Mesa/Boogie Three Channel Dual & Triple Rectifier Solo... User manual

OOGIE
B
MESA
Owner's Manual

Hello from the Tone Farm
...You, smart player and intuitive human, have put your trust in us to be your amplifier
company. This is something we do not take lightly. By choosing this instrument 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. Your reward is that you are the new owner of an amp,
bred of fine all tube heritage...benefiting from the many pioneering and patented Mesa
circuits that led to the refinement of your new model. We feel confident, 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.

Table of Contents
Precautions
Overview & Instant Gratification _________________________________________________________ 1-3
Helpful Hints _________________________________________________________________________ 4
THE MODES:
Channel 1: Fat Clean / Tite Clean / Crunch _________________________________________________ 4-5
Channel 2: Crunch / Tite Clean / Fluid Drive _______________________________________________ 6
FRONT PANEL CONTROLS & SWITCHES:
Gain, Treble / Mid / Bass ________________________________________________________________ 7-8
Presence / Master _____________________________________________________________________ 9
Rectifier Select: Diodes / Tube Rectifier ___________________________________________________ 9
Channel Select ________________________________________________________________________ 10
Output Control ________________________________________________________________________ 10
Solo Control __________________________________________________________________________ 10
Standby _____________________________________________________________________________ 11
Power: ON / OFF / SPONGY _____________________________________________________________ 11
REAR PANEL CONTROLS, SWITCHES & JACKS
Slave ________________________________________________________________________________ 11-12
Speakers _____________________________________________________________________________ 12
Channel Solo: External Switch Ports _____________________________________________________ 12
FX Loop _____________________________________________________________________________ 12-13
FX Return As A Power Amp Input ________________________________________________________ 13-14
AC Receptacle ________________________________________________________________________ 14
Fuse ________________________________________________________________________________ 14
Serial Number ________________________________________________________________________ 14
Factory Sample Settings ________________________________________________________________ 16-17
Personal Settings Page _________________________________________________________________ 18
Tube Noise & Microphonics _____________________________________________________________ 19
Diagnosing Power Tube Failure __________________________________________________________ 19
Diagnosing Pre Amp Tube Failure ________________________________________________________ 20
Speaker Impedance Matching & Hook-up Guide ____________________________________________ 21-26
Bias Adjustment: A feature article by Randall Smith ________________________________________ 27-29
Triodes, Pentodes & Irishmen: A feature article by Randall Smith ______________________________ 30-32
Tube Task Chart _______________________________________________________________________ 33
Part Sheet ____________________________________________________________________________ 34

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:
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.
READ AND FOLLOW INSTRUCTIONS OF PROPER USAGE.
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.

PAGE 1
Overview:
Congratulations on your choice of the ACE as your amplifier and welcome to the MESA/Boogie Family!
This design represents our experience gained over the last several decades hand-building all-tube, high performance amplifiers and
showcases ultimate tone and versatility served up with intuitive simplicity.
We wish you many years of inspired enjoyment from your new instrument and feel confident that it will exceed your expectations right
away. And as your musical journey unfolds, so will your ACE, proving its lasting value as it supports your musical growth for years
to come.
While the Stilettos arethe first amplifier in the MESA Family that features exclusively the EL34 type power tube, it is no less endowed
with the patented features and refinements than its MESA siblings utilizing 6L6 type pentodes for power production. Years of scrutiny
and testing of the available ‘34‘s was incorporated into the long process of R&D to ensure reliable performance while we were extract-
ing our measure of this revered tubes’ golden elixir of harmonic bliss.
The ACE delivers all the vintage voodoo power-clip characteristics of the best classic British EL34 amps, and yet goes far beyond
those gems in terms of gain, expression, nuance and flexibility to put a new standard in place in the realm of EL Based circuits.
We begin with the straightforward 2 Channel platform that presents everything in a one glance, confidence inspiring visual tour of the
Front Panel. All the controls you need and nothing more. A closer look reveals two sets of mini toggles adjacent to the input GAIN
Control, one 3 position for each Channel, responsible for choosing one of 5 incredible Modes (CRUNCH appears in both channels).
REAR PANEL : Stiletto ACE
FRONT PANEL : Stiletto ACE
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLE
MID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
LEVEL OUT
4 OHM 4 OHM 8 OHM 8 OHM CHANNEL SOLO
EXT
SW
RETURN SEND
SEND LEVEL
WARNING: Unplug power
before replacing fuse or
removing bolts mounting
chassis
POWER FUSE
120 V~
60 Hz
4 A
4 A
SLO
BLO
FX LOOP
SPEAKER
T
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T
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E
C
L
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G
A
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SLAVE
LOOP IN
HARD BYPASS
F
U
S
E
LOOP NOTE:
First set sound with LOOP
BYPASSED. Then set SEND
LEVEL and OUTPUT to 50%
for unity gain. With LOOP IN,
adjust SEND to match FX.
Use OUTPUT for RETURN
level & live volume.
STILETTO
AC E
ALL TUBE
AMPLIFIER
H ANDBUILT IN PETALUMA, CALIFORNIA
®
®
NORMAL
Instruction Manual

PAGE 2
Overview: (Continued)
The Preamp MODES: In Channel 1 the choices are grouped in reference to gain regions
usually associated with Rhythm styles; FAT CLEAN, TITE CLEAN and CRUNCH.
CHANNEL 1
The beauty of FAT CLEAN re-educates EL aficionados used to living with clean “inputs” that are no more than
upstream patch points. Satisfactory, though un-inspiring, we choose to switch in an entire clean-optimized preamp dedicated to spar-
kling highs, sweet mids and breathing lows. The FAT CLEAN mode invites a refreshing, re-defining look
at the expectations of clean sounds in this genre of amplifier.
