Mesa Boogie V Twin Users Manual

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Owner's Manual

OOGIE

B

MESA

1317 Ross Street Petaluma, CA 94954

USA

The Spirit of Art in Technology

PAGE SIZE 7 wide X 9 1/2high

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. Our reward is that we've made a classic pre-amplifier and

by choosing this wonderful unit, you have become part of the MESA

family...WELCOME! Our goal is to never let you down. Your reward

is that you are now the owner of an archetypal guitar pre-amp, bred of

fine all tube amp heritage...benefiting from the many pioneering and

patented MESA circuits that led to the refinement of your new

instrument. Feel confident, as we do, this amp will inspire many hours

of musical satisfaction and lasting enjoyment. It was built with you in

mind, by players who know the value of a fine musical instrument and

the commitment it takes to make great music. The same commitment to

quality, value and support we make to you...our new friend.

PRECAUTIONSPRECAUTIONS

ALL OF THE OUTPUTS WHEN CONNECTED TO THEIR RESPECTIVE

SOURCES ARE CAPABLE OF PRODUCING VERY LOUD SOUND

LEVELS AND EXPOSURE TO THESE HIGH VOLUMES MAY CAUSE

THE USER PERMANENT HEARING DAMAGE.

No user serviceable parts inside. Refer service to qualified personnel. Always unplug

AC power before removing chassis.

READ AND FOLLOW INSTRUCTIONS OF PROPER USAGE.

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:

Do not expose amplifier to moisture, rain or water, direct sunlight

or extremely high temperatures.

Always insure that amplifier is properly grounded.

Always unplug AC power cord before changing tubes.

Avoid direct contact with heated tubes.

Insure adequate air circulation around this pre-amp.

Keep amplifier away from children.

Do not throw or drop amplifier, especially on living beings.

Be sure to connect to an AC power supply that meets the power

supply specifications listed on the rear of the unit.

If there is any danger of lightning occurring nearby, remove the

power plug from the wall socket in advance.

To avoid damaging your speakers and other playback equipment,

turn off the power of all related equipment before making the

connections.

Do not use excessive force in handling control buttons, switches

and controls.

Remove the power plug from the AC mains socket if the unit is to

be stored for an extended period of time.

Do not use solvents such as benzene or paint thinner to clean the

unit. Wipe off the exterior with soft cloth.

Be sure to have the warranty card for this product filled out by the

store at which it was purchased and return to MESA Engineering.

PRECAUTIONSPRECAUTIONS

Congratulations on your purchase of the V-TWIN! This handbuilt, all tube, 3 mode pre-

amp combines all the features and versatility found in our trademark pre-amplifiers and offers them up in a

compact and rugged floor format. Historically, floor pre-amplifiers have been used primarily to add or

enhance gain and flexibility to existing stand alone combos or heads. V-TWIN does this extremely well,

offering three sounds, two of them footswitchable and can create tone that will surely rival, if not shame all

but the most diligently tweaked contenders. However, V-TWIN does not stop here! A full blown pre-amp, V-

TWIN goes on to become an ingenious and innovative brain to any rack system by providing an optimized

output for interfacing with power amps. To complete its arsenal, V-TWIN packs a high caliber recording

circuit that appears in the form of the Mixer/Headphone jack. This studio helper makes direct to tape

recording a breeze, minimizing set up time and the many hours normally spent on microphone placement

and cabinet swaps.

And finally, the best feature of all...the V-TWIN will fit into just about any standard size gig or accesory bag

that you would normally store your cords and other related tools of the trade in. This compact format allows

you amazing tone wherever you may roam. The ultimate spare rig, sit - in - savior or personal headphone

stack...V-TWIN provides many possible ways to enjoy your playing a whole lot more!

V TWIN

Connect the desired output to its intended source using shielded

cable of the shortest convenient length available. The three choices are:

CHOOSING A SOURCE OUTPUT:

MIXER /

INPUT

FOOT

SWITCH

VOLUME MASTER LEAD MASTER TREBLE BASS MIDDLE REVERB PRESENCE STUDIO 22+

STANDBY

ON

POWER

ON

HEADPHONES TO POWER

AMP TO GUITAR

AMP

MIXER

123456

PAGE 1

Connect the 12 volt power supply adapter to the jack located in the center on the rear panel

of unit.

