Mesa/Boogie Big Block 750 Owner's Manual
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Mesa/Boogie Big Block 750 Owner's Manual

Mesa/Boogie Big Block 750 Owner's Manual

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Summary of Contents for Mesa/Boogie Big Block 750

  • Page 1 OOGIE Owner's Manual...
  • Page 2 Greetings from the Home of Tone Congratulations on your choice of the Big Block 750 as your Bass amplifier and welcome to the MESA/Boogie family! As a discriminating player you probably know that you have purchased the most comprehensive instrument for amplifying Bass that is available.
  • Page 3 PRECAUTIONS & WARNINGS Your MESA/Boogie Amplifier is a professional instrument. Please treat it with respect and operate it properly. USE COMMON SENSE AND ALWAYS OBSERVE THESE PRECAUTIONS: WARNING: Vacuum tube amplifiers generate heat. To insure proper ventilation always make certain there is at least four inches (100mm) of space behind the rear of the amplifier cabinet.

  • Page 4: Table Of Contents

    Table of Contents Precautions Overview FRONT PANEL: INSTRUMENT INPUT TUNER CONTROLS: OVERDRIVE GAIN BASS PASSIVE MID ACTIVE MID FREQUENCY TREBLE MASTER O.D.MASTER POWER SWITCH REAR PANEL: FUSE A.C. RECEPTACLE GROUND LIFT /POST & PRE / DIRECT OUT: EFFECTS LOOP: Send & Return FOOTSWITCH TUNER SLAVE...

  • Page 5: Overview

    Overview: Congratulations on your choice of the M-PULSE BIG BLOCK 750 as your amplifier and welcome to the MESA/Boogie Family! First we would like to thank you for choosing us as your amplifier company. This is something we never take for granted and you will come to find that we are here to help you sound your best should you ever need help.

  • Page 6: Overview

    That wraps up the Overview, which has covered the controls and features briefly to familiarize you with the power and possibilities of the BIG BLOCK 750. Now let’s get to each of the individual controls and see how they interact to create an individualized sound that is all yours.

  • Page 7: Front Panel

    FRONT PANEL CONTROLS: INPUT: This jack is the instrument INPUT which feeds the first tube in the all-tube preamp of the BIG BLOCK. It is set up with enough headroom to handle both passive and active style instruments. For active instruments you may find yourself running the GAIN control somewhere between 10:00 and 2:00 for optimum headroom.

  • Page 8: Gain

    FRONT PANEL CONTROLS: (Continued) OVERDRIVE: (Continued) Note that the GAIN control is still active when the OVERDRIVE is switched into the signal path. The GAIN control is wired in series with the OVERDRIVE and therefore, it can be used to further fine-tune the amount of overdrive present in the mix.

  • Page 9: Bass

    FRONT PANEL CONTROLS: (Continued) BASS: (Continued) This type of broad band, active rotary control makes it possible to achieve bass characteristics far beyond that of a conventional passive type control. It can increase the low end to an almost absurd level and with a flick of the wrist, dip it to near transitor radio skinniness.

  • Page 10: Frequency

    The MASTER control is the feed to the Simul State power section and determines the overall playing volume of the BIG BLOCK 750. An optimum setting will be determined by the setting of the GAIN control as well as the entire tone control network.

  • Page 11: O.d.master

    POWER SWITCH: This switch delivers the A.C. power to the BIG BLOCK 750. Make sure the unit is grounded (all three terminals of the A.C. power cord must be connected whenever possible to avoid injury to the user as well as to the amplifier). Also, make sure that the proper voltage requirements are present at the A.C.

  • Page 12: Rear Panel

    HANDBUILT IN PETALUMA , CALIFORNIA FUSE: This is the A.C. Mains Fuse for the BIG BLOCK 750. REPLACE ONLY WITH A SLO-BLO TYPE FUSE OF THE PROPER RATING. THIS IS EXTREMELY IMPORTANT, AS THE BIG BLOCK 750 DRAWS A SUBSTANTIAL AMOUNT OF CUR- RENT AT HIGH OUTPUT LEVEL SETTINGS.

  • Page 13: Effects Loop: Send & Return

    The jacks used in the loop are switching-type jacks - meaning that when nothing is inserted into either SEND or RETURN the preamp signal bypasses the jacks. When cables are M-PULSE BIG BLOCK 750 inserted the signal path is interrupted and sent through the EFFECTS LOOP.

  • Page 14: Tuner

    The SLAVE may also be used as a send signal to feed outboard processing racks in a dry/ wet setup where processing is done after the BIG BLOCK 750 and then fed to a Stereo power amplifier for separate control of the wet sound.

  • Page 15: Factory Sample Settings

    FACTORY SAMPLE SETTINGS SAMPLE SET #1: Round Warm R & B E N G I N E E R I N G S I M U L S T A T E B A S S A M P L I F I E R OVERDRIVE O.D.MASTER BASS...

  • Page 16: Personal Settings

    PERSONAL SETTINGS SHEET E N G I N E E R I N G S I M U L S T A T E B A S S A M P L I F I E R OVERDRIVE O.D.MASTER BASS PASSIVE-MID ACTIVE-MID FREQUENCY...

  • Page 17: Diagnosing Preamp Tube Problems

    DIAGNOSING PREAMP TUBE PROBLEMS: At some point it is quite possible that you will experience some kind of minor pre-amp tube noise. Rest assured - this is no cause for alarm and you can take care of the problem yourself in a matter of minutes by simply swapping tubes.

  • Page 18: Parts Sheet

    SWITCH ALL FRONT PANEL KNOBS SAME FRONT VIEW: Big Block 750 600631 408114 part # E N G I N E E R I N G S I M U L S T A T E B A S S A M P L I F I E R OVERDRIVE O.D.MASTER...
  • Page 19 OOGIE The Spirit of Art in Technology Thank you for trusting MESA/Boogie to be your amplifier company and we wish you many years of toneful enjoyment from this handbuilt all tube instrument.
  • Page 20 The Spirit of Art in Technology (707) 778-6565 FAX NO. (707) 765-1503 1317 Ross Street Petaluma, CA 94954...

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