The more stripped TITE CLEAN mode trims away some of this low end response and leaves you with
an urgent voice where mids and highs dominate and lows support. This difference is perfect when darker
mahogany guitars are in use or, in the studio when you need a part to sit in a mix without occupying
too much space.
From here gain is increased dramatically to produce CRUNCH, an essential, quintessential mode which delivers the spectrum from
classic Brit break-up, through tight Southern Crunch and eventually to a classic So. Cal. Grind. This mode is so flexible and it’s gain
region so inherently right for so many styles, that we repeated it as an option in Channel 2.
CHANNEL 2
This channel begins its odyssey into the realm of gain hellacious with an ingenious, yet common sense duplication
of the CRUNCH mode found in Channel 1. This scheme proves invaluable, as this versatile mode tops-out at the onset of saturation,
offering up a wide and usable range of medium gain. Not just great for rhythm playing, CRUNCH reveals a whole world of articulate,
earthy solo sounds that leave the vintage or modified circuits seeming inadequate, if not overpriced.
Next, the TITE GAIN mode steps into the MESA frontier of lead voices with a new and blistering rendi-
tion of the classic Brit sound that has been fortified with additional gain and classic Boogie focus. This
new sound adds a searing harmonic blade to the mid-focused, chest thumping hit so prevalent in the
U.K. based circuits and creates an addicting-to-play solo voice that stands proud alongside the likes of
our fabled Recto, Mark I and Mark IV.
And finally we come to FLUID DRIVE, the highest gain of the 3 modes in Channel 2. This self-descrip-
tive mode adds yet another triode stage to the preamp, unleashing a single note voice of unprecedented liquidity. Notes flow out in a
river of harmonic complexity while retaining authority and depth, spread and focus. Here, the attack of the note is transformed into an
instantaneous symphony as it is morphing from an absolute bold event in time - to a spinning wheel of vowel sounds as the envelope
changes during decay in response to the rise and fall of input voltage generated by your picking technique.
All this preamp tone and flexibility is only half the story and magic though it is, the power section of the ACE plays an equal role in
making what we call a high performance amplifier. With the ACE you have options to tune the power to the sound you are searching
for and these choices point at crucial differences in power response that turn good tone into classic tone.
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
T
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E
T
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T
E
C
L
N
G
A
I
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INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
T
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T
E
T
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T
E
C
L
N
G
A
I
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PAGE 3
Overview: (Continued)
The ACE incorporates our patented switchable RECTIFIER ™ feature. This is a Channel
Assignable feature that appears as two toggle switches located on the Front Panel. These switches allow selection of a Rectifier style
- Tubes for a saggy, compressed feel or Silicon Diodes for tight, punchy response. This power-vibe flexibility allows you to zero in on
the sound as well as how that sound feels to play.
To further tune the power style, we’ve included our patented BOLD/SPONGY ™ switch. This useful feature allows you to choose
between the full 117 volts of incoming AC LINE voltage in BOLD or, use the SPONGY setting which acts as a built-in variac to knock
the incoming line voltage down to a brown-out like condition. This voltage difference also produces a dramatic difference in the way
a sound feels to play as well as accentuating different frequencies.
An Effects Loop BYPASS switch allows you to bypass the Loop and all associated circuitry (including the OUTPUT and SOLO Controls
which are part of the Loop Return stage) to produce a pure, unaltered signal path for studio work or any time you want the maximum
raw urgency of this shining tone blade. When you do choose to switch in the transparent Effects Loop, what little difference you might
notice is quickly forgotten with the usable power of the OUTPUT and SOLO Controls coming on line. The OUTPUT allows you to
adjust the overall level of both Channels with one knob, while the patented SOLO™ feature allows you to preset an additional output
level control and switch to it any time for a volume boost during live performances.
A SLAVE OUTPUT with level control is also provided to accommodate using the ACE as a master head in a large rack system
where it can be used to drive processing or additional power for large venues.
Two 4 Ohm and two 8 Ohm SPEAKER OUTPUT jacks enable you to match the impedance of most any cabinet configuration you
wish to use.
Now that we have a good idea of the features of your new ACE, let’s plug in and check out a quick demo setting to familiarize you
with the basic operation of the modes. You will find an expanded group of possibilities in the rear of this manual under SAMPLE SET
-
TINGS for your enjoyment at a later time.
INSTANT GRATIFICATION
Armed with a new perspective of just how incredible your new ACE really is, we can now take a closer look at each of the
controls and how they interact to produce your signature sound.
INSTANT GRATIFICATION
Ch1 Neck / Ch 2 Rear
Rear Humbucker
INSTANT GRATIFICATION
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
T
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PAGE 4
HELPFUL HINTS:
1.) The OUTPUT Control works only when the FX LOOP is activated. Switch out of the Loop Bypass position on the Loop Assign
switch to activate the FX Loop and bring the OUTPUT Control on line..
2.) The SOLO Control is activated when the Footswitch is connected to the FOOTSWITCH jack on the Rear Panel and the FX LOOP
is activated. When the footswitch is not connected the SOLO Control will have no effect on the volume level.
3.) When the FX LOOP is activated it is normal to hear the volume drop a bit. Use the SEND Level Control on the Rear Panel even
if no processor is patched in to bring the volume level back up to approximately unity gain.
4.) The SOLO Control can be set for a volume level above that of the OUTPUT Control setting. It will not allow a setting below that
of the OUTPUT.
5.) The GAIN and TREBLE are the most powerful controls in both channels. They should be used with taste and you will find that
the best sounds are found with these two controls set somewhere in their middle regions. Avoid setting the TREBLE above 2:00 when
the GAIN is maxed as the possibilities for noise and squealing from microphonic preamp tubes increases dramatically.
