regions.

A footswitchable all-tube Overdrive, sporting its own dedicated Drive and Master controls, adds a menacing growl to your sound, sinking teeth into the mix.

All Tube Overdrive Overdrive Master
All Tube Overdrive circuit allows a warm range of distortion, from subtle fur to a rebellious grind. Overdrive MASTER gives you a separate volume level for the Overdrive mode.

Twin fans cool the dual power blocks arrayed with no less than 12 custom matched MOS-FET output devices. Even these power units are directly driven by one of the 8 tube stages in the Big Block 750. This is Simul-State. Tight and focused, warm and musical.

Big Block's Inside Circuitry
M-Pulse All-Tube Preamp guarantees musical warmth all the way through the tube driver stage. Dual power blocks with dual cooling fans house a battery of 12 custom mosfets! Massive toroidial transformer produces stunning current while reducing noise.

For convenience, Tuner outputs are provided front and rear. Rear panel features also include a series Effects Loop and a Slave Out with its own dedicated Level control.

Tuner Output with Mute function
Handy Front and Rear Panel Tuner Outputs with Footswitchable Mute Function allows silent tuning during performances.

A balanced XLR Direct Out is
switchable between Pre and Post
and includes a separate Level control and Ground Lift. Quarter inch and Speak-On jacks deliver this massive horsepower to the cabinet(s) of your choice.

Speak-On XLR Speaker Outputs
The massive power of Big Block calls for Heavy Duty “Speak-On” XLR speaker outputs. Current this big likes a wide road to travel on. Standard ¼ inch are also provided for compatibility with any cabinet.

The heritage of rock bass has been built on vacuum tube tone. The Big Block 750 elevates today’s bass performance while paying homage to that great tradition. Here is a menacing new amp that's infused with the percussion, warmth and feel of an all-tube classic while providing double or even triple the output power …and at a fraction of the weight.

Big Block Torque Rules!

Big Block 750 Front Panel

Big Block 750 Front
(Click to Enlarge)

Photo of Big Block 750 Rear Panel

Big Block 750 Rear
(Click to Enlarge)


Big Block 750

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)


Rackmount Bass Amp • 2 Rack Spaces

Big Block 750 Head • Blk Bronco (Standard)

DISCLAIMER: In the interest of continuous improvement, all specifications are subject to change without notice. To guarantee correct fit on custom ordered cases & covers, MESA recommends that customers make personal measurements of their cabinets, after they have been received. MESA provides these measurements as a general reference only, without guarantee or liability.

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