Mesa Walk About Bass Amplifier User Manual

OOGIE
B
M
ESA
Owner's Manual
Greetings from the Home of Tone
most comprehensive instrument for amplifying Bass that is available. What you might not realize is that this entitles you to all the experience, resources and commitment our twenty-five years of service to musicians world wide has to offer. Our responsibility is to help you sound great! So, if at any time you feel you need help or direction, we are here for you...a phone call away.
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:
READ AND FOLLOW INSTRUCTIONS OF PROPER USAGE.
YOUR AMPLIFIER IS LOUD! EXPOSURE TO HIGH SOUND VOLUMES MAY CAUSE PERMANENT HEARING DAMAGE !
No user serviceable parts inside. Refer service to qualified personnel. Always unplug AC power before removing chassis.
EXPORT MODELS: Always insure that unit is wired for proper voltage. Make certain grounding conforms with local standards.
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. Keep away from curtains or any flammable objects.
WARNING: Do not block any ventilation openings on the rear or top of the amplifier. Do not
impede ventilation by placing objects on top of the amplifier which extend past the rear edge of its cabinet.
WARNING: Do not expose the amplifier to rain, moisture, dripping or splashing water. Do not
place objects filled with liquids on or nearby the amplifier.
WARNING: Always make certain proper load is connected before operating the amplifier.
Failure to do so could pose a shock hazard and may result in damage to the amplifier.
Do not expose amplifier to direct sunlight or extremely high temperatures.
Always insure that amplifier is properly grounded. Always unplug AC power cord before changing fuse or any tubes. When replacing fuse, use only same type and rating.
Avoid direct contact with heated tubes.
Keep amplifier away from children.
Be sure to connect to an AC power supply that meets the power supply specifications listed on the rear of the unit. Remove the power plug from the AC mains socket if the unit is to be stored for an extended period of time. 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. Do not use solvents such as benzene or paint thinner to clean the unit. Wipe off the exterior with soft cloth.
FRONT PANEL:
REAR PANEL:
Precautions 0 Overview 1/2
Instant Gratification
2
Helpful Hints 2/3
Instrument Inputs: ACTIVE & PASSIVE 3
CONTROLS: GAIN 4 BASS 4 MID 5 TREBLE 5 DI LEVEL 6 MASTER 6 PARAMETRIC EQUALIZER 6/7 FREQUENCY CONTROLS 7
FUSE 8 A.C. RECEPTACLE 8 DIRECT OUT: Ground Lift - XLR Jack 9 EFFECTS LOOP: Send & Return 9 SPEAKER OUTPUT
9
FACTORY SAMPLE SETTINGS 10 PERSONAL SETTINGS PAGE 11/12 TUBE NOISE and DIAGNOSING PRE-AMP TUBE PROBLEMS 13 PARTS SHEET 14
Table of Contents
14
OVERVIEW:
M-Pulse
360
WalkAbout
Operating Instructions
CAUTION
:
Unplug power
before
removing fuse or
bolts
holding chassis
POWER FUSE
6A SLO BLO
120 V~
60 Hz
6 A
F
U
S
E
F
U
S
E
GROUND
LIFT
DIRECT OUTPUT
EFFECTS LOOP
SPEAKER OUTPUT
SUGGESTED LOAD
RETURN SEND
4 OHMS
REAR VIEW: WalkAbout
SIMUL STATE BASS AMPLIFIER TUBE DRIVEN-MOSFET POWER
HANDBUILT IN PETALUMA , CALIFORNIA
M-PULSE TM WALKABOUT
OVERVIEW: (Continued)
Connect your A.C. Power Cable to a grounded outlet. Avoid ground lifts (3 to 2 prong adapter) whenever possible.
You may use a cabinet (s) of a higher rating safely (8 Ohm) with
and from the
Instrument
shelving type controls with a broad response even though they are acting primarily on
HELPFUL HINTS:
(Continued)
By using this technique you will keep noise to a minimum and ensure ample headroom at all times. The Parametric
When using Outboard Signal Processors, the best results are usually found by inserting them into the Effects Loop which provides
The
circuit provides a GROUND LIFT that disconnects chassis ground from circuit ground. Should you encounter
chassis to circuit ground will remedy the situation.