6.) Choosing the proper Rectifier mode with the RECTIFIER SELECT switch located on the Rear Panel that best suits the sound style
you are trying to dial can greatly enhance the performance. TUBE RECTIFIER produces a more elastic feel and softer clipping
characteristics which is especially great for single note soloing. SILICON DIODES produce more power and headroom and can
also track better for extreme gain settings while staying tighter in the bottom end.
7.) The PRESENCE Control determines a lot about the voicing of gain sounds. Set lower it will fatten and compress single note sounds
and lend a liquid feeling to the strings in Channel 2. Above 12:00 it starts adding cut and tightness in both channels.
Hopefully these tips have helped you in getting ready to enjoy a walk on the wild side and by now you should be getting pretty familiar
with your new ACE so lets move on to understanding and reviewing the rest of the features that are instrumental in helping to
shape your sound and tone.
FRONT PANEL: Controls & Features
The MODES: Channel 1
As mentioned in the Overview, each of the ACE’s two channels contain three modes of opera-
tion. These are laid out, in terms of their gain structure, such that as the mini toggle is switched down, the gain increases. The one
exception is in Channel 1, when in TITE CLEAN (middle position) gain in the bottom end is reduced.
Channel 1 is dedicated to a range of gain more suited to Rhythm playing with two modes that are lower
gain - aimed at clean chording, and one medium gain mode aimed at crunch rhythm styles.
FAT CLEAN (toggle up) walks the line between many of our previous clean circuits to produce a mode
that can be as versatile as it is vintage. It traces its lineage back to the best of the Black Face era and
pays tribute to the bloom and lushness of those American classics - while at the same time retaining the boldness, shimmer and
punch of the early Mark I Boogies.
These qualities, when combined with the classic EL34 top-end sting and mid attack found in some of the best Brit circuits, unveil a
clean mode that resonates with players of both camps and brings a new and exciting personality to the world of rhythm sounds. This
mode works extremely well for clean soloing with an emphasis on rich bass frequencies that fill-in and round-out notes in the higher
registers, giving even the B and E strings body and depth high up on the neck.
INPUT
FAT
CLEAN
CRUNCH
T
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T
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C
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PAGE 5
FRONT PANEL: Controls & Features (Continued)
The MODES: Channel 1 (Continued)
Because the voicing of this mode is heavy in these rich lows, it will be necessary at
times to reduce the setting of the BASS Control, especially when higher settings of the GAIN Control are to be used. Some amazing
clipped or pushed sounds are possible with the FAT CLEAN mode by cranking the GAIN and setting the BASS at 0 (7:00/off). Here, an
addicting smoothness is always present because the sub-low frequencies are allowed to pass freely and the entire spectrum warms
up and exudes soulfulness. Even when the BASS Control is used to trim away some of these lows, a fat smooth voice remains that
you will find useful for many applications.
TITE CLEAN (toggle in middle position) is the opposite in every sense. This mode is stripped of sub-lows and lower mids creating a
focused, immediate attack characteristic that can be described as unabashed forwardness. TITE CLEAN works great for chording
and parts played here will sit proudly and uniquely in a mix…even a complex one, because they require
little space to tell the story loud and clear.
When clipped, this mode behaves in a brash, urgent manner and with more bass frequencies trimmed
early on in the preamp, the BASS Control may be used to dial in tighter lows that compliment the top-end
perfectly. In fact, for clipped sounds in the Rhythm Channel, TITE CLEAN would almost always be the preferred choice. The balance
in all frequencies will result in the most cohesive distortion character, where the added gain stays more glued to the notes. Be sure to
check out using TITE CLEAN in combination with the BOLD/SPONGY switch set to SPONGY and the TUBE RECTIFIER selected
on the Rear Panel for some truly amazing power clip sounds.
CRUNCH (toggle down) is the ultimate in tight, urgent grind. The added gain in this mode, combined with immediate attack and a
brash attitude, makes this mode the old school Rock ‘N Roll dictionary of Brit inspired guitar sounds. This range of “medium gain” is
so versatile that you could use this mode alone for years, finding both great rhythm and solo sounds that
are accurate, articulate and expressive.
Because the CRUNCH mode is not as saturated, even at a maximum setting, as the two high gain
modes in Channel 2, it responds very well to adding additional gain by utilizing the switchable power
features. This mode spreads the perfect glazing of gain to give the right amount of attitude without covering up the natural character
of your guitar.
The inherent chirping harmonics are further enhanced by switching down to SPONGY which emphasizes top end shimmer while
scooping out a nice narrow slice of midrange. Choosing the TUBE RECTIFIER sags the power down even further and adds a creamy,
legato feel - making single note playing effortless, while removing any hint of harshness and elevates this mode to an incredible solo
voice.
The incredible expression and versatility of the CRUNCH mode prompted us to provide a duplicate of this sound among the choices
in Channel 2. After becoming familiar with the many uses for CRUNCH, you will quickly discover the value of being able to use it for
one of two scenarios; either two slight variations of this mode set for similar gain ranges (using the two individual MASTER Controls
for levels) or, vary the gain range and use one for rhythm and one for soloing.
However you wish to dedicate your Channels, you will likely find CRUNCH to be one of the most important and essential modes in
your ACE.
Now that we have reviewed the modes in Channel 1 and understand the voicings, let’s move down to Channel 2 and get to know the
modes in your ACE dedicated to higher gain soloing.
INPUT
FAT
CLEAN
CRUNCH
T
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C
L
N
INPUT
FAT
CLEAN
CRUNCH
T
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C
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PAGE 6
FRONT PANEL: Controls & Features (Continued)
The MODES: Channel 2
CRUNCH: See the description of this mode under Channel 1 as it is duplicated here in Channel 2. Don’t underestimate this mode
for its soloing potential. Despite the lower gain range, it has virtues for lead work the other higher gain
modes are missing due to their more saturated character.