POWER UP:

12VAC - 1 AMP

50 / 60 Hz

POWER SUPPLY

AC - 1 ONLY

HANDBUILT IN PETALUMA, CA, USA

OOGIE

B

MESA

EXTERNAL

SELECT EXTERNAL

BYPASS INSTRUMENT

INPUT

TO POWER

AMP TO GUITAR

AMP

MIXER /

HEADPHONES

STEREO SIMUL CLASS 2 : NINETY

LEVEL A LEVEL B

MESA

MESA

BASIC SET-UP:

Set the controls as per this diagram. Then run through the 3 sounds by using the

Channel Select footswitch and the Alternate Channel push key located between the Middle and Treble

controls.

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

ALTERNATE CHANNEL

BLUES

CLEAN SOLO

BYPASS

BYPASS CHANNEL

However, the Normal configuration works great if you need an alternate clean sound of a different level and

tone. The Normal position can also work great for driving an amplifier's front end stage into clip by using the

Clean mode and setting V-TWIN'S Gain control high and switching it in for the pushed rhythm sound or a

lower gain Solo sound.

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

ALTERNATE CHANNEL

BLUES

CLEAN SOLO

BYPASS

BYPASS CHANNEL

LED BYPASS

LIGHT ON

USE TO SELECT THE

BYPASS MODE... USE TO SELECT THE

BLUES / SOLO MODES

LED WILL LIGHT

BLUE OR RED

INPUT

FOOT

SWITCH

VOLUME MASTER LEAD MASTER TREBLE BASS MIDDLE REVERB PRESENCE STUDIO 22+

STANDBY

ON

POWER

ON

JACK

LOCATED ON

BACK PANEL

OF V-TWIN

TO GUITAR

AMP

This jack is provided to allow interfacing with existing amplifiers, giving the user an

additional three sounds (two are footswitchable) and thus

expanding the potential of virtually any amp. You will find the

inherent quality of V-TWIN'S voices to be a nice addition to even

the coolest circuits. When using this jack the V-TWIN can be set

up two different ways: Normal = Footswitchable from Clean

to Solo, or Alternate = Footswitchable from Blues to Solo.

In most situations using an existing amplifier that has a clean

channel - one would choose the Alternate configuration.

In this set-up you would use the host amplifier's clean sound

having V-TWIN in Bypass (LED on) and activate V-TWIN for two

different soloing sounds...Blues or Solo. See illustration below.

1

TO GUITAR AMP:

2

AND USE THE HOST AMPS

CLEAN SOUND.

()

PAGE 2

OUTPUTS:

MESA

TO POWER AMP:

This jack provides a hotter signal level and a slightly different E.Q. curve for

interfacing with the FX Return stage of any amplifier, or

simply to use V-TWIN as a stand alone pre-amp with an

existing power amplifier. (We suggest an all tube power

amp...e.g. MESA'S Stereo Simul-Class 2 : Ninety or

Fifty / Fifty.)

The level here should be more than enough to drive even

much less sensitive Non-MESA amplifiers.

JACK

LOCATED ON

BACK PANEL

OF V-TWIN

TO POWER

AMP

MIXER / HEADPHONES:

TO MIXER /

HEADPHONES

JACK

LOCATED ON

BACK PANEL

This 1/4" output and its accompanying switch ( located on the side panel )

support V-TWIN's recording circuit. This circuit is voiced to re-create the

sounds you're accustomed to hearing from the "To Guitar Amp" and "To

Power Amp" outputs. With the Record circuit mode switch

set to "MIXER," the output level is optimized for console

input stages (with all controls set at 12' o clock = +10 db.)

This should be more than adequate for most all direct

applications, allowing adjustment in either direction. Use

the Master control to vary the level at this output.

MIXER

CH3 CH4 CH5 CH6 CH7 CH8

When the rocker switch is set to "Headphones," the output level remains constant, but the tip is connected

to ring internally on the jack making stereo phoning possible. Use the Master to adjust the listening level.

Keep in mind the type and quality of headphones greatly affect the performance of this circuit, with the fully

enclosed, studio quality type producing the best results.

V-TWIN can be controlled by an external switching source to select between

two of the three modes. This can be most any tip to ground type switch logic. This feature makes possible

the inclusion of V-TWIN into programmable rigs or multiple pre-amp rigs where the units within are

controlled by a programmable switcher.

NOTE: V-TWIN must remain in the power-up switch logic to be controlled via this jack. In other

words...every time you get ready to use the unit in an External Select situation, remove the A.C. adaptor and

plug it back in without choosing any modes...Leave it alone. This procedure clears the switching logic

leaving the circuit in the receive-ready state and awaiting commands from the external switching device.

