Owner`s manual
Each Channel is fitted with a mini-toggle just to the left of the SLIDERS to select the operational status of the 5-Band Graphic EQ
and the FIVE: 25 gives you two ways to utilize its shaping power.
In each Channel you can decide which of three ways you want to apply the EQ:
EQ ON (toggle up) - EQ ACTIVE all the time in that Channel
O (toggle center) - BYPASSED all the time in that Channel
EQ FS (toggle down) - CONTROLLED BY THE EQ BUTTON ON THE FOOTSWITCH
There is also an Orange LED in between the EQ Control toggle switches to keep you apprised of the EQ STATUS. This LED ILLU-
MINATES WHEN THE EQ IS ACTIVE, regardless of how it has been engaged.
NOTE: Avoid using the 80Hz and 240Hz SLIDERS at their maximum boosted setting in combination with very high GAIN and BASS
settings. This will not only cause an unbalanced, tubby sound (bad sound), but also possibly stress loudspeakers, especially Studio
Monitors when the CABCLONE Feature is in use and the amplifier is feeding a Console, Preamp or Recorder.
NOTE: Avoid using the 2200KHz and 6600KHz SLIDERS at their maximum boosted settings in combination with high GAIN, TREBLE
and/or PRESENCE settings. This may increase the likelihood of any tube that might have microphonic tendencies to start producing
ringing or squealing due to excess top end. If this occurs simply back down one or more of the above preamp Controls or EQ SLIDER
Bands or both, and the ringing should subside.
NOTE: Repeated Here For Awareness: Like a powerful car with a high horsepower motor can produce speeds beyond the capabilities
of certain tires, the MARK FIVE: 25 can produce gain beyond the capabilities of certain preamp tubes. While the tubes in you amp
passed our rigorous testing at the time of production, tubes can wear and change over time and become more prone to microphonics.
Using common sense and a little “tasteful restraint” with these powerful Controls will greatly minimize your exposure to microphonic
tube issues.
MULTI-WATT™ CHANNEL-ASSIGNABLE POWER
Located just to the right of the Graphic EQ SLIDERS are the Channel-
Assignable MULTI-WATT™ Power Select switches. Each Channel here in the MARK FIVE: 25 allows you to choose either 25 Watts
of our exclusive Dyna-Watt™ Class AB Pentode wired power or 10 Watts of Class AB Triode power, enabling you to match
the power output, the feel and the amount of natural power clip (drive) to each of your foot switchable preamp sounds.
The 25 W setting (switch up) brings on-line our patented Dyna-Watt™ Class AB Pentode style wiring for the full power
and headroom. This setting is preferred for pristine clean sounds and tight-tracking high gain sounds as it delivers a burst
of power and headroom far beyond the expectation of its rated power. This ingenious and unique MESA circuit stores up
voltage in the power section and releases it at the instant of attack—when you need it most—then instantaneously sags
down to a more “normal” voltage at a time-specific rate. Then it recovers in time to do it all over again for the attack of your
next note or chord. This instant burst, sag and re-charge translates into a bouncy, dynamic sound and an amazing, precise, yet elastic
feel on the strings. Pure tube magic!
The 10 W position (switch down) rewires the EL84 output tubes to Class AB Triode style wiring for a more vintage-voiced and oh-so-clip-
able low power character. This produces less output, a smoother voice that clips with softer attack characteristics and a creamier feel.
This once-patented, now exclusive MESA circuit has been appreciated by players around the world for decades and has furthered
the reputation that Boogie’s were the “little amp that could” since its introduction in the now-classic Studio 22 Combo back in 1984.
Now combined with the incredible versatility of the MARK FIVE: 25’s two Channel preamp and 6 distinctive Modes, that reputation is
safe and secure for future generations to enjoy.
PAGE 23
CLEAN
CRUNCH
FS
MK IIC+
MK
IV
XTREME
GAIN TREBLE
MID BOOST
MID PRESENCE MASTERBASS
EQ ON
EQ
O
O
EQ FS
SPKR
ON
CLOSED
BACK
OPEN
BACK
CabClone™
D.I.
SPKR
OFF
LIFT
GROUND
EQ ON
EQ FS
CAUTION: Unplug
power before
servicing
120 V~
60 Hz
1 A
1.25 A
SLO
BLO
AMPLIFIER
44YV
HEADPHONERETURNSEND
4 OHM 8 OHM
4 OHM
REVERB
CH 2 CH 1
MARK FIVE: 25™
VACUUM TUBE
AMPLIFIER
HANDCRAFTED
IN PETALUMA,
CALIFORNIA
80Hz
240 750 2200 6600
25 W
10 W
25 W
10 W
TUBE GUIDE
6 x 12AX7
2 x EL 84
PATENTED
7,602,927
(USE WITH TWO 8 OHM SPKRS)
FX
SPEAKERS
INPUT
FT SW
POWER
STANDBY
MARK
5
TWENTY-FIVE
™
CLEAN
CRUNCH
FS
MK IIC+
MK
IV
XTREME
GAIN TREBLE
MID BOOST
MID PRESENCE MASTERBASS
EQ ON
EQ
O
O
EQ FS
SPKR
ON
CLOSED
BACK
OPEN
BACK
CabClone™
D.I.
SPKR
OFF
LIFT
GROUND
EQ ON
EQ FS
CAUTION: Unplug
power before
servicing
120 V~
60 Hz
1 A
1.25 A
SLO
BLO
AMPLIFIER
44YV
HEADPHONERETURNSEND
4 OHM 8 OHM
4 OHM
REVERB
CH 2 CH 1
MARK FIVE: 25™
VACUUM TUBE
AMPLIFIER
HANDCRAFTED
IN PETALUMA,
CALIFORNIA
80Hz 240 750 2200
6600
25 W
10 W
25 W
10 W
TUBE GUIDE
6 x 12AX7
2 x EL 84
PATENTED
7,602,927
(USE WITH TWO 8 OHM SPKRS)
FX
SPEAKERS
INPUT
FT SW
POWER
STANDBY
MARK
5
TWENTY-FIVE
™