TITE GAIN (toggle in middle position) takes the classic EQ curve of CRUNCH with its bold, forward mid attack and chirping, articulate
top and kicks the gain up several notches to create the ultimate high gain lead sound with an unmistakable Brit character. Adding com-
pression and sustain to an already classic sound, the extra gain allows TITE GAIN to sing with conviction
and authority and yet it still retains all the articulation and accuracy of its lower gain cousin CRUNCH. For
those who have grown up on classic British circuits or rely on them for a large part of their style, TITE
GAIN is a single note tone fantasy that will elevate your soloing to new heights. The less resistant feel
on the strings will have you burning…smashing your previous metronome boundaries with an effortless
flow and sense of confidence you have likely never experienced.
For de-tuned moshing there may be no equal to TITE GAIN (except of course for our Dual and Triple Rectifier Solo Heads ).
TITE GAIN is tailor made to keep the low frequencies in line and tracking tight. The obvious mid range focus and lack of sub-lows here
ensures that your de-tuned groves will cut with a ferocious intensity and stop on a dime when you cut off the notes. Tight, searing, and
honed to a glistening stainless polish, the ACE’s TITE GAIN is the ultimate blade in the world of modern hyper-gain rock.
FLUID-DRIVE™ oozes with smoldering, layered harmonics and represents the highest gain mode in your new ACE. Its namesake
pays tribute to the type of playing that it shines for, and like TITE GAIN, it will have you breaking all tempo barriers in no time with its
consistent string resistance and easy-to-play-feel across the entire range of the instrument.
Compressed and fat, smooth and vocal, FLUID-DRIVE is the ultimate voice for memorable melody lines
or liquid lead lines that drip with soul. This is often the perfect compliment to other guitarists in the band
or for when you need your lines to have added girth. No British circuit has ever come close to delivering
a solo sound with this depth, breadth or intensity through a power section driving the EL34, and this
catapults the genre into a new realm of single note solo mastery.
For high gain chording or rhythm work, FLUID-DRIVE can produce a wall of layered harmonics that can grind with the best of the
ACE’s vintage sounds and is definitely worth auditioning for thicker rhythm parts. You will want to dial these two regions more
carefully and possibly lean a little harder on the TREBLE and MID to achieve the best balance and retain the tightest attack.
Hopefully the descriptions of the Modes and their possible applications have given you some insight as to how to configure your
Channels to give you the greatest flexibility. Now let’s move to the rest of the Front Panel and check out the controls and switches.
FT.SW
CRUNCH
FLUID
DRIVE
T
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G
A
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N
FT.SW
CRUNCH
FLUID
DRIVE
T
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E
G
A
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N
FT.SW
CRUNCH
FLUID
DRIVE
T
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G
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PAGE 7
FRONT PANEL: Controls & Features (Continued)
While you have most likely taken your new ACE for an inspiring spin around the world of high performance EL34 tone, we encourage
you to read through the Control section to learn how these interactive controls can shape your dream tone. Many hours were spent
making sure they are powerful, musical and that they will deliver all the shaping power you’ll ever need to craft a signature sound all
your own.
GAIN:
This control adjusts the predominant gain stage in each channels’ circuit with the function and taper being optimized for
each individual channel. Remember that your ACE is really two separate multi-mode amplifiers built onto one chassis, so though
each channel looks identical, the GAIN Control for each channel comes in a different place
and adjusts a different point in that channels circuit.
In most guitar amplifiers, and especially in all-tube circuits, the GAIN Control is the most
powerful control in the preamp. It shapes the overall style and character of the sound and is
responsible for whether the sound is clean, overdriven or anywhere in between.
In your ACE, the GAIN Control is even more powerful. It not only determines the amount of
drive, but also acts as an integral part of the tone control string as well.
1) The GAIN Control has basically three tonal regions -
Low (7:00 - 11:00) provides the cleanest, least saturated sounds and in this region the sound will be brighter and contain more upper
harmonics lending a three dimensional character to the sound.
Middle (11:15 - 2:00) enhances the saturation and replaces some of the upper harmonics with a richer, warmer quality and a fuller
bottom end response. Not yet fully saturated, this region is the easiest place to get a great sound in both channels. This region
contains many of the ACE’s best sounds...especially for soloing due to the crucial blend of an expressive attack combined with
ample sustain.
High (2:15 - 5:00) saturates the signal and enhances low and low mid frequencies. While this region provides the maximum satura-
tion and therefor sustain, it also compresses and softens the attack characteristics.
NOTE: Due to the ACE’s extreme gain potential, the highest regions of the GAIN Control may possibly push the pre-amp tubes
past what they can handle, producing microphonic squealing. While we screen and test the tubes your amplifier was shipped with
and the tubes in your amp passed our rigourous test, we can’t predict how the tubes will respond over time exposed to extreme
gain settings. Your tubes are warranted for a period of 6 months under normal use, but you can save yourself the present and future
inconvenience of having to deal with annoying microphonic tube problems by simply using a little common sense...Don’t turn the
Gain all the way up with the Tone Controls at their maximum settings!
If you must for a specific part or at very low volumes, back down the TREBLE and PRESENCE Controls. Your ACE was designed
to provide amazing gain and tone at less than extreme settings removing the need for you to crank everything all the way up. If you
are not able to achieve the sound you want at sensible settings on any or all of the controls, your problem may lie elsewhere in the
signal chain, i.e. pick-ups, cabinetry, processing etc. Keep in mind you can always call on one of our product specialist Monday through
Thursday and seek some advice should you find yourself struggling to get the sound you want.
2.) GAIN - In conjunction with the Tone Controls - Basically, a simple rule applies...as the Gain is increased the Tone control string
has less and less effect on the signal until at 5:00 the signal is so saturated that you are getting mostly Gain and very little Tone. Again,
this is the reason we suggest using the GAIN Control in its middle region. Here the Tone control string is very active and provides
maximum shaping power - allowing you to dial virtually any sound you desire.