WalkAbout
and you are well on your way to having the
FRONT PANEL: CONTROLS & FEATURES
These are the Instrument Input jacks and between them you can match the signal
Input should be used whenever instruments that utilize
Input for conventional passive instruments also, for heavy handed
Input is set up for more conventional basses with passive pickups that produce lower output signal levels. This jack is
INSTRUMENT
INPUTS
PASSIVE
ACTIVE
INSTRUMENT
INPUTS
PASSIVE
ACTIVE
INSTRUMENT INPUTS: ACTIVE / PASSIVE
FRONT PANEL CONTROLS:
(Continued)
GAIN:
This control determines the overall character of the input sensitivity. The lower regions of the control (below 12:00) lend
This control is responsible for the basic mix of low frequencies in the tube pre-amp. As mentioned earlier in the Helpful Hints
control is an active shelving type as opposed to a passive style control. This means that a center Q point has been
control is actually a gain and frequency control all rolled into one with the Q
of -20db
control.
INSTRUMENT
INPUTS
PASSIVE
ACTIVE
GAIN BASS
FOUR - STAGE VACUUM TUBE
INSTRUMENT
INPUTS
PASSIVE
ACTIVE
GAIN BASS
FOUR - STAGE VACUUM
BASS:
FRONT PANEL CONTROLS:
(Continued)
MID:
This is the only passive style control in the string of rotary tone controls. This scheme was chosen for its inherently musical
and while it can competently remove this broad
The
is also an active shelving style control like that found in the BASS and again, it was chosen for its ability to
control.
remains constant until the
case, almost more so, because higher frequencies seem louder to the ear and are generally more painful when set
ON
POWER
TREBLE DI LEVEL MASTER
INSTRUMENT
INPUTS
PASSIVE
ACTIVE
GAIN BASS MID
FOUR - STAGE VACUUM TUBE PREAMPLIFIER
TREBLE:
FRONT PANEL CONTROLS:
(Continued)
DI LEVEL:
This rotary control determines the amount of signal present at the Rear Panel DIRECT OUT XLR jack. You will fi nd
with the
control Zeroed out, to avoid damaging the console, speakers
This basic control determines the overall fi nal output level of your
so that you can adjust the front end GAIN
power section to the desired listening level.
output level control with care. The
is capable of very
output
Your
is equipped with a powerful in-line
that
is an in-line type,
will pass the
These
controls adjust the amount of whatever frequency has been zeroed-in on for
control radically and then sweep for the
controls, it is possible to very quickly go beyond the
ON
POWER
DI LEVEL MASTER
ON
POWER
DI LEVEL MASTER
0 db 0 0
60 Hz 340Hz 2K
PARAMETRIC EQUALIZER
30 300 200 2K 1.2K 12K
-15 + - + - +15
MASTER:
PARAMETRIC EQUALIZER:
GAIN:
PARAMETRIC EQUALIZER: (Continued)
controls and then begin with subtle tweaking of the frequencies using the
Hangover is part of the buzz. Don’t be surprised if after tweaking
control, than boosting desirable frequencies. In this way your
These 3 rotary controls divide up the frequency spectrum into three sweepable Q bands that allow
M-PULSE 600
and
360
certainly doesn’t suffer from its 3 Band SEMI-PARAMETRIC EQ simplicity.
control settings within the
to fi ne-tune your sound with subtle adjustments. Much like a car
incorporates this shaping device capable of ruining a great tone in the
FRONT PANEL CONTROLS:
(Continued)
0 db 0 0
60 Hz 340Hz 2K
PARAMETRIC EQUALIZER
30 300 200 2K 1.2K 12K
-15 + - + - +15
FREQUENCY CONTROLS:
REAR PANEL CONTROLS:
FUSE:
This is the A.C. Mains Fuse for the
The removable “Euro” Style” A.C. cord that is supplied with the
NOTE: NEVER ALTER THE THREE PRONG POWER CORD IN ANY WAY.
NOTE:
POWER FUSE
12A SLO BLO
120 V~
60 Hz 12 A
F
U
S
E
F
U
S
E
POWER FUSE
12A SLO BLO
120 V~
60 Hz
12 A
F
U
S
E
F
U
S
E
CAUTION
:
Unplug power before removing fuse or bolts holding chassi
s
WARNING
:
To reduce risk of fire or
electric shock, replace
fuse with
same
type and rating only. Do not
expose this unit to rain or moisture.