EXTERNAL SELECT:

The Bypass function may also be triggered by an external switching device.

This logic is controlled via a standard tip to ground type switch. This jack performs the same function as the

footswitch located on the face of the unit. It is wise to use the same power-up procedure as when using the

External Select to clear the switching logic.

EXTERNAL BYPASS:

PAGE 3

When the Bypass Footswitch is selected (and

the LED goes out,) all sound is muted at this output.

NOTE:

CONTROL JACKS:

STEREO SIMUL CLASS 2 : NINETY

LEVEL A LEVEL B

MESA

Now that you have a better understanding of the Outputs and set-up procedures,

let's listen to a few sample settings...Keep in mind that if you are using the TO GUITAR AMP jack, the

setting of the host amp determines much of the overall character of the sound. We suggest you start by

plugging into the host amplifier first and dialing up a balanced and warm clean rhythm sound. Watch out for

excessive highs or lows, as an over abundance of either of these frequencies can make it difficult to create

a great lead sound.

SPARKLING CLEAN: CLEAN MODE:

Neck Single / All 3 Singles

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

1

(continued on page 5)

PAGE 4

SAMPLE SETTINGS:

PUSHED RHYTHM / BLUES SOLO: CLEAN MODE:

Neck Single

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

2

PURRING BLUES : BLUES MODE:

Neck Single

3GAIN BASS MIDDLE TREBLE PRESENCE MASTER

HINT: It is possible to alter the gain structure of all three modes in V-TWIN by simply replacing

one or both 12AX7 tubes housed under the shielding cage with 12AT7 tubes. This will reduce the

amount of gain fairly substantially without compromising the V-TWIN's overall voice. Make sure the

unit has not been in use just prior to this simple user mod as hot pre-amp tubes can cause severe

burns.

SUGGESTED SAMPLE SETTINGS

PAGE 5

(continued)

SAMPLE SETTINGS:

These settings are mere suggestions that should get you in the ball park so to speak...taking into

account pick-up differences and host amp / power amplifier variables. Spend time with the controls as they

interact with each other a great deal and sometimes the frequencies you wish to adjust lie in more than one

control i.e. to adjust high "cut" work with upper regions of the Mid control, as well as the Treble and

Presence controls. To soften the sound reduce Mid while increasing Bass. With some time well spent,

you'll find so many great sounds...you'll think V-TWIN was and is, the deal of the century.

HINTS

JUICY HIGH GAIN LEAD: SOLO MODE:

Bridge Humbucking

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

6

STINGING BLUES: BLUES MODE:

Neck or Bridge Single

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

4

CRUNCH RHYTHM: SOLO MODE:

Bridge Humbucking

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

5

GAIN BASS MIDDLE TREBLE PRESENCE MASTER

ALTERNATE CHANNEL

BLUES

CLEAN SOLO

BYPASS

BYPASS CHANNEL

MIXER /

HEADPHONES TO POWER

AMP EXTERNAL

SELECT EXTERNAL

BYPASS

12VAC - 1 AMP

50 / 60 Hz

POWER SUPPLY

AC - 1 ONLY

TO GUITAR

AMP INSTRUMENT

INPUT

MESA OOGIE

BR

HAND BUILT IN PETALUMA, CA, USA

V-TWIN Rear View

V-TWIN Front View

JACKS pt# (all)

JACKS pt# (all) JACK pt#

POT pt# POT pt# POT pt# POT pt# POT pt# POT pt# KNOBS pt# (all)

LED LIGHT (red) pt#

LED LIGHT (blue) pt#

SWITCH pt# SWITCH pt#

THUMB SCREW L & R pt#

MIXER PHONES

NOTE: This switch

is located on the

right side of the unit

pt#

R

L

612391

618112

JACK pt#

612712 618112

601901

408110

395439

395753

LED HOLDER

pt# (all) 395755

600400

600400

LED LIGHT (green) pt#

LED LIGHT (red) pt#

395438

395753

CAP pt#

SHAFT pt#

PLUNGER pt#

600203

600201

600202

302063

594737 594739 594737 594149 594739 594378

Thank you for trusting MESA/Boogie to be your amplifier

company. We wish you many years of toneful enjoyment from this

handbuilt all tube instrument.

The Spirit of Art in Technology

OOGIE

B

MESA