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
T
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T
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C
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G
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PAGE 8
FRONT PANEL: Controls & Features (Continued)
TREBLE:
As in most tube guitar amplifiers, the TREBLE Control (in both channels of your ACE ) is the most powerful of the
rotary controls and is next in line only to the GAIN Control as a shaping tool. Because it is first in the signal path of the tone controls
- and from here the Middle and Bass receive their signal - it is by far the dominant tone control. For this reason the setting of the
TREBLE Control is very important for equal representation of the three frequency regions to appear at their respective controls. Like
most of the controls on your ACE, there is an optimum region of the TREBLE
Control where ample top end is mixed in and yet enough signal is still passed on to
the MIDDLE and BASS Controls.
As you might surmise, here is the sweet spot. There are definitely great sounds
above and below this middle region (11:00 - 1:30), but the balance between the
TREBLE Control and the other two tone controls is compromised.
The one place you may want to throw caution to the wind and set the TREBLE Control
above this median zone presents itself in Channel 1. In CRUNCH, the TREBLE Control can be used to dump extra gain into the mix.
This is especially effective for crunch sounds. When doing so, use the PRESENCE Control to roll off some of the more than ample
top end for a more compressed feel and fatter voice. As you might surmise, the BASS Controls’ effectiveness will be reduced, so you
may have to run a much higher setting than you are used to seeing to achieve a balance. This said, keep in mind that the TREBLE
Control in Channel 1 CRUNCH should not be set much above 2:30 to avoid unwanted microphonic tube problems.
MID:
The MID Control is responsible for the blend of midrange frequencies in the mix and though its effect is not as dramatic as
that of the TREBLE Control, it plays an integral part in achieving any sound in your ACE. It is capable of changing the feel dramati-
cally as it blends in a group of frequencies that tend to soften or stiffen the way a sound feels to play.
Many players tend to lean in the direction of lower MIDDLE Control settings (7:00 - 11:00) where a
scoop in this region produces girth (by letting the Bass become a little more dominant) and a lack of
punch lends a more compressed, even feel to the strings and therefore less apparent resistance to
the pick. As the MIDDLE Control is increased, (11:30 - 1:30) the sound is rounded-out and filled-in
with a focused mid attack appearing rather quickly. As you would guess, the feel starts to change
- becoming more resistant. Above this region the MIDDLE Control could be used to compensate for
either weaker pick-ups or for times when a specific deficiency is produced by either an extremely
high setting of other tone controls, or a physical anomaly in the room. While these MIDDLE Control
settings (2:00 - 5:00) can introduce added gain and create enhanced focus, the trade-off will be a
stiffer, more forward, less compressed feel.
BASS:
Last, but not least in the string of tone controls we come to the BASS . This control works similarly in both channels in
that it determines the amount of low frequencies present in a sound. However, the actual frequencies and style of lows it mixes in
changes from channel to channel and within the different modes. Like the MIDDLE Control, it falls in line signal-wise after the TREBLE
Control and the same scheme applies. When the TREBLE Control is set high, the effectiveness of the BASS and MIDDLE Controls
is reduced. If the TREBLE Control is set low these two controls become dominant.
For the most balanced sound and a balance of power between the three rotary tone controls, try to
use the TREBLE Control in its middle ranges. This scenario produces nearly equal representation
of all the frequencies on the tone controls and provides a great neutral starting point for further
tweaking.
GAINTREBLE
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N
GAINMID TREBLE
BASS
TREBLE
MID

PAGE 9
FRONT PANEL: Controls & Features (Continued)
PRESENCE:
The PRESENCE Control is a high frequency attentuator that is placed at the end of each channels pre-amp stage
and affects frequencies higher than those of the TREBLE Control. It acts independently of the other rotary tone controls and is cru-
cial in voicing the channel. It is a powerful global tone control. Lower PRESENCE Control settings darken and, in fact compress the
signal which works well to fatten single note solo sounds, giving them girth and focus. Some of
the best lead sounds in your ACE will find the PRESENCE Control in its lower regions, where
a balanced, vocal response is achieved.
Higher settings unleash the mighty roar of your ACE and this can be great for sparkling clean
sounds in Channel 1 and more aggressive crunch rhythm sounds in the high gain modes. Be sure
to taunt the beast that lurks in the CRUNCH mode of Channels 1 and 2 as the PRESENCE is
truly amazing in this most agro mode.
MASTER:
This control is the master feed from the end of the pre-amp to the driver stage and the Effects Loop. As you can see
each Channel is fitted with its own MASTER Control, enabling the channels relative volumes to be matched regardless of their ex-
tremely different sound styles and gain signatures. The MASTER Control makes possible a wide range of sounds through its ability
to use very low Gain sounds at high volumes and conversely, high Gain sounds at low volumes and everywhere between.
Again, we suggest using the MASTER Control in its sensible ranges (9:00 - 2:00). Here, the chan-
nels will be easier to match with each other and the Effects Loop will see more reasonable signal
levels.
NOTE: Because the MASTER Control creates the send to the Effects Loop, extreme settings
will cause a large signal to be sent to the Loop for that Channel. Not only may this cause possible
overloading of the processors Input stage, but will make balancing the two channels’ Effect Send
level difficult.
These channel specific switches determine the type of rectification the power section
of your ACE will operate on. The choices are the solid state SILICON DIODES which convert the A.C. to D.C. with a constant stiffer,
tighter character or, TUBE RECTIFIER which brings online a 5U4 rectifier tube for a saggy, compressed power
feel. This patented switchable choice of rectification is at the heart of being able to nail the sounds we all hear
as classics and imparts a feel on the strings like no other element in a guitar amplifier. Tube rectification is
especially important when trying to dial-in vintage type sounds where - in the era before MESA introduced
the world to the high gain preamp, power clip characteristics were the only way to get a heavier sound. As
the power section tries to draw more current at higher volumes, the tube rectifiers begin to sag and compress
the sound while scooping the harder midrange frequencies, creating an ultra expressive power signature.
