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Owner's Manual


   Summary of Contents for Mesa/Boogie MARK 1 RE-ISSUE

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    OOGIE SSUE Owner's Manual...

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    Hello from the Tone Farm ...You, smart player and all around intuitive human, have put your trust in us to be your amplifier company. This is something we do not take lightly. By purchasing and choosing this unit to be a part of your musical voice, you have become part of the Mesa family...WELCOME! Our goal is to never let you down.

  • Page 3: Table Of Contents

    FRONT PANEL: Precautions Overview Inputs 1 & 2 / Volumes 1 & 2 Treble Bass Middle Toggle Switches 60 / 100 Standby Switch Power / Tweed Switch REAR PANEL: A.C. Receptacle Fuse Ground FX Loop & Level Control Slave Presence Reverb Speaker Jacks Tube Task Chart...

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    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: EU: permission from the Supply Authority is needed before connection. 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.

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    CONGRATULATIONS ! You’ve just become the proud owner of one of the most influential guitar amplifiers ever made - the Boogie MARK 1 ! This is the legendary amp that introduced all of the features most in demand by players today ! The Boogie MARK 1 gave birth to the Multi-Stage High Gain Preamp, the 100/60 or Half Power switch, Direct or Line-Out the Preamp In/Out Jacks (Effects Loop) and Pull Shift functions, too name just a very few.

  • Page 6: Front Panel

    FRONT PANEL: INPUTS 1 & 2 - VOLUMES 1 & 2: These are the instrument Input jacks for the MARK I and their respective Volume Controls. They are not designed for use with two instruments, but rather to access two very different gain stages. INPUT 2 is a relatively normal preamp channel with qualities reminiscent of early Fender “black face”...

  • Page 7: Treble 2, Bass, Middle

    FRONT PANEL: (Continued) BASS: This control determines the amount of low end present in the sound. Unlike most amplifiers, the BASS Control on the MARK I is extremely powerful. Although it is fed by the TREBLE Control and is subject to its settings, the BASS Control is less sensitive to VOLUME 1 VOLUME 2 MASTER...

  • Page 8: Standby Switch

    FRONT PANEL: (Continued) STANDBY SWITCH: The STANDBY switch turns off the high voltages in your Boogie, while allowing it to idle, keeping the tube filaments warm. It should be used during power-up to keep from “shocking” cold power tubes. Simply flip the POWER switch to the ON position while leaving the STANDBY switch in the standby position (toggle down) for about a minute.

  • Page 9: Power / Tweed Switch 4, A.c. Receptacle, Fuse, Ground

    FRONT PANEL: (Continued) POWER / TWEED SWITCH: Continued achieving any tone imaginable! Those players who want that British “crunch” tone can try replacing the output tubes with four European - style EL34 power tubes. Greatly enhanced, shredding top end and the grinding lows so important to a great metal sound result from this tube change.

  • Page 10: Slave

    REAR PANEL: (Continued) EFFECTS LOOP & LEVEL CONTROL: This control and the two adjacent 1/4” jacks comprise the Effects Loop of the MARK I. When Effects devices are connected to the Loop, they are inserted between the pre-amp and the power section and loss of gain and FX LEVEL FX LEVEL FUSE...

  • Page 11: Presence, Reverb, Speaker Jacks

    More descriptions of mismatch combinations can be found in the 60 / 100 switch section of the Front Panel instructions. A Mesa/Boogie 4x12 cabinet comes standard (wired) at 8 Ohms. It has four 8 Ohm speakers wired in series - parallel. No matter how unusual your speaker setup, it is always possible to get good performance.

  • Page 12: Tube Task Chart

    MARK I TUBE TASK CHART Partial View Of Chassis ( View from above - looking down on chassis ) NOTE: Before changing tubes, flip the POWER SWITCH to the off position or to STANDBY. CAUTION: Tubes are HOT when they have been in use. 12AT7 12AX7 GRAY...

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    TUBE MAINTENANCE & MICROPHONICS: You may occasionally experience some form of tube noise or microphonics. Certainly no cause for alarm, this quirky behavior comes with the territory and the Tone. Much like changing a light bulb, you don’t need a technician to cure these types of minor user serviceable annoyances and in fact, you’ll be amazed at how easy it is to cure tube problems...by simply swapping out a pre-amp or power tube! First may we suggest that you set the amplifier up on something so that you can get to the tubes comfortably without having to bend...

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    DIAGNOSING PRE AMP TUBE PROBLEMS: Because your amplifier is an all tube design, it is quite possible that you will at some point experience 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 Let us begin by saying;...

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    SPEAKER IMPEDANCE MATCHING & HOOK-UP GUIDE: IMPEDANCE: Wiring up speakers to provide the most effective load and making sure that all of them are in phase will help in creating the best sound possible. This is not too difficult, as long as you understand a few things about loading and how to connect your speakers to provide an optimal resistive load.