WARNING
:
To reduce risk of fire or electric
shock,
Do not remove cover. No user­serviceable parts inside. Refer servicing to qualified personnel.
M-PULSE TM SIMUL STATE BASS AMPLIFIER
TUBE DRIVEN-MOSFET POWER
HANDBUILT IN PETALUMA, CALIFORNIA
CAUTION: NEVER BLOCK AIR VENTS
CAUTION: NEVER BLOCK AIR VENTS
CAUTION:Unplug power
before
removing fuse or
bolts
holding chassis
F
U
S
E
F
U
S
E
CAUTION
:Unplug power
before
removing fuse or
bolts
holding chassis
POWER FUSE
6A SLO BLO
120 V~
60 Hz
6 A
F
U
S
E
F
U
S
E
GROUND
LIFT
DIRECT OUTPUT
EFFECTS LOOP
SPEAKER OUTPUT
SUGGESTED LOAD
RETURN SEND
4 OHMS
REAR VIEW: WalkAbout
SIMUL STATE BASS AMPLIFIER TUBE DRIVEN-MOSFET POWER
HANDBUILT IN PETALUMA , CALIFORNIA
M-PULSE TM WALKABOUT
A.C. RECEPTACLE:
REAR PANEL CONTROLS:
(Continued
DIRECT OUT:
This section captures the entire pre-amp signal including the SEMI-PARAMETRIC EQ and the EFFECTS LOOP
a male XLR jack,
a GROUND LIFT switch.
This switch removes the circuit-to-chassis ground connection from the XLR jack. Leave
The
section of the
jacks located on the Rear Panel.
circuitry can be completely removed from the signal path with
mini toggle. This removes all associated loop circuitry from the chain and ensures
This is the patch point between the pre-amp and power amp for returning a processed signal from
jack can be used to access the power amp only. This is handy to use the
units are connected for large venue applications.
This is the output of the pre-amp and allows you to send a signal to your effects for processing.
The
is 4 Ohms, at which the mighty
EFFECTS LOOP
RETURN SEND
SPEAKER OUTPUT
SUGGESTED LOAD
4 OHMS
DIRECT OUT
GROUND
LIFT
EFFECTS LOOP:
SPEAKER OUTPUT:
DIAGNOSING PRE-AMP TUBE PROBLEMS:
You may occasionally experience some form of tube noise or microphonics. Cer-
If they are hot and you
TUBE NOISE & MICROPHONICS:
CAUTION
:
Unplug power before removing fuse or bolt
s holding chassis
POWER FUSE
6A SLO BLO
120 V~
60 Hz
6 A
F
U
S
E
F
U
S
E
GROUND
LIFT
DIRECT OUTPUT
EFFECTS LOOP
SPEAKER OUTPUT
SUGGESTED LOAD
RETURN SEND
4 OHMS
SIMUL STATE BASS AMPLIFIER TUBE DRIVEN-MOSFET POWER
HANDBUILT IN PETALUMA , CALIFORNIA
M-PULSE
TM
WALKABOUT
INSTRUMENT
INPUTS
PASSIVE
ACTIVE
ON
POWER
GAIN BASS MID
0 db 0 0
60 Hz 340Hz 2K
PARAMETRIC EQUALIZER
30 300 200 2K 1.2K 12K
-15 + - + - +15
TREBLE DI LEVEL MASTER
FRONT VIEW: WalkAbout
JACK pt#
JACK pt#
ALL FRONT PANEL KNOBS SAME
part #
POT pt#
POT pt#
POT pt#
POT pt#
POT pt# POT pt#
POT pt#
POT pt# POT pt#
POT pt#
POT pt#
POT pt#
SWITCH pt#
LEN pt#
BULB pt#
REAR VIEW: WalkAbout
FUSE CAP pt#
JACK pt#
FUSE pt#
SWITCH pt#
JACK pt#
JACK pt#
JACK pt#
JACK pt#
618356
618356
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593151
593737
593151
593151
593151
602110
70304
7
703782
408114
593379
593379 593379
592155
592155 592155
790347
790625
620550
607101
618356
61835
6
618356
618356
The Spirit of Art in Technology
OOGIE
B
M
ESA
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.
The Spirit of Art in Technology
1317 Ross Street Petaluma, CA 94954
USA
(707) 778-6565 FAX NO. (707) 765-1503
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