Solid state rectifiers do the opposite and deliver a steady, stiff supply of current - enabling the power section
to crank out its rated wattage with immediate response and tight authority.
TUBE RECTIFIER would likely be the choice for single note soloing where each note morphs through the vowel sounds as the dynamic
content changes from attack to decay. The SILICON DIODES will keep bass frequencies tight and track better at extreme preamp
gain settings, especially when detuned or at higher volumes, and emphasize attack and urgency.
The Switchable Rectifier feature is a huge part of the success of our entire Dual Rectifier line and has elevated them to their cur-
rent status as iconic classics.
PRESENCE BASS MID
MASTER PRESENCE BASS
RECTIFIER SELECT: Diodes / Tube Rectifier
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2

PAGE 10
CHANNEL SELECT:
This 3 position switch - located in the center line of the chassis between the two channels - is responsible
for selecting the desired channel when the ACE Footswitch is not being used. This comes in handy in the studio where you may wish
to use the head in the control room with the cabinet isolated and select the channels for overdub
parts, or any time the footswitch is not needed for performance.
To use the Footswitch, set the mini toggle in the center position - labeled FTSW - and connect the
standard stereo cable to the FOOTSWITCH jack on the far right of the Front Panel. Selecting one
of the Channels with the Channel Select toggle when the Footswitch is connected will override the
Footswitch.
OUTPUT CONTROL:
This control determines the overall output volume level of the amplifier. After the GAIN Controls have
been set for the desired sound style and the two channels levels have been balanced with the channel MASTER Controls, the OUT-
PUT Control allows you to change the playing level by adjusting a single control. The OUTPUT Control is also wired as the Effects
Loop Return Level Control. Should you ever use your ACE amplifier as a power amp
alone by inserting a signal into the RETURN jack, the OUTPUT Control will serve as the
master level control.
NOTE: When using the EFFECTS RETURN as an input - to use the ACE amplifier
as a power amp - the SOLO Control can be used to attain a footswitchable boost if the
Footswitch is connected. It is wired in parallel to the OUTPUT Control and therefore
controls the volume of the power section as well.
NOTE: The Effects Loop RETURN jack can serve as a power amp input so that you
may use the ACE’s amplifier as a power amp for either stereo reproduction or to incorporate additional pre-amps. Here are a few
things to remember that will help you when interfacing to the ACE for use as a power amp only;
1.) The LOOP IN / HARD BYPASS switch must be set to LOOP IN.
2.) The OUTPUT Level will be the only active control on the Front Panel (the PRESENCE Control of Channel 1 will be active only
when that channel is engaged).
3.) The SOLO Control may be used to footswitch to a pre-determined amount of boost when the footswitch is connected.
SOLO CONTROL:
This control can only be activated if the correct Footswitch is connected to the Footswitch jack.
SOLO is an additional final output level control wired in parallel with the OUTPUT Control. It is capable of a setting above that of the
OUTPUT Control and can not be set below. The amount of apparent boost also depends on that of the OUTPUT Control - in that if
the amplifier is at either the extreme low or extreme high levels of the OUTPUT, its effectiveness is minimized. It has been optimized
for live performance volume levels.
If the power section is either not a part of the sound (super quiet), or producing all its
rated wattage (super loud), there is very little signal for the SOLO Control to work with. By
using the Footswitch and selecting SOLO, a pre-settable boost in overall level is possible
on the fly...giving you some control over your level when it’s time to step out. Engineers
may give you a bit of a frown the first time you use it...but isn’t it time you heard yourself.
It might even prevent them from punishing you with the dreaded monitor or sidefill ver-
sion of your tone.
OUTPUT
SOLO
OUTPUT
SOLO
FRONT PANEL: Controls & Features (Continued)
MASTER PRES
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2

PAGE 11
STANDBY:
Perfect for set breaks... this toggle switch also serves an even more important purpose. In the Standby position
the tubes are at idle so that during power up they may warm up before being put to use. Before Power is switched on make sure the
STANDBY switch is in the Standby position.
Wait at least 30 seconds and then flip the STANDBY switch to the ON position. This prevents tube problems
and increases their toneful life substantially.
This sideways 3 position toggle switch determines the status of the incoming AC power.
“SPONGY” works like a built in Variac, reducing all the internal voltages for a true vintage feeling and that extraordinary “brown
sound.” Power is reduced somewhat too, making it easier to achieve an overdriven power sound,
especially when the RECTIFIER SELECT switch is set to the TUBE RECTIFIER position.
Using the ACE in the SPONGY power setting will also extend tube life and overall reliability, while
still producing enough power to work many of your gigs...and all of your recording needs! For maxi-
mum power, normal response and the greatest headroom use the ON setting of the AC power switch.
Make sure the unit is grounded (all three terminals of the A.C. power cord must be connected when-
ever possible to avoid injury to the user as well as to the unit) and that the proper voltage is present.
Follow the cold start procedure described in the ON / STANDBY section above when powering up your new ACE.
Now that we’ve covered the Front Panel Controls & Features, let’s spin around to the back side and go through the features that call
the Rear Panel home as there is more valuable and intuitive shaping power available there.
SLAVE:
This 1/4” jack and its associated LEVEL Control capture the entire sound of the amplifier, both preamp and power sec-
tion, and give you an adjustable signal you can use for feeding outboard processing and/or additional power amplifiers. This signal is
derived from the speaker output and is then padded down to provide a usable range that will be appropriate for either the input stage
of a processor or the input of an external power amp.