  • Page 17: Speaker A Speaker B

    SPEAKER IMPEDANCE MATCHING & HOOK-UP GUIDE: (Continued) PARALLEL: When wiring in parallel, the resistance of the speakers decreases. Two 8 ohm speakers wired in ( hooked-up ) Parallel results in a 4 ohm load. It’s easy to calculate the effect of a resistive load when all the speakers are all the same resistance. It is really not suggested to wire different resistive load values in Parallel ( 8 and 4, 16 and 8 etc.

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    WIRING SCHEMES...Amplifier to Speaker Cabinets Partial back view of amplifier 8 OHM 4 OHM 4 OHM 8 Ohm Cabinet 8 Ohm Cabinet 4 Ohm Cabinet Partial back view of amplifier 4 OHM 8 OHM 16 OHM 16 Ohm Cabinet Partial back view of some Mesa amp 8 OHM 4 OHM...

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    WIRING SCHEMES...Amplifier to Speaker Cabinets Partial back view of amplifier 8 OHM 4 OHM 8 Ohm Cabinet CORRECT MATCH Partial back view of amplifier 8 OHM 4 OHM 8 Ohm SERIES BOX 4 Ohm 4 Ohm 4 Ohm Cabinet 4 OHM 8 Ohm Cabinet 8 Ohm Cabinet 4 OHM...

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    WIRING SCHEMES...Amplifier to Speaker Cabinets Partial back view of amplifier 16 Ohm 4 OHM 4 OHM 8 OHM SERIES BOX 8 Ohm 8 Ohm 8 Ohm Cabinet 8 Ohm Cabinet 8 Ohm Cabinet SAFE MISMATCH Partial back view of amp Partial back view of amplifier CORRECT MATCH 8 OHM...

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    WIRING SCHEMES...Amplifier to Speaker Cabinets Partial back view of amplifier 16 Ohm 4 OHM 4 OHM 8 OHM SERIES BOX 8 Ohm 8 Ohm 8 Ohm Cabinet 8 Ohm Cabinet 16 Ohm Cabinet SAFE MISMATCH Partial back view of amplifier 8 OHM 4 OHM 4 OHM...

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    BIAS ADJUSTMENT: ( A continuing series...) NOTE: An article written by Randall Smith that we thought you might find interesting. Here’s a question we often hear: “Why doesn’t Mesa put bias adjustments in their amplifiers?” Well, there’s a short answer and a long answer to this question. The short answer is that during my 12 years of repairing Fenders, one of the most frequent problems I saw was bias controls that were either set wrong or that had wandered out of adjustment due to vibration.

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    BIAS ADJUSTMENT: (Continued) When you set the bias (whether it’s by selecting the right resistors, as we do, or adjusting a trimmer — which is quicker) what you are doing is establishing the correct amount of idle CURRENT that flows through the power tubes. But you can’t adjust the current directly, you can only change it by adjusting the amount of bias VOLTAGE that goes onto the tubes’...

  • Page 24

    How much money and trouble that has saved Mesa/Boogie players you couldn’t estimate. Our rigorously tested and hand selected tubes are available at your nearest Mesa/Boogie Pro Center or from us directly. Nobody offers better price, quality or warranty than we do ... so why swerve? Next time we’ll talk about our part in developing the great Sylvania STR 415 type 6L6 and how we’re on the verge of seeing something...

  • Page 25

    ON TRIODES, PENTODES & IRISHMENN With apologies to Friends and Relatives from the Emerald Isle - who will make their appearance soon enough - the humor which follows is dedicated to the memories of Spec McAuliff and Fae (Rafael) McNally, two of the True Greats. As their numerical references suggest, the terms Diode, Triode and Pentode indicate the number of elements within the vacuum tube i.e.

  • Page 26

    ON TRIODES, PENTODES & IRISHMENT: (Continued) Thus a diode tube - one with a cathode and an anode - is mostly used to rectify alternating current into direct current by passing it without restriction, but in one direction only. This also explains why closing time is stricly enforced at Irish pubs: During normal operation, the traffic flow is similarily unimpeded and uni-directional toward the bar and this process rectifies the work-day negativity.

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    PENTODES: (Continued) stopping them. The influence of the plate takes over and - being solid metal and of the highest positive attraction - it is at this final destination that the electrons congregate. Thus the proper cocktail waitress - visible through the louvers - is scantily clad so as to be all the more effective at reinforcing the attractive influence of her bar and by being located in between the door and the bar, she serves as bait to lure customers past the door’s negative influence.

  • Page 28

    ARK I Front View 610130 JACK pt# POT pt# POT pt# POT pt# 591047 591047 591047 VOLUME 1 VOLUME 2 MASTER KNOB pt# (all knobs) 610110 JACK pt# ARK I Rear View 790342 FUSE HOLDER pt# KNOB 3A SLO FUSE pt# FX LEVEL FUSE GRND...

  • Page 29

    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.

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    The Spirit of Art in Technology (707) 778-6565 FAX NO. (707) 765-1503 1317 Ross Street Petaluma, CA 94954...

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