The SLAVE output is not like the effects loop - in that once a signal has been taken from the SLAVE, it can not
be returned to the ACE RETURN jack or Input. Doing so will result in a feedback loop which will produce a
high pitch squeal much like a microphone held to a monitor.
Because the ACE is a high performance concert-ready head, this output is provided as a one-way-send,
intended for feeding large outboard rack systems which in turn feed additional tube power amplifiers. In this scenario, the ACE
would be a “dry” master head (tone generator) and this sound would then be fed via the SLAVE output - to a rack of processing, then
that signal would likely be split into stereo and fed to one or more stereo amplifiers for amplification of the separate “wet” sound. This
scheme, while cumbersome and expensive, ensures the best big venue tone, as it preserves the original master heads’ sound and
SPONGY
ON
STDBY
ON
POWER
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
FRONT PANEL: Controls & Features (Continued)
REAR PANEL: Controls & Features
LEVEL OUT
SLAVE
POWER: ON / OFF / SPONGY

PAGE 12
REAR PANEL: Controls & Features (Continued)
SLAVE: (Continued) gives you separate control over the wet sound in a parallel world. This separate treatment of the processed
sound mimics having separate channels of processing on playback in a recording console and is the ultimate way to make sure there
are no compromises in your live tone.
NOTE: While you can use almost anything as additional slave amplifiers, may we humbly suggest that using another ACE for mono
enhancement or, one of our dedicated rack mount all-tube stereo power amplifiers for stereo rigs - will preserve and in fact enhance
the original ACE dry signal. (Call us and ask to speak with a Product Specialist who can advise you as to which stereo model would
best suit your needs). We have designed these stand alone power amplifiers to deliver ultimate Tone, might and portability and when
combined with your ACE, they will create a dream rig of mind-bending performance.
SPEAKER:
These are the Speaker Outputs for connecting your cabinet(s) of choice. Your ACE is not very sensitive to imped-
ance mismatching and therefore we encourage experimentation with regards to speaker loads. You may feel free to try an 8 Ohm
load on the 4 Ohm jack or a 16 Ohm load on the 8 Ohm jack as you may discover a characteristic that the mismatched load imparts
on the sound that is desirable.
MESA 4x12 cabinets are wired in Series/Parallel and are rated at 8 Ohms and these should
normally be connected to the 8 Ohm jack. When using two MESA 8 Ohm 4x12 cabinets, con-
nect them each to a 4 Ohm jack as doubling the load on each jack produces a total load of 8
Ohms and is a proper impedance match.
Feel free to use speaker cabinets built by other manufacturers (at least until such time you can
check out a MESA cabinet) and these are often wired to produce a 16 Ohm load which you
would want to connect to the 8 Ohm jack. Two 16 Ohm cabinets would be connected each to
an 8 Ohm jack. Overall your ACE is very impedance friendly and most speaker loads will work great with the exception of slightly
shorter power tube life occurring when a mismatch in the low direction (two 4 Ohm cabs - each in a 4 Ohm jack to produce a total
load of 2 Ohms) is used for long periods of time.
These jacks provide an external trigger port for the Channel Select and SOLO
functions. They may be connected to an external master controller (usually MIDI programmable) so that one command can control
all footswitchable functions on your ACE, along with any midi program change commands sent to your outboard processors. This
is a great feature that will allow you to avoid the dreaded pedal board dance.
The EXTERNAL SWITCH jacks respond to latching type logic where the “tip” is shorted to the “ring” or ground.
This is also referred to as tip-to-ground logic and is the most common type of switching logic used in tube
musical instrument amplifiers. Simply connect a standard unshielded 1/4” cable to the ACE EXTERNAL
SWITCH jacks and connect these to a latching tip-to-ground port on the master switching device. Refer to the
master switcher’s manual as to how to control and store the function jacks under a program.
FX LOOP:
Your ACE is fitted with a Series Effects Loop for interfacing outboard processing. The Loop is placed at the junction
between the preamp and the power amp and is optimized for levels that will match up with most good quality processing devices.
A SEND LEVEL Control is provided to fine tune the signal strength coming from the preamp and allows for some compensation for
extreme Channel MASTER settings. As mentioned earlier, the Front Panel OUTPUT (and SOLO) Control is part of the Effects Loop
Return stage and therefore these are not active when the Loop is switched out of the circuit.
As you have probably noticed, the Loop may be switched out of the signal path completely using the LOOP IN/HARD BYPASS switch
CHANNEL SOLO
EXT
SW
STILETTO
AC E ®
CHANNEL & SOLO: External Switch Ports
4 OHM 4 OHM 8 OHM 8 OHM
SPEAKER

PAGE 13
located adjacent to the loop. This switch engages the Loop SEND and RETURN jacks, SEND LEVEL
Control, OUTPUT and SOLO Control and all associated circuitry. When LOOP BYPASS is selected (switch down) the entire Loop is
removed from the signal path and the individual Channel MASTER Controls become your final output level controls. This HARD BYPASS
feature allows you to use your ACE in all its raw glory in the studio where processing will
be added later on a separate channel and you need every ounce of pure, unfiltered, Tone
for a magical performance.
To use the FX LOOP, start by using premium quality shielded cables of the shortest possible
length (preferably no more than 3 feet).
1) Connect the SEND to your processor’s INPUT.
2) Connect the RETURN to your processor’s OUTPUT.
3) Set the two Channels to your dedicated sounds and levels using the Channel MASTER Controls.
4) Select LOOP IN on the LOOP Select switch.
5) Set your processor’s INPUT Level control for unity gain.
6) After playing in the two channels, Adjust the Rear Panel SEND LEVEL to achieve a good unity gain peak level (remember that
clean sounds will peak a bit higher because of their more dynamic, less compressed nature).
7) Adjust the Front Panel OUTPUT Control to the desired playing volume.
8) Connect the Footswitch (to the Front Panel FOOTSWITCH jack, select SOLO and adjust the SOLO Control for the desired amount
of volume boost.
You will find the FX LOOP a welcome feature for all rack type processing and when good quality cables are used and kept to a length
of 3 feet or less, you will notice very little if any degradation in the sound of your ACE.
NOTE: Because the FX LOOP is wired in series with the main signal, it is very important that you choose processing devices that
are of professional grade quality from reputable manufacturers. In a series configuration, your amplifiers sound will depend on the
integrity of the processor’s input and output stages, because you have inserted something into the heart of the most sensitive place
in your amplifier.
USING THE FX RETURN AS A POWER AMP INPUT:
You may, at times, wish to use the ACE as a stand alone power
amp for amplification of processing or as half of a larger stereo rig. Because of the channel and mode specific changes that take place
internally you will want to follow the suggestions below for the best results.
1) The FX LOOP SELECT switch must be set to LOOP IN (Loop engaged).
2) The FX LOOP RETURN jack is the INPUT to the power section. This jack bypasses the entire preamp including the GAIN and all
the Tone Controls.
3) The OUTPUT is your level control.
RETURN SEND
SEND LEVEL
FX LOOP
LOOP IN
HARD BYPASS
ALL TUBE
AMPLIFIER
®
REAR PANEL: Controls & Features (Continued)
FX LOOP: (Continued)

PAGE 14
4) You may use the SOLO Control for a footswitchable volume boost (Footswitch must be connected).
5) You may use the Front Panel POWER SELECT switches to select a power rating that is appropriate for the venue or application.
6) The choice of rectifiers is still available when using the ACE FX RETURN as a power input. Remember that this choice is channel
specific. The SILICON DIODE selection is more in line with what you would find in most all other stand alone power amplifiers, but for
guitar applications it is nice to have the choice of the saggy response of tube rectification.
AC RECEPTACLE:
The removable “Euro” Style” A.C. cord that is supplied with your new ACE makes set-ups and tear-downs
after the gig a snap. It also makes de-racking much easier when you wish to remove the unit from a hard wired rack system where all
the A.C. cords have been cable-tied in. Additional heavy duty cords are available should you ever need one...
simply call us direct and we can ship one directly to you for a nominal charge, plus shipping cost. Make sure
the A.C. cord is firmly seated in the A.C. RECEPTACLE found on the tube side of the chassis before powering
up the amplifier.
NOTE: Never alter the three prong power cord in any way.
FUSE:
This is the A.C.’s (Alternating Current) main fuse and provides protection from outside A.C. fluctuations as well as power
tube failure damage. Should the Fuse blow, replace it with the same rating in a Slo-Blo type package. The domestic U.S. version
requires a 3 amp Slo-Blo fuse. A power tube short or failure is often the cause of a blown fuse...Follow the
cold start procedure mentioned in the ON/STANDBY switch section and watch the power tubes as you flip
the STANDBY to the ON position. If a power tube is going bad or is arcing you will see it! Flip the STANDBY
switch to Standby immediately and replace the faulty power tube and the fuse if necessary.
If you see nothing abnormal as you lift the STANDBY switch, it is possible that a power tube shorted temporarily
and blew the Fuse. If this is the case it may work again normally. To be safe, you might want to replace it and
just the adjacent tube or all power tubes in the “shotgun” troubleshooting tradition and save the replaced set as spares. Spare fuses are
a must for the fabled cord bag along with your spare tubes. Always carry both for they could be worth their weight in gold someday.
SERIAL NUMBER: The Serial Number of your amplifier is printed on a small metal tag attached to the tube side of the chassis
near the 5U4 Rectifier Tube (see pg 33 for reference). You’ll need this number when filling in your warranty registration card.
That covers the features and functions on the Rear Panel and by now you should be ready to start crafting your dream Tone. If you
would like some examples of ways to set the modes in your ACE for different applications, you may find the following SAMPLE
SETTINGS helpful.
We wish you a lifetime of amazing and inspirational Tone from your new musical instrument and our hope is that it takes you to new
and exciting places on your musical journey.
WARNING: Unplug power
before replacing fuse or
removing bolts mounting
chassis
POWER FUSE
120 V~
60 Hz
3 A
3 A
SLO
BLO
F
U
S
E
REAR PANEL: Controls & Features (Continued)
USING THE FX RETURN AS A POWER AMP INPUT: (Cont.)
WARNING: Unplug power
before replacing fuse or
removing bolts mounting
chassis
POWER FUSE
120 V~
60 Hz
3 A
3 A
SLO
BLO
F
U
S
E
A.C. Receptacle

PAGE 15
NOTES:
REST AREA

PAGE 16
FACTORY SAMPLE SETTINGS
SAMPLE #1. Skinny Clean / Grinding Tight Crunch Clean Ch 1
Diodes
Ch 2
Diodes
SAMPLE #2 Big Clean / Bigger Lead Ch 1 Diodes Ch 2 Tube Rectifier
SAMPLE #3 Brown Crunch / Vintage Lead Ch 1 Tube Rectifier Ch 2 Tube Rectifier
SAMPLE #4 Brit Crunch / Mod. Lead Ch 1 Diodes Ch 2 Diodes
SAMPLE #5 Flat Out Ch 1 Diodes Ch 2 Diodes
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N
INPUT
FT.SW
FAT
CLEAN
CRUNCH
FLUID
DRIVE
CRUNCH
GAIN
TREBLEMID
BASS
PRESENCE
MASTER
DIODE
TUBE
DIODE
TUBE
FT
SW
CH 1
CH 2
OUTPUT
SOLO
SPONGY
ON
STDBY
ON
POWER
OFF
T
I
T
E
T
I
T
E
C
L
N
G
A
I
N